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Shizhong Wang
School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510006, China

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Journal article
Published: 08 December 2020 in Water Research
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Biocrust-mediated in situ bioremediation could be an alternative strategy to mitigate metal(loid) pollution in aquatic habitats. To better understand the roles of biocrusts in regulating the fate of metal(loid)s, we examined the morphology, composition and structure of biological aqua crusts (BAC) developed in the mine drainage of a representative Pb/Zn tailing pond, and tested their effectiveness for immobilizing typical metal(loid)s. Unlike terrestrial biocrusts, BAC results from an assembly of compounds produced by the strong microbial activity and mineral compounds present in the aquatic environment. The BAC exhibited a unique flexible, spongy and porous structure with a specific surface area of 12-22 m2 g−1, and was able to effectively concentrate various metal(loid)s (e.g. Cd, 0.26-0.60 g kg−1; Pb, 0.52-0.66 g kg−1; As, 10.4-24.3 g kg−1). The concentrations of metal(loid)s (e.g. Cd and As) in the BAC were even three to seven times higher than those in the source tailings, and more than 98% of immobilized metal(loid)s were present as the highly stable non-EDTA-exchangeable fraction. Adsorption on the well distributed micro-particles of the clay minerals (e.g. kaolinite) and the organic matters (2.0-2.7 wt.%) were found to be the major mechanisms for BAC to bind metal cations, whereas adsorption and coprecipitation on Fe/Mn oxide (e.g. FeOOH), was proposed to be the dominant pathway for accumulating metal(loid)s, especially As. The decrease in aqueous concentrations of the metal(loid)s along the drainage could be attributed in part to the scavenging effects of the BAC. These findings therefore provide new insights into the possible and efficient strategy for metal(loid) removal from water bodies, and highlighted the important role of BAC as a nature-based solution to benefit the bioremediation of mining area.

ACS Style

Guobao Wang; Yongqiang Yuan; Jean Louis Morel; Zekai Feng; Daijie Chen; Chunfeng Lu; Meina Guo; Chong Liu; Shizhong Wang; Yuanqing Chao; Yetao Tang; Dongye Zhao; Shi Xiao; Weixian Zhang; Rongliang Qiu. Biological aqua crust mitigates metal(loid) pollution and the underlying immobilization mechanisms. Water Research 2020, 190, 116736 .

AMA Style

Guobao Wang, Yongqiang Yuan, Jean Louis Morel, Zekai Feng, Daijie Chen, Chunfeng Lu, Meina Guo, Chong Liu, Shizhong Wang, Yuanqing Chao, Yetao Tang, Dongye Zhao, Shi Xiao, Weixian Zhang, Rongliang Qiu. Biological aqua crust mitigates metal(loid) pollution and the underlying immobilization mechanisms. Water Research. 2020; 190 ():116736.

Chicago/Turabian Style

Guobao Wang; Yongqiang Yuan; Jean Louis Morel; Zekai Feng; Daijie Chen; Chunfeng Lu; Meina Guo; Chong Liu; Shizhong Wang; Yuanqing Chao; Yetao Tang; Dongye Zhao; Shi Xiao; Weixian Zhang; Rongliang Qiu. 2020. "Biological aqua crust mitigates metal(loid) pollution and the underlying immobilization mechanisms." Water Research 190, no. : 116736.

Journal article
Published: 13 March 2020 in Journal of Environmental Management
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Metal tailings are potential sources of strong environmental pollution. In situ remediation involves the installation of a plant cover to stabilize materials and pollutants. Whether metal(loid)s are effectively immobilized in remediated tailing ponds submitted to heavy rainfall remains uncertain. In this study, tailing materials were collected from bare tailings (control), grass-planted (G) and grass-shrub planted (GS) areas on a former Pb/Zn mine site. Batch column experiments were performed with three rainfall intensities of 0.36, 0.48, and 0.50 mL min−1 for 18 d in the lab. The pH, Eh, Cd, Pb, Zn and As concentration in leachate were recorded. Selected leached tailing materials were finally characterized. Results showed that leachates from control were strongly acidic (pH 3.11–4.65), and that Cd, Pb, Zn and As were quickly released at high rate (e.g., 945 mg L−1 Zn). During the experiment up to 4% Cd present in the material was released and almost 1% Zn. With material collected from the G area, leachates were even more acidic (2.16–2.84) with a rainfall intensity of 0.50 mL min−1 and exhibited a high redox potential (588–639 mV). However, concentrations of metals in leachates were much lower than that in the control, except for Zn (e.g., 433 mg L−1), and they tended to decrease with time. Cumulative leaching rate was still relatively high (e.g., 0.68% Cd; 0.75% Zn) during the first eight days (stage I). However, with the GS treatment, leachate pH gradually raised from acid to alkaline values (3.9–8.2) during stage I, then remained high until the end of the experiment (stage II). Also, amounts of elements released during the 18 d were low in general. The releasing ratios of Cd (R2 > 0.95), Pb (R2 > 0.95), As (R2 > 0.87), and Zn (R2 > 0.90) fitted well with a two-constant model. In conclusion, under subtropical climate with heavy rainfall, phytostabilization is effective but immobilization of metals is higher with a combination of grass and shrub than with only grass to reduce leaching of As and Zn.

ACS Style

Guobao Wang; Wanying Zhao; Yongqiang Yuan; Jean Louis Morel; Haochun Chi; Wenling Feng; Shizhong Wang; Jianxiang Zhang; Zekai Feng; Haoran Tan; Daijie Chen; Wenge Ding; Chong Liu; Rongliang Qiu. Mobility of metal(loid)s in Pb/Zn tailings under different revegetation strategies. Journal of Environmental Management 2020, 263, 110323 .

AMA Style

Guobao Wang, Wanying Zhao, Yongqiang Yuan, Jean Louis Morel, Haochun Chi, Wenling Feng, Shizhong Wang, Jianxiang Zhang, Zekai Feng, Haoran Tan, Daijie Chen, Wenge Ding, Chong Liu, Rongliang Qiu. Mobility of metal(loid)s in Pb/Zn tailings under different revegetation strategies. Journal of Environmental Management. 2020; 263 ():110323.

