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Institute, Department or Faculty Head
01 September 2014 - 30 August 2021
This study addresses students’ perceptions of using urban green spaces (UGSs) after the easing of COVID-19 lockdown in China. We questioned whether they are still mindful of the risks from the outdoor gathering, or conversely, starting to learn the restoration benefits from the green spaces. Online self-reported surveys were distributed to the Chinese students aging from 14 to 30 who study in Hunan and Jiangsu Provinces, China. We finally obtained 608 complete and valid questionnaire forms from all participants. Their intentions of visiting UGSs were investigated based on the extended theory of planned behavior model. Structural equation modeling was employed to test the hypothesized psychological model. The results have shown good estimation performance on risk perception and perceived knowledge to explain the variances in their attitudes, social norms, and perceived behavior control. Among these three endogenous variables, the perceived behavior control owns the greatest and positive influence on the behavioral intention, inferring that controllability is crucial for students to make decisions of visiting green spaces in a post-pandemic context.
Jiayi Liu; Zhikai Peng; Xiaoxi Cai; You Peng; Jiang Li; Tao Feng. Students’ Intention of Visiting Urban Green Spaces after the COVID-19 Lockdown in China. International Journal of Environmental Research and Public Health 2021, 18, 8601 .
AMA StyleJiayi Liu, Zhikai Peng, Xiaoxi Cai, You Peng, Jiang Li, Tao Feng. Students’ Intention of Visiting Urban Green Spaces after the COVID-19 Lockdown in China. International Journal of Environmental Research and Public Health. 2021; 18 (16):8601.
Chicago/Turabian StyleJiayi Liu; Zhikai Peng; Xiaoxi Cai; You Peng; Jiang Li; Tao Feng. 2021. "Students’ Intention of Visiting Urban Green Spaces after the COVID-19 Lockdown in China." International Journal of Environmental Research and Public Health 18, no. 16: 8601.
Life course events can change household travel demand dramatically. Recent studies of car ownership have examined the impacts of life course events on the purchasing, replacing, and disposing of cars. However, with the increasing diversification of mobility tools, changing the fleet size is not the only option to adapt to the change caused by life course events. People have various options with the development of sustainable mobility tools including electric car, electric bike, and car sharing. In order to determine the impacts of life course events on car ownership and the decision of mobility tool type, a stated choice experiment was conducted. The experiment also investigated how the attributes of mobility tools related to the acceptance of them. Based on existing literature, we identified the attributes of mobility tools and several life course events which are considered to be influential in car ownership decision and new types of mobility tools choice. The error component random parameter logit model was estimated. The heterogeneity across people on current car and specific mobility tools are considered. The results indicate people incline not to sell their current car when they choose an electric bike or shared car. Regarding the life course events, baby birth increases the probability to purchase an additional car, while it decreases the probability to purchase an electric bike or joining a car sharing scheme. Moreover, the estimation of error components implies that there is unobserved heterogeneity across respondents on the sustainable mobility tools choice and the decision on household’s current car.
Gaofeng Gu; Tao Feng; Chixing Zhong; Xiaoxi Cai; Jiang Li. The Effects of Life Course Events on Car Ownership and Sustainable Mobility Tools Adoption Decisions: Results of an Error Component Random Parameter Logit Model. Sustainability 2021, 13, 6816 .
AMA StyleGaofeng Gu, Tao Feng, Chixing Zhong, Xiaoxi Cai, Jiang Li. The Effects of Life Course Events on Car Ownership and Sustainable Mobility Tools Adoption Decisions: Results of an Error Component Random Parameter Logit Model. Sustainability. 2021; 13 (12):6816.
Chicago/Turabian StyleGaofeng Gu; Tao Feng; Chixing Zhong; Xiaoxi Cai; Jiang Li. 2021. "The Effects of Life Course Events on Car Ownership and Sustainable Mobility Tools Adoption Decisions: Results of an Error Component Random Parameter Logit Model." Sustainability 13, no. 12: 6816.
Graphene materials have attracted increasing interest in water remediation. In this study, magnetic graphene oxide (MGO) was prepared through the modified Hummers method and the adsorption behaviors of cadmium were investigated. Firstly, the sorption kinetics, isotherms, as well as the effects of pH were investigated. Then, fractional factorial design (FFD) was used to optimize the effects of pH, temperature, time, initial concentration of cadmium ion and NaCl on cadmium adsorption. The results indicate that MGO could effectively remove cadmium ions from an aqueous solution and the sorption data could be described well by pseudo-second-order and Freundlich models, showing that the adsorption rate of cadmium ions on MGO is multilayer adsorption and dominated by the chemical adsorption. According to the FFD results, the maximum adsorption capacity of cadmium ions was 13.169 mg/g under the optimum condition of pH value 8, 45 °C, contact time 60 min, initial cadmium concentration of 70 mg/L and NaCl concentration of 100 mg/L. Higher levels of the pH value, temperature and initial cadmium concentration are beneficial to the adsorption process. These results are important for estimating and optimizing the removal of metal ions by MGO composite.
Hui Wang; Yiming Zhou; Xinjiang Hu; Yuan Guo; Xiaoxi Cai; Chunjie Liu; Ping Wang; Yunguo Liu. Optimization of Cadmium Adsorption by Magnetic Graphene Oxide Using a Fractional Factorial Design. International Journal of Environmental Research and Public Health 2020, 17, 6648 .
AMA StyleHui Wang, Yiming Zhou, Xinjiang Hu, Yuan Guo, Xiaoxi Cai, Chunjie Liu, Ping Wang, Yunguo Liu. Optimization of Cadmium Adsorption by Magnetic Graphene Oxide Using a Fractional Factorial Design. International Journal of Environmental Research and Public Health. 2020; 17 (18):6648.
Chicago/Turabian StyleHui Wang; Yiming Zhou; Xinjiang Hu; Yuan Guo; Xiaoxi Cai; Chunjie Liu; Ping Wang; Yunguo Liu. 2020. "Optimization of Cadmium Adsorption by Magnetic Graphene Oxide Using a Fractional Factorial Design." International Journal of Environmental Research and Public Health 17, no. 18: 6648.
Wetland in the urban or peri-urban areas has been recognized as an important component of urban ecosystems and provides ecological and environmental services. Wetland park emerged as a kind of restoration of natural wetlands in the context of increasing pressure on land and eco-environment caused by urban sprawl, which has played an essential role in providing recreational spaces/opportunities and improving social interactions. However, little research has been conducted on the theoretical formulation elaborating individuals’ perceived quality of wetland parks when people are engaging in activities therein. This study is an attempt to develop a method to measure the quality of wetland parks based on individuals’ various perceptions and attitudes. From the view of human-nature interaction, the perceived quality is hypothetically conceptualized as a composite of two dimensions, such as comfort perception and environmental satisfaction. A series of questionnaire-based surveys were conducted among respondents (N = 936) in Yanghu wetland park in Changsha, China. Based on the measured items from on-site surveys, second-order factor structural equation modeling is applied to estimate the hypothesis of a hierarchical structure for elaborating how the quality of wetland park is perceived by individual respondents. The results test the hypothesis that the quality of wetland park as a second-order theoretical construct can be conceptualized by two first-order theoretical constructs, individuals’ comfort (loading = 0.749), and environmental satisfaction (loading = 0.828). In addition, a significant influence of attitudes toward green space on the perceived quality of wetland park has been identified.
Jiang Li; Qiao Pan; You Peng; Tao Feng; Shaobo Liu; Xiaoxi Cai; Chixing Zhong; Yicheng Yin; Wenbo Lai. Perceived Quality of Urban Wetland Parks: A Second-Order Factor Structure Equation Modeling. Sustainability 2020, 12, 7204 .