Chicago/Turabian Style

Guobao Wang; Wanying Zhao; Yongqiang Yuan; Jean Louis Morel; Haochun Chi; Wenling Feng; Shizhong Wang; Jianxiang Zhang; Zekai Feng; Haoran Tan; Daijie Chen; Wenge Ding; Chong Liu; Rongliang Qiu. 2020. "Mobility of metal(loid)s in Pb/Zn tailings under different revegetation strategies." Journal of Environmental Management 263, no. : 110323.

Journal article
Published: 07 March 2020 in Chemosphere
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Novel alternatives of perfluorooctane sulfonate (PFOS), chlorinated polyfluorinated ether sulfonates (Cl-PFAESs) are increasingly being detected in the aquatic and terrestrial environment. Previous studies mainly focused on aquatic biota; however, the knowledge about the ecotoxicological risk they pose to terrestrial plants was still lacking. In this study, the accumulation of two Cl-PFAES (6:2 and 8:2 Cl-PFAES) and PFOS in wheat seedlings at environmentally relevant levels (50 and 100 μg L−1) was investigated. Concentrations of Cl-PFAESs in the roots were an order of magnitude higher than those in shoots, indicating that they were primarily accumulated in the roots. The values of root and shoot bioconcentration factor was comparable between 6:2 Cl-PFAES and PFOS. However, these indexes of 8:2 Cl-PFAES were 42–91% higher and 70–76% lower than PFOS, respectively. As a result, 6:2 Cl-PFAES had a similar accumulation pattern as PFOS, whereas 8:2 Cl-PFAES was predominantly restricted to the roots, which might be attributed to their hydrophobicity and carbon chain length. In addition, at 250 mg L−1 of Cl-PFAESs, plant biomass and pigment content were 24–30% and 0.4–18%, respectively, which were lower than those of PFOS. As compared with PFOS, Cl-PFAESs induced higher levels of root membrane permeability, reactive oxygen species and malondialdehyde content, as well as reduced the activities of antioxidant enzymes and glutathione content. These suggested the occurrence of a severer oxidative damage and the breakdown of the antioxidant defence system in wheat cells. Therefore, we conclude that Cl-PFAESs might pose a higher potential threat to the environment than PFOS.

ACS Style

Qingqi Lin; Can Zhou; Lei Chen; Yafei Li; Xiongfei Huang; Shizhong Wang; Rongliang Qiu; Changyuan Tang. Accumulation and associated phytotoxicity of novel chlorinated polyfluorinated ether sulfonate in wheat seedlings. Chemosphere 2020, 249, 126447 .

AMA Style

Qingqi Lin, Can Zhou, Lei Chen, Yafei Li, Xiongfei Huang, Shizhong Wang, Rongliang Qiu, Changyuan Tang. Accumulation and associated phytotoxicity of novel chlorinated polyfluorinated ether sulfonate in wheat seedlings. Chemosphere. 2020; 249 ():126447.

Chicago/Turabian Style

Qingqi Lin; Can Zhou; Lei Chen; Yafei Li; Xiongfei Huang; Shizhong Wang; Rongliang Qiu; Changyuan Tang. 2020. "Accumulation and associated phytotoxicity of novel chlorinated polyfluorinated ether sulfonate in wheat seedlings." Chemosphere 249, no. : 126447.

Journal article
Published: 24 August 2019 in Chemosphere
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Mercury (Hg) mining activities are an important anthropogenic source of atmospheric Hg. The Xunyang Hg mine located in Shaanxi Province is the largest active Hg producing centre in China. To understand the biogeochemical processes of atmospheric Hg through Hg mining activities, six groups of experimental pots were carefully designed to investigate the effect of Hg mining activities on Hg contamination from atmospheric deposition in the local surface soils. Based on the variations of Hg in the soil from the experimental pots, the deposition flux and loading of Hg in the Xunyang Hg mining district were investigated. The results showed that the average concentration of total gaseous mercury (TGM) as high as 193 ± 122 ng m−3 was observed in the ambient air, which was orders of magnitude higher than that in remote areas. The average deposition flux and annual loading of atmospheric Hg were 72 mg m−2 y−1 and 10 t y−1, respectively. The dominant atmospheric Hg deposition is within a distance range of 6.0–12 km from the Hg retorting facility, accounting for approximately 85% of the total Hg loading. After 14 months of exposure, total mercury (THg) concentrations in the soil from the experimental pots increased 0.35–9.5 times, and the highest concentrations of methylmercury (MeHg) (3.7 ± 2.9 μg kg−1) in soil were observed in February. Concentrations as high as 643 μg kg−1 THg and 13 μg kg−1 MeHg in rice were observed in the second experimental year. Elevated concentrations of both THg and MeHg in rice indicated that the newly deposited atmospheric Hg was bioavailable, readily methylated, and taken up by rice, suggesting that the ongoing Hg mining activities cause serious Hg contamination in the soil-rice ecosystem and posed a threat to local residents in the Xunyang Hg mining area.

ACS Style

Ming Ao; Xiaohang Xu; Yonggui Wu; Chao Zhang; Bo Meng; Lihai Shang; Longchao Liang; Rongliang Qiu; Shizhong Wang; Xiaoli Qian; Lei Zhao; Guangle Qiu. Newly deposited atmospheric mercury in a simulated rice ecosystem in an active mercury mining region: High loading, accumulation, and availability. Chemosphere 2019, 238, 124630 .

AMA Style

Ming Ao, Xiaohang Xu, Yonggui Wu, Chao Zhang, Bo Meng, Lihai Shang, Longchao Liang, Rongliang Qiu, Shizhong Wang, Xiaoli Qian, Lei Zhao, Guangle Qiu. Newly deposited atmospheric mercury in a simulated rice ecosystem in an active mercury mining region: High loading, accumulation, and availability. Chemosphere. 2019; 238 ():124630.

Chicago/Turabian Style

Ming Ao; Xiaohang Xu; Yonggui Wu; Chao Zhang; Bo Meng; Lihai Shang; Longchao Liang; Rongliang Qiu; Shizhong Wang; Xiaoli Qian; Lei Zhao; Guangle Qiu. 2019. "Newly deposited atmospheric mercury in a simulated rice ecosystem in an active mercury mining region: High loading, accumulation, and availability." Chemosphere 238, no. : 124630.