AMA StyleJiang Li, Qiao Pan, You Peng, Tao Feng, Shaobo Liu, Xiaoxi Cai, Chixing Zhong, Yicheng Yin, Wenbo Lai. Perceived Quality of Urban Wetland Parks: A Second-Order Factor Structure Equation Modeling. Sustainability. 2020; 12 (17):7204.
Chicago/Turabian StyleJiang Li; Qiao Pan; You Peng; Tao Feng; Shaobo Liu; Xiaoxi Cai; Chixing Zhong; Yicheng Yin; Wenbo Lai. 2020. "Perceived Quality of Urban Wetland Parks: A Second-Order Factor Structure Equation Modeling." Sustainability 12, no. 17: 7204.
Manganese dioxide nanoparticles were loaded onto biochar prepared from rice husk to obtain a biochar-supported manganese dioxide composite (BC/MnO2). The properties of this composite were studied through various advanced characterization techniques, combined with experiments on treating aqueous solutions of tetracycline hydrochloride (TC) and doxycycline (DC). The results showed that compared with the original biochar, MnO2 nanoparticles appeared on the surface of BC/MnO2, the carbon content decreased, and the oxygen content increased. Moreover, BC/MnO2 exhibited significantly larger total pore volume and specific surface area, and the pore structure of the biochar was improved. The effect of pH on the adsorption of TC and DC by BC/MnO2 was insignificant. With an increase in the adsorbent dose, the removal rates of TC and DC increased, and the removal ability of BC/MnO2 for TC was slightly higher than that for DC. The adsorption of TC and DC on the BC/MnO2 surface conformed to the Freundlich model. Compared with the pseudo-first-order kinetic model, the pseudo-second-order kinetic model (R2 = 0.999) better fitted the adsorption data, indicating that the adsorption process is controlled by chemical adsorption. In addition, the results of adsorption-desorption experiments indicated that BC/MnO2 have excellent regeneration ability. The experimental results of this study are significant for expanding the application of biochar composites in the treatment of aqueous solution containing antibiotics.
Jiang Li; Xiaoxi Cai; Yunguo Liu; Yanling Gu; Hui Wang; Shaobo Liu; Simian Liu; Yicheng Yin; Sijia Liu. Design and Synthesis of a Biochar-Supported Nano Manganese Dioxide Composite for Antibiotics Removal From Aqueous Solution. Frontiers in Environmental Science 2020, 8, 1 .
AMA StyleJiang Li, Xiaoxi Cai, Yunguo Liu, Yanling Gu, Hui Wang, Shaobo Liu, Simian Liu, Yicheng Yin, Sijia Liu. Design and Synthesis of a Biochar-Supported Nano Manganese Dioxide Composite for Antibiotics Removal From Aqueous Solution. Frontiers in Environmental Science. 2020; 8 ():1.
Chicago/Turabian StyleJiang Li; Xiaoxi Cai; Yunguo Liu; Yanling Gu; Hui Wang; Shaobo Liu; Simian Liu; Yicheng Yin; Sijia Liu. 2020. "Design and Synthesis of a Biochar-Supported Nano Manganese Dioxide Composite for Antibiotics Removal From Aqueous Solution." Frontiers in Environmental Science 8, no. : 1.
Cr(VI) contamination has posed great threat to both the ecosystem and human health for its carcinogenic and mutagenic nature. A highly effective adsorbent for the removal of Cr(VI) was prepared and its adsorption mechanism was thoroughly discussed in this study. In detail, magnetic BiFeO3 and kenaf biochar were loaded on cross-linked chitosan to obtain chitosan-kenaf [email protected] (CKB) for improving adsorption capacity towards Cr(VI). The adsorption process of Cr(VI) onto CKB was evaluated as a function of the pH, the existence of competing ions, the initial concentration of Cr(VI) and contact time. The results show that CKB exhibits the highest adsorption capacity under the optimal pH 2.0. The presence of competing ions such as Ca2+, NO3−, SO42−, and Cl− decreases the adsorption capacity; among them, Ca2+ and NO3− show the greatest hindrance. By studying the effect of initial Cr(VI) concentration on the adsorption capacity, it was found that CKB in the solution was enough to remove Cr(VI) for all treatments (10–200 mg/L). The adsorption experimental data were well fitted with pseudo-first-order model, suggesting that chemisorption is not the dominant rate-limiting step. Freundlich isotherm model can better explain the adsorption process, indicating a non-ideal adsorption towards Cr(VI) on a heterogeneous surface of CKB. A 25-1 Fractional Factorial Design (FFD) showed that pH and initial concentration of Cr(VI) have significant influence on Cr(VI) adsorption in our reaction system. In general, excellent adsorption efficiency of CKB indicates that it may be a good candidate for the remediation of Cr(VI)-contaminating wastewater.
Daixi Zhou; Guangyu Xie; Xinjiang Hu; Xiaoxi Cai; Yunlin Zhao; Xi Hu; Qi Jin; Xiaohua Fu; Xiaofei Tan; Chong Liang; Kaiqi Lai; Hui Wang; Chunfang Tang; Hu. Coupling of kenaf Biochar and Magnetic BiFeO3 onto Cross-Linked Chitosan for Enhancing Separation Performance and Cr(VI) Ions Removal Efficiency. International Journal of Environmental Research and Public Health 2020, 17, 788 .
AMA StyleDaixi Zhou, Guangyu Xie, Xinjiang Hu, Xiaoxi Cai, Yunlin Zhao, Xi Hu, Qi Jin, Xiaohua Fu, Xiaofei Tan, Chong Liang, Kaiqi Lai, Hui Wang, Chunfang Tang, Hu. Coupling of kenaf Biochar and Magnetic BiFeO3 onto Cross-Linked Chitosan for Enhancing Separation Performance and Cr(VI) Ions Removal Efficiency. International Journal of Environmental Research and Public Health. 2020; 17 (3):788.
Chicago/Turabian StyleDaixi Zhou; Guangyu Xie; Xinjiang Hu; Xiaoxi Cai; Yunlin Zhao; Xi Hu; Qi Jin; Xiaohua Fu; Xiaofei Tan; Chong Liang; Kaiqi Lai; Hui Wang; Chunfang Tang; Hu. 2020. "Coupling of kenaf Biochar and Magnetic BiFeO3 onto Cross-Linked Chitosan for Enhancing Separation Performance and Cr(VI) Ions Removal Efficiency." International Journal of Environmental Research and Public Health 17, no. 3: 788.
Biochar obtained by pyrolysis of the fiber plant kenaf was mixed with bismuth ferrite (BiFeO3) in a chitosan-containing acetic acid solution, magnetized, and modified to prepare a chitosan-crosslinked BiFeO3/biochar coupled magnetic material. The adsorption properties of the composite were investigated using methylene blue dissolved in water, and the effects of external conditions, such as pH, methylene blue concentration, reaction time, and temperature, on the adsorption performance were studied. The adsorption data were fitted and analyzed with kinetic and isotherm models, and the results showed that the BiFeO3/biochar coupled magnetic material effectively adsorbed methylene blue. The amounts adsorbed onto this magnetic material increased with increasing initial methylene blue concentration, reaction time, and temperature, and the adsorption performance improved under neutral and alkaline conditions. The pseudo-first-order kinetic and Langmuir isotherm models satisfactorily fitted the adsorption data, showing that the adsorption of methylene blue involved both chemical and physical adsorption. The maximum adsorption capacity of methylene blue onto the BiFeO3/biochar coupled magnetic material reached 18.942 mg·g−1 at 25 °C, confirming the excellent dye binding activity of this material.