Journal article
Published: 27 June 2019 in Sustainability
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Assessment of the impacts of land use/cover change (LUCC) and rainfall change on surface runoff depth can help provide an understanding of the temporal trend of variation of surface runoff and assist in urban construction planning. This study evaluated the impacts of LUCC and rainfall change on surface runoff depth by adopting the well-known Soil Conservation Service-Curve Number (SCS-CN) method and the widely used Long-Term Hydrologic Impact Assessment (L-THIA) model. National hydrologic soil group map of China was generated based on a conversion from soil texture classification system. The CN values were adjusted based on the land use/cover types and soil properties in China. The L-THIA model was configured by using the adjusted CN values and then applied nationally in China. Results show that nationwide rainfall changes and LUCC from 2005 to 2010 had little impact on the distribution of surface runoff, and the high values of runoff depth were mainly located in the middle and lower reaches of the Yangtze River. Nationally, the average annual runoff depths in 2005, 2010 and 2015 were 78 mm, 83 mm and 90 mm, respectively. For the 2015 land use data, rainfall change caused the variation of surface runoff depth ranging from −203 mm to 476 mm in different regions. LUCC from 2005 to 2015 did not cause obvious change of surface runoff depth, but expansion of developed land led to runoff depth increases ranging from 0 mm to 570 mm and 0 mm to 742 mm from 2005 to 2010 and 2010 to 2015, respectively. Potential solutions to urban land use change and surface runoff control were also analyzed.

ACS Style

Fazhi Li; Jingqiu Chen; Yaoze Liu; Peng Xu; Hua Sun; Bernard A. Engel; Shizhong Wang. Assessment of the Impacts of Land Use/Cover Change and Rainfall Change on Surface Runoff in China. Sustainability 2019, 11, 3535 .

AMA Style

Fazhi Li, Jingqiu Chen, Yaoze Liu, Peng Xu, Hua Sun, Bernard A. Engel, Shizhong Wang. Assessment of the Impacts of Land Use/Cover Change and Rainfall Change on Surface Runoff in China. Sustainability. 2019; 11 (13):3535.

Chicago/Turabian Style

Fazhi Li; Jingqiu Chen; Yaoze Liu; Peng Xu; Hua Sun; Bernard A. Engel; Shizhong Wang. 2019. "Assessment of the Impacts of Land Use/Cover Change and Rainfall Change on Surface Runoff in China." Sustainability 11, no. 13: 3535.

Journal article
Published: 27 May 2019 in Journal of Hazardous Materials
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This study developed a cost-effective and eco-friendly method by coupling plant extracts (take green tea for example) and Fe(III) to reduce Cr(VI) and precipitate Cr(III). At acidic pH, 1.43 mM Fe(III) combined with 1.33 g/L green tea extracts could reduce 93% of Cr(VI) in 180 min, which was much larger than ˜50% by green tea extracts alone. Moreover, 52% of Cr(III) could automatically precipitate out as mixed Fe(III)-Cr(III) (oxy)-hydroxide solids. In the viewpoint of mechanism, polyphenols in green tea extracts were the reactive constituents and transformed Fe(III) to Fe(II), by which step the aqueous Fe(II) levels were maintained to continuously reduce Cr(VI) to Cr(III), and thus accelerating Cr(VI) reduction. The generated Fe(III) partially participated in the reaction with polyphenols again and some Fe(III) formed precipitates with Cr(III). Overall. the electron transfers in the polyphenol-Fe-Cr cyclic reactions made Fe(III) use for multiple times, thus accelerated Cr(VI) reduction. The applicability of the combined process was further verified by removing 100% and 70% of Cr(VI) from electroplating wastewater and contaminated soil, respectively. As polyphenols can be derived from plant wastes and Fe(III) is naturally abundant, this study provides a promising method for in situ remediation of Cr(VI)-contaminated sites.

ACS Style

Yu Wang; Si-Yuan Chen; Xin Yang; Yingxin Wu; Xiong-Fei Huang; Er-Kai He; Rong-Liang Qiu; Shizhong Wang. Enhanced removal of Cr(VI) in the Fe(III)/natural polyphenols system: role of the in situ generated Fe(II). Journal of Hazardous Materials 2019, 377, 321 -329.

AMA Style

Yu Wang, Si-Yuan Chen, Xin Yang, Yingxin Wu, Xiong-Fei Huang, Er-Kai He, Rong-Liang Qiu, Shizhong Wang. Enhanced removal of Cr(VI) in the Fe(III)/natural polyphenols system: role of the in situ generated Fe(II). Journal of Hazardous Materials. 2019; 377 ():321-329.

Chicago/Turabian Style

Yu Wang; Si-Yuan Chen; Xin Yang; Yingxin Wu; Xiong-Fei Huang; Er-Kai He; Rong-Liang Qiu; Shizhong Wang. 2019. "Enhanced removal of Cr(VI) in the Fe(III)/natural polyphenols system: role of the in situ generated Fe(II)." Journal of Hazardous Materials 377, no. : 321-329.

Journal article
Published: 19 May 2019 in Journal of Soils and Sediments
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Iron plaque (IP) formation via radial oxygen loss (ROL) of wetland plant has been predominantly recognized as the reason for heavy metal sequestration in the rhizosphere. However, the same contribution of the microbes living in a potential rhizoplane biofilm matrix has not been comprehensively elucidated. In this review, we proposed a conceptional model of the wetland plant rhizoplane biofilm and summarized the possible pathways therein for heavy metal precipitation and iron-sulfur cycle termination. After an introduction of the effects of IP and microbes on the phytoremediation of heavy metal-contaminated wetland, the distribution of rhizospheric bacteria and different metal speciations resulted from wetland plant ROL were demonstrated. Based on the studies of microflora in the rhizosphere and IP, coupled with the ROL nature, we proposed an existence of rhizoplane biofilm with a special structure that could contribute to the rhizospheric iron-sulfur cycle termination by the production of heavy metal precipitates (metal sulfides). The ROL leads to the diffusion of oxygen with a decreasing gradient from the root surface (rhizoplane) to the bulk soil, allowing the formation of an unconventional rhizoplane biofilm comprising an aerobic inner layer and an anaerobic outer layer. Thus, aerobic bacteria, e.g., iron-oxidizing bacteria (IOB) and sulfur-oxidizing bacteria (SOB), as well as anaerobic bacteria, e.g., iron-reducing bacteria (IRB) and sulfate-reducing bacteria (SRB), are favored in the inner layer and outer layer of the rhizoplane biofilm, respectively. In the inner layer, ferrous sulfide is oxidized by IOB and SOB to Fe3+ and SO42−. Fe3+ is thereafter bound with oxygen into iron (hydro)oxides, aggregating into a barrier of iron plaque for heavy metal sequestration and O2 diffusion. Excessive SO42− diffused to the outer layer is reduced to S2− by SRB, forming sufficient metal sulfide precipitates that on one hand immobilize those heavy metal ions released by H+, and on the other hand serve as a barrier for preventing the contact of ferrous sulfide from O2. Hence, further oxidization of ferrous sulfide is terminated. This rhizoplane biofilm co-existing with IP contributes to the rhizosphere element circulation. Further investigation and demonstration of its composition, structure, and function will help us better interpret the survival strategy and bioremediation potential of wetland plants in flooded mining areas, such as mine tailing ponds in tropical and sub-tropical regions with abundant rainfall.

ACS Style

Yuanyuan Li; Wenling Feng; Haochun Chi; Yunxi Huang; Dishen Ruan; Yuanqing Chao; Rongliang Qiu; Shizhong Wang. Could the rhizoplane biofilm of wetland plants lead to rhizospheric heavy metal precipitation and iron-sulfur cycle termination? Journal of Soils and Sediments 2019, 19, 3760 -3772.

AMA Style

Yuanyuan Li, Wenling Feng, Haochun Chi, Yunxi Huang, Dishen Ruan, Yuanqing Chao, Rongliang Qiu, Shizhong Wang. Could the rhizoplane biofilm of wetland plants lead to rhizospheric heavy metal precipitation and iron-sulfur cycle termination? Journal of Soils and Sediments. 2019; 19 (11):3760-3772.

Chicago/Turabian Style

Yuanyuan Li; Wenling Feng; Haochun Chi; Yunxi Huang; Dishen Ruan; Yuanqing Chao; Rongliang Qiu; Shizhong Wang. 2019. "Could the rhizoplane biofilm of wetland plants lead to rhizospheric heavy metal precipitation and iron-sulfur cycle termination?" Journal of Soils and Sediments 19, no. 11: 3760-3772.

Journal article
Published: 09 April 2019 in Science of The Total Environment
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A two-year soil incubation experiment was performed to investigate the long-term impacts of biochars (kenaf core and sewage sludge biochar (KBC and SBC) pyrolyzed at 350 °C and 550 °C) on metal(loid)s immobilization. Both KBC and SBC can immobilize Pb and Cu in contaminated soil, whereas they showed little effects on the immobilization of Zn, Cd and As. Interactions between the biochar and soil during two-year aging changed the metal species on both soil and biochar particles. KB350 formed more biochar-mineral complexes and O-containing functional groups than KB550 and thus transferred more residual metal(loid)s to their reducible species. More metal(loid)s sorbed on the KB350 than KB550 after two-year aging. However, SBC changed the acid-soluble species of metal(loid)s into the residual species during the aging process, probably due to the release of phosphate. Upon aging, SB550 exhibited a more significant increase in the residual metal amount and more sorption of metal(loid)s on the biochar particles than SB350 due to sorption of organic carbon and formation of meta-kaolinite. A key finding of our study was that different biochars have contrasting impacts on metal speciation and lability upon 2-year aging. This should be considered in assessing the actual risk of biochar-amended soils.

ACS Style

Erkai He; Yuxi Yang; Zibo Xu; Hao Qiu; Fan Yang; Willie J.G.M. Peijnenburg; Weihua Zhang; Rongliang Qiu; Shizhong Wang. Two years of aging influences the distribution and lability of metal(loid)s in a contaminated soil amended with different biochars. Science of The Total Environment 2019, 673, 245 -253.

AMA Style

Erkai He, Yuxi Yang, Zibo Xu, Hao Qiu, Fan Yang, Willie J.G.M. Peijnenburg, Weihua Zhang, Rongliang Qiu, Shizhong Wang. Two years of aging influences the distribution and lability of metal(loid)s in a contaminated soil amended with different biochars. Science of The Total Environment. 2019; 673 ():245-253.

Chicago/Turabian Style

Erkai He; Yuxi Yang; Zibo Xu; Hao Qiu; Fan Yang; Willie J.G.M. Peijnenburg; Weihua Zhang; Rongliang Qiu; Shizhong Wang. 2019. "Two years of aging influences the distribution and lability of metal(loid)s in a contaminated soil amended with different biochars." Science of The Total Environment 673, no. : 245-253.

Journal article
Published: 30 November 2018 in Journal of Environmental Sciences
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The effects of interaction between Bacillus subtilis DBM and soil minerals on Cu(II) and Pb(II) adsorption were investigated. After combination with DBM, the Cu(II) and Pb(II) adsorption capacities of kaolinite and goethite improved compared with the application of the minerals independently. The modeling results of potentiometric titration data proved that the site concentrations of kaolinite and goethite increased by 80% and 30%, respectively after combination with DBM. However, the involvement of functional groups in the DBM/mineral combinations resulted in lower concentrations of observed sites than the theoretical values and led to the enhancement of desorption rates by NH4NO3 and EDTA-Na2. The DBM-mineral complexes might also help to prevent heavy metals from entering DBM cells to improve the survivability of DBM in heavy metal-contaminated environments. During the combination process, the extracellular proteins of DBM provided more binding sites for the minerals to absorb Cu(II) and Pb(II). In particular, an especially stable complexation site was formed between goethite and phosphodiester bonds from EPS to enhance the Pb(II) adsorption capacity. So, we can conclude that the DBM–mineral complexes could improve the Cu(II) and Pb(II) adsorption capacities of minerals and protect DBM in heavy metal-contaminated environments.

ACS Style

Jun Bai; Yuanqing Chao; Yanmei Chen; Shizhong Wang; Rongliang Qiu. The effect of interaction between Bacillus subtilis DBM and soil minerals on Cu(II) and Pb(II) adsorption. Journal of Environmental Sciences 2018, 78, 328 -337.

AMA Style

Jun Bai, Yuanqing Chao, Yanmei Chen, Shizhong Wang, Rongliang Qiu. The effect of interaction between Bacillus subtilis DBM and soil minerals on Cu(II) and Pb(II) adsorption. Journal of Environmental Sciences. 2018; 78 ():328-337.

Chicago/Turabian Style

Jun Bai; Yuanqing Chao; Yanmei Chen; Shizhong Wang; Rongliang Qiu. 2018. "The effect of interaction between Bacillus subtilis DBM and soil minerals on Cu(II) and Pb(II) adsorption." Journal of Environmental Sciences 78, no. : 328-337.