Xiaoxi Cai; Jiang Li; Yunguo Liu; Xinjiang Hu; Xiaofei Tan; Shaobo Liu; Hui Wang; Yanling Gu; Lerong Luo; Liu. Design and Preparation of Chitosan-Crosslinked Bismuth Ferrite/Biochar Coupled Magnetic Material for Methylene Blue Removal. International Journal of Environmental Research and Public Health 2019, 17, 6 .
AMA StyleXiaoxi Cai, Jiang Li, Yunguo Liu, Xinjiang Hu, Xiaofei Tan, Shaobo Liu, Hui Wang, Yanling Gu, Lerong Luo, Liu. Design and Preparation of Chitosan-Crosslinked Bismuth Ferrite/Biochar Coupled Magnetic Material for Methylene Blue Removal. International Journal of Environmental Research and Public Health. 2019; 17 (1):6.
Chicago/Turabian StyleXiaoxi Cai; Jiang Li; Yunguo Liu; Xinjiang Hu; Xiaofei Tan; Shaobo Liu; Hui Wang; Yanling Gu; Lerong Luo; Liu. 2019. "Design and Preparation of Chitosan-Crosslinked Bismuth Ferrite/Biochar Coupled Magnetic Material for Methylene Blue Removal." International Journal of Environmental Research and Public Health 17, no. 1: 6.
Biochar has been frequently applied for the treatment of heavy metals pollution in water and soil, its effect in contaminated sediments needs further research. In order to improve the ability of biochar for heavy metals immobilization in sediment, this study prepared functionalized biochar/attapulgite composite by pyrolysis of the clay attapulgite and zinc chloride pretreated rice straw biomass. Compared with the original biochar, biochar/attapulgite composite had a large increase in specific surface area, pore volume, oxygen‐containing functional groups and cation exchange capacity. Biochar could effectively improve the dispersibility of attapulgite as a matrix. The results showed that the biochar/attapulgite composite could effectively reduce the bioavailable fraction of As and Cd in the river sediment, which had a great improvement compared with the raw biochar. After the sediment was treated by different biochar/attapulgite composites, the concentrations of As and Cd in the overlying water and pore water, and the content of acid extractable and TCLP extractable As and Cd in solid phase of sediment decreased significantly. Both zinc chloride activation and attapulgite were benefit for As and Cd immobilization in sediment by biochar/attapulgite composite. The results suggested that biochar/attapulgite composite can be used as an efficient in‐situ sorbent amendments to improve the immobilization ability of the sediment to heavy metals. This article is protected by copyright. All rights reserved.
Xiaohua Wang; Yanling Gu; Xiaofei Tan; Yunguo Liu; Yahui Zhou; Xinjiang Hu; Xiaoxi Cai; Weihua Xu; Chen Zhang; Shaoheng Liu. Functionalized Biochar/Clay Composites for Reducing the Bioavailable Fraction of Arsenic and Cadmium in River Sediment. Environmental Toxicology and Chemistry 2019, 38, 2337 -2347.
AMA StyleXiaohua Wang, Yanling Gu, Xiaofei Tan, Yunguo Liu, Yahui Zhou, Xinjiang Hu, Xiaoxi Cai, Weihua Xu, Chen Zhang, Shaoheng Liu. Functionalized Biochar/Clay Composites for Reducing the Bioavailable Fraction of Arsenic and Cadmium in River Sediment. Environmental Toxicology and Chemistry. 2019; 38 (10):2337-2347.
Chicago/Turabian StyleXiaohua Wang; Yanling Gu; Xiaofei Tan; Yunguo Liu; Yahui Zhou; Xinjiang Hu; Xiaoxi Cai; Weihua Xu; Chen Zhang; Shaoheng Liu. 2019. "Functionalized Biochar/Clay Composites for Reducing the Bioavailable Fraction of Arsenic and Cadmium in River Sediment." Environmental Toxicology and Chemistry 38, no. 10: 2337-2347.