Journal article
Published: 22 November 2018 in International Journal of Environmental Research and Public Health
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The survival of wetland plants in iron, sulfur and heavy metals-rich mine tailing ponds has been commonly attributed to the iron plaque (IP) on the root surface that acts as a protective barrier. However, the contribution of bacteria potentially regulates the iron-sulfur cycle and heavy metal exclusion at the root surface has not been studied in depth, particularly from a microbial ecology perspective. In this study, a pot experiment using Typha latifolia, a typical wetland plant, in non-polluted soil (NP) and tailing soil (T) was conducted. Samples from four zones, comprising non-rhizosphere soil (NR), rhizosphere soil (R) and internal (I) and external (E) layers of iron plaque, were collected from the NP and T and analyzed by 16S rRNA sequencing. Simpson index of the genus level showed greater diversities of bacterial community in the NP and its I zone is the most important part of the rhizosphere. PICRUSt predicted that the I zones in both NP and T harbored most of the functional genes. Specifically, functional genes related to sulfur relay and metabolism occurred more in the I zone in the T, whereas those related to iron acquisition and carbon and nitrogen circulation occurred more in the I zone in the NP. Analysis of dominant bacterial communities at genus level showed highest abundance of heavy metal resistant genus Burkholderia in the E zones in both soils, indicating that heavy metal resistance of Typha latifolia driven by Burkholderia mainly occurred at the external layer of IP. Moreover, many bacterial genera, such as Acidithiobacillus, Ferritrophicum, Thiomonas, Metallibacterium and Sideroxydans, involved in iron and sulfur metabolisms were found in the T and most showed higher abundance in the I zone than in the other zones. This work, as the first endeavor to separate the iron plaque into external and internal layers and investigate the variations of the bacterial communities therein, can provide an insight for further understanding the survival strategy of wetland plants, e.g., Typha latifolia, in extreme environment.

ACS Style

Haochun Chi; Lu Yang; Wenjing Yang; Yuanyuan Li; Ziwu Chen; Lige Huang; Yuanqing Chao; Rongliang Qiu; Shizhong Wang. Variation of the Bacterial Community in the Rhizoplane Iron Plaque of the Wetland Plant Typha latifolia. International Journal of Environmental Research and Public Health 2018, 15, 2610 .

AMA Style

Haochun Chi, Lu Yang, Wenjing Yang, Yuanyuan Li, Ziwu Chen, Lige Huang, Yuanqing Chao, Rongliang Qiu, Shizhong Wang. Variation of the Bacterial Community in the Rhizoplane Iron Plaque of the Wetland Plant Typha latifolia. International Journal of Environmental Research and Public Health. 2018; 15 (12):2610.

Chicago/Turabian Style

Haochun Chi; Lu Yang; Wenjing Yang; Yuanyuan Li; Ziwu Chen; Lige Huang; Yuanqing Chao; Rongliang Qiu; Shizhong Wang. 2018. "Variation of the Bacterial Community in the Rhizoplane Iron Plaque of the Wetland Plant Typha latifolia." International Journal of Environmental Research and Public Health 15, no. 12: 2610.

Journal article
Published: 06 November 2018 in Talanta
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Carcinoembryonic antigen (CEA) has been recognized as one of the most important tumor markers. Herein, we reported an ultrasensitive homogeneous aptasensor based on fluorescence resonance energy transfer (FRET) between upconversion nanoparticles (UCNPs) and graphene oxide (GO) for CEA detection. The CEA aptamer modified UCNPs can bind to the surface of GO through π-π stacking interaction, resulting in fluorescence quenching due to the energy transfer from UCNPs to GO. After the introduction of CEA, the CEA aptamer preferentially combined with CEA to form three-dimensional structure which made UCNPs-aptamer dissociate from the GO, blocking the energy transfer process. The fluorescence of UCNPs was accordingly restored in a CEA concentration-dependent manner both aqueous solution and human serum samples. The aptasensor could monitor CEA level directly in human serum and the results were strongly correlated with commercial chemiluminescence kits. The excellent detection performance suggested promising prospect of the aptasensor in practical application.

ACS Style

Yujie Wang; Zikai Wei; Xianda Luo; Quan Wan; Rongliang Qiu; Shizhong Wang. An ultrasensitive homogeneous aptasensor for carcinoembryonic antigen based on upconversion fluorescence resonance energy transfer. Talanta 2018, 195, 33 -39.

AMA Style

Yujie Wang, Zikai Wei, Xianda Luo, Quan Wan, Rongliang Qiu, Shizhong Wang. An ultrasensitive homogeneous aptasensor for carcinoembryonic antigen based on upconversion fluorescence resonance energy transfer. Talanta. 2018; 195 ():33-39.

Chicago/Turabian Style

Yujie Wang; Zikai Wei; Xianda Luo; Quan Wan; Rongliang Qiu; Shizhong Wang. 2018. "An ultrasensitive homogeneous aptasensor for carcinoembryonic antigen based on upconversion fluorescence resonance energy transfer." Talanta 195, no. : 33-39.

Review
Published: 28 August 2018 in Chinese Science Bulletin
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ACS Style

Peng Zhang; Wenjun Yang; Tenghaobo Deng; Yuanqing Chao; Shizhong Wang; Rongliang Qiu; Yetao Tang. Stable isotope fractionation of zinc and cadmium in soil-plant system: A review. Chinese Science Bulletin 2018, 63, 2944 -2953.

AMA Style

Peng Zhang, Wenjun Yang, Tenghaobo Deng, Yuanqing Chao, Shizhong Wang, Rongliang Qiu, Yetao Tang. Stable isotope fractionation of zinc and cadmium in soil-plant system: A review. Chinese Science Bulletin. 2018; 63 (28-29):2944-2953.

Chicago/Turabian Style

Peng Zhang; Wenjun Yang; Tenghaobo Deng; Yuanqing Chao; Shizhong Wang; Rongliang Qiu; Yetao Tang. 2018. "Stable isotope fractionation of zinc and cadmium in soil-plant system: A review." Chinese Science Bulletin 63, no. 28-29: 2944-2953.

Journal article
Published: 22 August 2018 in Chemosphere
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Surfactants are used to assist the zero-valent iron-mediated reductive dechlorination (ZVI-RD) of hydrophobic organic contaminants (HOCs). Although the effect of surfactants has been investigated in single-factor systems, the relationships between the surfactant and the matrix properties during RD are not well understood. Thus, an orthogonal experiment and post-experiment characterization of ZVI were conducted in the present study to estimate the integrated effects of plausible factors. The results showed that the introduction of surfactants significantly influenced the reduction of 2,2′,5,5′-tetrachlorinated biphenyl (PCB-52) by altering the contact between ZVI and PCB-52. An anionic surfactant was able to alleviate the adverse impact of high amounts of non-ionic surfactants and humic acid (used as representative soil organic matter) by changing their sorption behaviors, which were also influenced by the initial pH value. However, the reduction of ZVI by humic acid decreased the electron transfer efficiency of ZVI, and also reduced the contact between ZVI and PCB-52 by generating FeCO3. These results suggest that the rate-limiting process for the ZVI-RD of HOCs in the soil/sediment solution is the contact between ZVI and HOCs, which can be improved by the addition of surfactants at concentrations corresponding to the maximum adsorption capacity of HOCs on the ZVI surface.

ACS Style

Yingxin Wu; Yu Wang; Xiongfei Huang; Marie-Odile Simonnot; Wencheng Wu; Xinde Cai; Siyuan Chen; Shizhong Wang; Rongliang Qiu; Weihua Zhang. Surfactant-facilitated dechlorination of 2,2′,5,5′-tetrachlorinated biphenyl using zero-valent iron in soil/sediment solution: Integrated effects of plausible factors. Chemosphere 2018, 212, 845 -852.

AMA Style

Yingxin Wu, Yu Wang, Xiongfei Huang, Marie-Odile Simonnot, Wencheng Wu, Xinde Cai, Siyuan Chen, Shizhong Wang, Rongliang Qiu, Weihua Zhang. Surfactant-facilitated dechlorination of 2,2′,5,5′-tetrachlorinated biphenyl using zero-valent iron in soil/sediment solution: Integrated effects of plausible factors. Chemosphere. 2018; 212 ():845-852.

Chicago/Turabian Style

Yingxin Wu; Yu Wang; Xiongfei Huang; Marie-Odile Simonnot; Wencheng Wu; Xinde Cai; Siyuan Chen; Shizhong Wang; Rongliang Qiu; Weihua Zhang. 2018. "Surfactant-facilitated dechlorination of 2,2′,5,5′-tetrachlorinated biphenyl using zero-valent iron in soil/sediment solution: Integrated effects of plausible factors." Chemosphere 212, no. : 845-852.

Journal article
Published: 23 July 2018 in Science of The Total Environment
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Successful in situ phytoremediation depends on beneficial interactions between roots and microbes. However, the assembly strategies of root-associated microbiome during phytoremediation are not well known. Here we investigated the assembly patterns of root-associated microbiomes during phytoremediation as well as its regulation by both plants and heavy metals. Plant cultivation and soil amendment increased microbial diversity and restructured microbial communities. Rhizo-compartmentalization was the largest source of variation in root-associated microbiomes, with endosphere being the most independent and exclusive compartment. Soil type explained a larger amount of microbiomes variation in bulk soil and rhizosphere than that in endosphere. A specific core root microbiome was likely to be selected by the metal-tolerant plant H. cannabinus, with Enterobacteriaceae, Pseudomonadaceae and Comamonadaceae which contain a large number of metal-tolerant and plant growth-promoting bacteria (PGPB) being the most abundant families. The root-associated microbial community tended to proceed a niche-assembled patterns and formed a smaller bacterial pool dominant by Proteobacteria, Actinobacteria and Chloroflexi under metal-contaminated conditions. Among these genera, potential metal-tolerant PGPB species have taken up the keystone positions in the microbial co-occurrence networks, revealing their key roles in metal-contaminated environment due to niche selection. We also detected a keystone functional group reducing metal bioavailability which might work as vanguards and devote to maintaining the structure and function of the whole microbial community. In conclusion, this study suggested a specific assembly pattern of root-associated microbiomes of the metal-tolerant plant H. cannabinus during phytoremediation, showing the directional selections of the associated microbiomes by both the plant and metal-contaminated conditions in such a system.

ACS Style

Yanmei Chen; Qiaobei Ding; Yuanqing Chao; Xiange Wei; Shizhong Wang; Rongliang Qiu. Structural development and assembly patterns of the root-associated microbiomes during phytoremediation. Science of The Total Environment 2018, 644, 1591 -1601.

AMA Style

Yanmei Chen, Qiaobei Ding, Yuanqing Chao, Xiange Wei, Shizhong Wang, Rongliang Qiu. Structural development and assembly patterns of the root-associated microbiomes during phytoremediation. Science of The Total Environment. 2018; 644 ():1591-1601.

Chicago/Turabian Style

Yanmei Chen; Qiaobei Ding; Yuanqing Chao; Xiange Wei; Shizhong Wang; Rongliang Qiu. 2018. "Structural development and assembly patterns of the root-associated microbiomes during phytoremediation." Science of The Total Environment 644, no. : 1591-1601.

Journal article
Published: 23 July 2018 in Chemosphere
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A two stage multi-fraction 1st-order kinetic model was established herein, which incorporates Cd species distribution in the contaminated site, chelate dosage and washing time, and two distinct extraction mechanisms are also emphasized there. The model was found to successfully simulate the experimental data of Cd extraction by EDTA; with the obtained parameters, we also got a similarly good agreement in other two Cd-contaminated soils. All normalized root-mean-square error, the index of agreement and modeling efficiency values showed that this model can be used to predict Cd kinetic extraction process in different types of soils with an excellent validity. Both simulated and experimental results indicate that a greater EDTA dosage reasonably leads to a higher Cd extraction efficiency and a faster extraction by the direct EDTA-complex. Different Cd species also show different extraction behavior. Part of Cd species associated with Fe/Mn hydro(oxides) (FeMnOx) become destabilized by slow EDTA-promoted dissolution but not yet detached, leading to an apparently high removal efficiency of Cd in FeMnOx fraction dependent on EDTA dosage. While the removal of exchangeable Cd and carbonates (EXCH+CARB) seemed unchanged with the EDTA dosage, due to the transformation of the undetached Cd in FeMnOx fractions. However, an extreme dosage (i.e. molar ratio of EDTA to metal equal to 20 herein) may accelerate the detachment of these destabilized Cd species, resulting in a substantially high extraction efficiency of EXCH+CARB fraction.