In this work, reuse probability of heavy metal-contaminated sediment for land application was discussed using a 100-day column leaching assessment under the situation of simulated acid rain. For comparison, NaCl-modified zeolite and biochar were firstly studied for their adsorption capacity for Cu, Cd, and Pb in aqueous solution, and then their stabilizing effects on the three metals in sediment-soil mixture. Characteristic results indicated that NaCl-modified zeolite had properties more conducive to metal adsorption than biochar, including higher BET surface area and more negative surface charges. Adsorption capacities of NaCl-modified zeolite fitted by Langmuir isotherm model were 24.83, 35.57, and 133.16 mg g−1 for Cu, Cd, and Pb, respectively. Leaching results demonstrated that metal concentrations in the leachates of soil receiving zeolite- or biochar-modified sediment reduced significantly after 100 days compared with that of soil receiving bare sediment. Moreover, the NaCl-modified zeolite presented a better performance in stabilizing the three metals than biochar from the BCR sequential extraction result. Therefore, stabilization of the dredged contaminated sediment by modified zeolite ensures an environmentally friendly reuse of the sediment on land and makes the sediment treatment operation-able and cost-effective.
Zhilong Peng; Jia Wen; Yunguo Liu; Guangming Zeng; Yuanjie Yi; Ying Fang; Siyu Zhang; Jiaqin Deng; Xiaoxi Cai. Heavy metal leachability in soil amended with zeolite- or biochar-modified contaminated sediment. Environmental Monitoring and Assessment 2018, 190, 751 .
AMA StyleZhilong Peng, Jia Wen, Yunguo Liu, Guangming Zeng, Yuanjie Yi, Ying Fang, Siyu Zhang, Jiaqin Deng, Xiaoxi Cai. Heavy metal leachability in soil amended with zeolite- or biochar-modified contaminated sediment. Environmental Monitoring and Assessment. 2018; 190 (12):751.
Chicago/Turabian StyleZhilong Peng; Jia Wen; Yunguo Liu; Guangming Zeng; Yuanjie Yi; Ying Fang; Siyu Zhang; Jiaqin Deng; Xiaoxi Cai. 2018. "Heavy metal leachability in soil amended with zeolite- or biochar-modified contaminated sediment." Environmental Monitoring and Assessment 190, no. 12: 751.
In this article, we synthesize graphene oxide (GO) followed by a modified Hummers method and several characterization techniques were provided. Its adsorptive activity was evaluated based on the removal of Cu(II) from an aqueous solution. External influences were taken account to further study the adsorption mechanism. Characterisation results revealed that GO was well prepared and a large amount of oxygen-containing functional groups were introduced. The Cu(II) adsorption increased with increasing the solution pH and precipitate at alkaline condition had been considered. NaCl concentration improved copper adsorption at low pH. Formate reduced copper adsorption while benzoate improved the adsorption under low pH conditions. Here, GO performed well adsorption ability to Cu(II). The external conditions represent different influences on the adsorption process. Experimental results demonstrate that GO is a promising alternative material for pollutants removal.
Hui Wang; Xinjiang Hu; Yuan Guo; Caisheng Qiu; Songhua Long; Dongmei Hao; Xiaoxi Cai; Wenwen Xu; Yufu Wang; Yunguo Liu. Removal of copper ions by few-layered graphene oxide nanosheets from aqueous solutions: external influences and adsorption mechanisms. Journal of Chemical Technology & Biotechnology 2018, 93, 2447 -2455.
AMA StyleHui Wang, Xinjiang Hu, Yuan Guo, Caisheng Qiu, Songhua Long, Dongmei Hao, Xiaoxi Cai, Wenwen Xu, Yufu Wang, Yunguo Liu. Removal of copper ions by few-layered graphene oxide nanosheets from aqueous solutions: external influences and adsorption mechanisms. Journal of Chemical Technology & Biotechnology. 2018; 93 (8):2447-2455.
Chicago/Turabian StyleHui Wang; Xinjiang Hu; Yuan Guo; Caisheng Qiu; Songhua Long; Dongmei Hao; Xiaoxi Cai; Wenwen Xu; Yufu Wang; Yunguo Liu. 2018. "Removal of copper ions by few-layered graphene oxide nanosheets from aqueous solutions: external influences and adsorption mechanisms." Journal of Chemical Technology & Biotechnology 93, no. 8: 2447-2455.
In this study, a graphene [email protected] composite (GO/TiO2) was prepared and characterized by SEM, EDX, XRD, Nitrogen adsorption-desorption isotherm, and XPS. Photocatalytic reduction and removal of Cr(VI) using this composite in aerobic atmosphere were studied under UV irradiation. The effects of pH, ferric ions, inorganic anions, and formate were investigated systematically. The Cr(VI) reduction rate decreased with increasing the solution pH. The presence of ferric ions in the system could improve the photocatalytic reduction process. The effects of SO42− and PO43− on the process were higher than the Cl− and NO3−. The formate could slightly inhibit adsorption of Cr(VI), while it could improve the Cr(VI) reduction. GO/TiO2 has good stability and it could maintain full photoreduction activity for at least three cycles. The results indicated that the GO/TiO2 can thermodynamically reduce Cr(VI) to Cr(III) under UV light. The environmental conditions and wastewater characteristics (e.g., pH, ferric ions, inorganic anions, and formate) can influence the decontamination process due to that they can affect the interactions between chromium ions and GO/TiO2 and alter the electron-transfer pathways. The results supported that the GO/TiO2 is an attractive material for removing hexavalent chromium from water using a photocatalytic process.
Xinjiang Hu; Yunlin Zhao; Hui Wang; Xiaoxi Cai; Xi Hu; Chunfang Tang; Yunguo Liu; Yuanxiu Yang. Decontamination of Cr(VI) by graphene [email protected] in an aerobic atmosphere: effects of pH, ferric ions, inorganic anions, and formate. Journal of Chemical Technology & Biotechnology 2018, 93, 2226 -2233.
AMA StyleXinjiang Hu, Yunlin Zhao, Hui Wang, Xiaoxi Cai, Xi Hu, Chunfang Tang, Yunguo Liu, Yuanxiu Yang. Decontamination of Cr(VI) by graphene [email protected] in an aerobic atmosphere: effects of pH, ferric ions, inorganic anions, and formate. Journal of Chemical Technology & Biotechnology. 2018; 93 (8):2226-2233.
Chicago/Turabian StyleXinjiang Hu; Yunlin Zhao; Hui Wang; Xiaoxi Cai; Xi Hu; Chunfang Tang; Yunguo Liu; Yuanxiu Yang. 2018. "Decontamination of Cr(VI) by graphene [email protected] in an aerobic atmosphere: effects of pH, ferric ions, inorganic anions, and formate." Journal of Chemical Technology & Biotechnology 93, no. 8: 2226-2233.
BACKGROUND This article reports the synthesis and characterisation of titanium dioxide‐coated biochar composites (TBCs) by pyrolysing titanium dioxide‐treated biomass prepared by a modified sol–gel method. Their adsorptive and photocatalytic activities were evaluated based on the removal of safranine T (ST) from an aqueous solution with/without UV‐light irradiation. RESULTS Characterisation studies suggested that TiO2 was successfully loaded on the biochar substrate. The biochar and TiO2 contents of the composite significantly affected its performance. The ST removal capabilities of the TBCs with 1, 1.5, 2, and 2.5 g of the biomass are 1.7, 2.3, 7.2, and 2.3 times better than that of the raw biochar, respectively. Thus, the optimum amount of biomass in TBC‐x was determined to be 2 g, with the corresponding sample exhibiting excellent stability, effectiveness over a wide pH range, and a maximum ST removal capacity of 226.7 mg g‐1. CONCLUSION The loading of TiO2 significantly enhanced the adsorption performance of biochar and the high specific surface area of the biochar synergistically promoted the photocatalytic activity of TiO2. Both adsorption and photocatalytic degradation were confirmed to contribute to the decolourisation of the aqueous solution because of the removal of ST, with the effect of adsorption being slightly higher than that of photocatalysis. The synthesised composite is a promising alternative material for removing chemical contaminants. © 2017 Society of Chemical Industry
Xiaoxi Cai; Jiang Li; Yunguo Liu; Zhili Yan; Xiaofei Tan; Shaobo Liu; Guangming Zeng; Yanling Gu; Xinjiang Hu; Luhua Jiang. Titanium dioxide‐coated biochar composites as adsorptive and photocatalytic degradation materials for the removal of aqueous organic pollutants. Journal of Chemical Technology & Biotechnology 2017, 93, 783 -791.