ACS Style

Hang Wei; Weihua Zhang; Luwen Zhuang; Shizhong Wang; Daniel C.W. Tsang; Rongliang Qiu. Two-stage multi-fraction first-order kinetic modeling for soil Cd extraction by EDTA. Chemosphere 2018, 211, 1035 -1042.

AMA Style

Hang Wei, Weihua Zhang, Luwen Zhuang, Shizhong Wang, Daniel C.W. Tsang, Rongliang Qiu. Two-stage multi-fraction first-order kinetic modeling for soil Cd extraction by EDTA. Chemosphere. 2018; 211 ():1035-1042.

Chicago/Turabian Style

Hang Wei; Weihua Zhang; Luwen Zhuang; Shizhong Wang; Daniel C.W. Tsang; Rongliang Qiu. 2018. "Two-stage multi-fraction first-order kinetic modeling for soil Cd extraction by EDTA." Chemosphere 211, no. : 1035-1042.

Journal article
Published: 12 March 2018 in International Journal of Environmental Research and Public Health
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To explore the effect of different biochars on Cassia alata L. growth and heavy metal immobilization in multi-metal mine tailings, a 100-day pot experiment was conducted. Three biochars derived from Hibiscus cannabinus core (HB), sewage sludge (SB) and chicken manure (MB), were added to mine tailings at rates of 0.4%, 1% and 3% (w/w). The results showed that the root biomass, shoot biomass, plant height and root length were 1.2–2.8, 1.7–3.2, 1–1.5 and 1.6–3.3 times of those in the control group, respectively. Pb, Zn, Cu, Cd and As contents in the shoot decreased by 63.9–89.5%, 46.9–66.0%, 32.7–62.4%, 40.4–76.4% and 54.9–77.5%, respectively. The biochar significantly increased the pH and decreased the mild acid-soluble Pb and Cu concentrations in the mine tailings. Specifically, SB immobilized Pb and Cu better than MB and HB did, although it did not immobilize As, Zn or Cd. Meanwhile, more attention should be paid to the potential As release as the biochar application rate increases. In conclusion, Cassia alata L. coupled with 3% of SB could be an effective measure for restoring multi-metal mine tailings. This study herein provided a promising ecological restoration technique for future practice of heavy metal stabilization in mine tailings.

ACS Style

Lige Huang; Yuanyuan Li; Man Zhao; Yuanqing Chao; Rongliang Qiu; Yanhua Yang; Shizhong Wang. Potential of Cassia alata L. Coupled with Biochar for Heavy Metal Stabilization in Multi-Metal Mine Tailings. International Journal of Environmental Research and Public Health 2018, 15, 494 .

AMA Style

Lige Huang, Yuanyuan Li, Man Zhao, Yuanqing Chao, Rongliang Qiu, Yanhua Yang, Shizhong Wang. Potential of Cassia alata L. Coupled with Biochar for Heavy Metal Stabilization in Multi-Metal Mine Tailings. International Journal of Environmental Research and Public Health. 2018; 15 (3):494.

Chicago/Turabian Style

Lige Huang; Yuanyuan Li; Man Zhao; Yuanqing Chao; Rongliang Qiu; Yanhua Yang; Shizhong Wang. 2018. "Potential of Cassia alata L. Coupled with Biochar for Heavy Metal Stabilization in Multi-Metal Mine Tailings." International Journal of Environmental Research and Public Health 15, no. 3: 494.

Chapter
Published: 18 January 2018 in Twenty Years of Research and Development on Soil Pollution and Remediation in China
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Soil heavy metal contamination was found much more serious in Southern China than the North. In Southern China, contaminated soils are difficult to be remediated or reclaimed due to its characteristics of high acidity, low nutrients, and high heavy metal contents. For decades, we have worked on soil remediation and made progresses on ① discovery of heavy metals tolerant plants and hyperaccumulators, ② screening for better soil amendments, and ③ suitable remediation systems for contaminated soils of different degrees.

ACS Style

Kengbo Ding; Chang Liu; Yetao Tang; Shizhong Wang; Xiange Wei; Yuanqing Chao; Rongliang Qiu. Phytoremediation of Heavy Metal-Contaminated Soil in Southern China. Twenty Years of Research and Development on Soil Pollution and Remediation in China 2018, 375 -387.

AMA Style

Kengbo Ding, Chang Liu, Yetao Tang, Shizhong Wang, Xiange Wei, Yuanqing Chao, Rongliang Qiu. Phytoremediation of Heavy Metal-Contaminated Soil in Southern China. Twenty Years of Research and Development on Soil Pollution and Remediation in China. 2018; ():375-387.

Chicago/Turabian Style

Kengbo Ding; Chang Liu; Yetao Tang; Shizhong Wang; Xiange Wei; Yuanqing Chao; Rongliang Qiu. 2018. "Phytoremediation of Heavy Metal-Contaminated Soil in Southern China." Twenty Years of Research and Development on Soil Pollution and Remediation in China , no. : 375-387.

Journal article
Published: 01 December 2017 in Environmental Pollution
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Cadmium uptake in rice is believed to be mediated by the Fe transport system. Phyto-available Cd can be changed by Fe fertilization of substrates. This work investigated whether and how Fe fertilization affects mitigation of Cd accumulation in paddy rice. A 90-d soil column experiment was conducted to study the change of Cd and Fe availability in soil after Fe fertilization (ionic and chelated Fe). A low-Cd accumulating cultivar (TY116) and a high-Cd accumulating cultivar (JY841) were grown in two Cd-polluted paddy soils amended with chelated Fe fertilizers. Additionally, both cultivars were grown in hydroponics to compare Fe-related gene expression in EDDHAFe-deficient and EDDHAFe-sufficient roots. The column experiment showed that EDTANa2Fe(II) and EDDHAFe(III) fertilization had a better mitigation effect on soil Cd availability compared to FeSO4·7H2O. Moreover, the field experiment demonstrated that these two chelated fertilizations could reduce Cd concentrations in brown rice by up to 80%. Iron concentrations in the brown rice were elevated by Fe chelates. Compared to EDDHAFe(III), EDTANa2Fe(II) fertilization had a stronger mitigation effect by generating more EDTANa2Cd(II) in the soil solution to decrease phyto-available Cd in the soil. While EDDHAFe(III) fertilization could increase soil pH and decrease soil Eh which contributed to decreasing phyto-available Cd in a contaminated soil. In the hydroponic experiment, Fe sufficiency significantly reduced Cd concentrations in above-ground organs. In some cases, the expression of OsIRT1, OsNRAMP1 and OsNRAMP5 was inhibited under Fe sufficiency relative to Fe deficiency conditions. These results suggest that mitigation of rice Cd by Fe chelate fertilization results from a decrease in available Cd in substrates and the inhibition of the expression of several Fe-related genes in the IRT and NRAMP families.

ACS Style

Zhe Chen; Ye-Tao Tang; Ai-Jun Yao; Jian Cao; Zhuo-Hao Wu; Zhe-Ran Peng; Shi-Zhong Wang; Shi Xiao; Alan J.M. Baker; Rong-Liang Qiu. Mitigation of Cd accumulation in paddy rice (Oryza sativa L.) by Fe fertilization. Environmental Pollution 2017, 231, 549 -559.

AMA Style

Zhe Chen, Ye-Tao Tang, Ai-Jun Yao, Jian Cao, Zhuo-Hao Wu, Zhe-Ran Peng, Shi-Zhong Wang, Shi Xiao, Alan J.M. Baker, Rong-Liang Qiu. Mitigation of Cd accumulation in paddy rice (Oryza sativa L.) by Fe fertilization. Environmental Pollution. 2017; 231 ():549-559.

Chicago/Turabian Style

Zhe Chen; Ye-Tao Tang; Ai-Jun Yao; Jian Cao; Zhuo-Hao Wu; Zhe-Ran Peng; Shi-Zhong Wang; Shi Xiao; Alan J.M. Baker; Rong-Liang Qiu. 2017. "Mitigation of Cd accumulation in paddy rice (Oryza sativa L.) by Fe fertilization." Environmental Pollution 231, no. : 549-559.

Article
Published: 06 February 2017 in Water, Air, & Soil Pollution
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The mechanisms involved in immobilization of soil Cu and the role of extracellular polymeric substances (EPS) in Cu(II) adsorption by Bacillus subtilis DBM were investigated in this study. Adsorption and desorption experiments with intact DBM cells revealed that complexation with surface functional groups and intracellular accumulation were involved in the immobilization of soil Cu. The removal of EPS using cation exchange resin resulted in a 26.6% decrease in the Cu(II) adsorption capacity relative to untreated cells. Compared to intact cells, EPS-free cells showed a 9.9% decrease in the proportion of complexed Cu(II), while the intracellular fraction increased by 8.0%. Surface complexation modeling indicated that the total concentration of complexation sites on the intact DBM cell surface was 1.11 mmol/g dry biomass, which was decreased by 17% to 0.92 mmol/g after EPS removal. Infrared analysis revealed that the pKa values of the carboxyl and phosphate groups in the DBM cell wall differed from those in the EPS. Carboxyl, carbonyl, hydroxyl, amino, and phosphate groups were involved in binding Cu(II) by both intact and EPS-free cells, and Cu(II) was more likely to combine with organic rather than inorganic phosphates. The presence of the EPS increased the binding potential of surface functional groups and may help to prevent heavy metals from entering the cells.

ACS Style

Jun Bai; Yuanqing Chao; Yanmei Chen; Shizhong Wang; Rongliang Qiu. Immobilization of Cu by Bacillus subtilis DBM and the Role of Extracellular Polymeric Substances. Water, Air, & Soil Pollution 2017, 228, 86 .

AMA Style

Jun Bai, Yuanqing Chao, Yanmei Chen, Shizhong Wang, Rongliang Qiu. Immobilization of Cu by Bacillus subtilis DBM and the Role of Extracellular Polymeric Substances. Water, Air, & Soil Pollution. 2017; 228 (3):86.

Chicago/Turabian Style

Jun Bai; Yuanqing Chao; Yanmei Chen; Shizhong Wang; Rongliang Qiu. 2017. "Immobilization of Cu by Bacillus subtilis DBM and the Role of Extracellular Polymeric Substances." Water, Air, & Soil Pollution 228, no. 3: 86.

Journal article
Published: 01 February 2017 in Journal of Hazardous Materials
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Dissolved organic matter (DOM) released from forest leaf litter is potentially effective for the degradation of polycyclic aromatic hydrocarbons (PAHs), yet the inherent mechanism remains insufficiently elucidated. In this study, we investigated the effects of DOM derived from Pinus elliottii and Schima superba leaf litter on the degradation of phenanthrene by the phenanthrene degrading bacterium Sphingobium sp. Phe-1. DOM from different origins and at a large range of concentrations enhanced the degradation rate of phenanthrene. DOM derived from P. elliottii leaf litter decomposed for 12 months used at a concentration of 100mg/L yielded the highest degradation rate (16.9% in 36h) and shortened the degradation time from 48h to 24h. Changes in the composition of DOM during degradation as measured by EEMs-FRI showed that proteins and tyrosine in the DOM supplied readily available nutrients that stimulated biological activity of Phe-1, increasing its growth rate and catechol 2,3-dioxygenase activity. Simultaneously, fulvic acid and humic acid in the DOM enhanced phenanthrene bioavailability by increasing the solubility and mass transfer of phenanthrene, enhancing the uptake kinetics of Phe-1, and increasing the bacteria's direct access to DOM-associated phenanthrene. Humic acid was co-metabolized by Phe-1, resulting in further stimulation of phenanthrene degradation.

ACS Style

Dan Cai; Xiuhong Yang; Shizhong Wang; Yuanqing Chao; J.L. Morel; Rongliang Qiu. Effects of dissolved organic matter derived from forest leaf litter on biodegradation of phenanthrene in aqueous phase. Journal of Hazardous Materials 2017, 324, 516 -525.

AMA Style

Dan Cai, Xiuhong Yang, Shizhong Wang, Yuanqing Chao, J.L. Morel, Rongliang Qiu. Effects of dissolved organic matter derived from forest leaf litter on biodegradation of phenanthrene in aqueous phase. Journal of Hazardous Materials. 2017; 324 ():516-525.

Chicago/Turabian Style

Dan Cai; Xiuhong Yang; Shizhong Wang; Yuanqing Chao; J.L. Morel; Rongliang Qiu. 2017. "Effects of dissolved organic matter derived from forest leaf litter on biodegradation of phenanthrene in aqueous phase." Journal of Hazardous Materials 324, no. : 516-525.