AMA StyleXiaoxi Cai, Jiang Li, Yunguo Liu, Zhili Yan, Xiaofei Tan, Shaobo Liu, Guangming Zeng, Yanling Gu, Xinjiang Hu, Luhua Jiang. Titanium dioxide‐coated biochar composites as adsorptive and photocatalytic degradation materials for the removal of aqueous organic pollutants. Journal of Chemical Technology & Biotechnology. 2017; 93 (3):783-791.
Chicago/Turabian StyleXiaoxi Cai; Jiang Li; Yunguo Liu; Zhili Yan; Xiaofei Tan; Shaobo Liu; Guangming Zeng; Yanling Gu; Xinjiang Hu; Luhua Jiang. 2017. "Titanium dioxide‐coated biochar composites as adsorptive and photocatalytic degradation materials for the removal of aqueous organic pollutants." Journal of Chemical Technology & Biotechnology 93, no. 3: 783-791.
This paper explored biochar modification to enhance biochar’s ability to adsorb hexavalent chromium from aqueous solution. The ramie stem biomass was pyrolyzed and then treated by β-cyclodextrin/poly(L-glutamic acid) which contained plentiful functional groups. The pristine and modified biochar were characterized by FTIR, X-ray photoelectron spectroscopy, specific surface area, and zeta potential measurement. Results indicated that the β-cyclodextrin/poly(L-glutamic acid) was successfully bound to the biochar surface. Batch experiments were conducted to investigate the kinetics, isotherm, thermodynamics, and adsorption/desorption of Cr(VI). Adsorption capacities of CGA-biochar were significantly higher than that of the untreated biochar, and its maximum adsorption capacity could reach up to 197.21 mg/g at pH 2.0. Results also illustrated that sorption performance depended on initial solution pH; in addition, acidic condition was beneficial to the Cr(VI) uptake. Furthermore, the Cr(VI) uptake was significantly affected by the ion strength and cation species. This study demonstrated that CGA-biochar could be a potential adsorbent for Cr(VI) pollution control.
Luhua Jiang; Shaobo Liu; Yunguo Liu; Guangming Zeng; Yiming Guo; Yicheng Yin; Xiaoxi Cai; Lu Zhou; Xiaofei Tan; Xixian Huang. Enhanced adsorption of hexavalent chromium by a biochar derived from ramie biomass (Boehmeria nivea (L.) Gaud.) modified with β-cyclodextrin/poly(L-glutamic acid). Environmental Science and Pollution Research 2017, 24, 23528 -23537.
AMA StyleLuhua Jiang, Shaobo Liu, Yunguo Liu, Guangming Zeng, Yiming Guo, Yicheng Yin, Xiaoxi Cai, Lu Zhou, Xiaofei Tan, Xixian Huang. Enhanced adsorption of hexavalent chromium by a biochar derived from ramie biomass (Boehmeria nivea (L.) Gaud.) modified with β-cyclodextrin/poly(L-glutamic acid). Environmental Science and Pollution Research. 2017; 24 (30):23528-23537.
Chicago/Turabian StyleLuhua Jiang; Shaobo Liu; Yunguo Liu; Guangming Zeng; Yiming Guo; Yicheng Yin; Xiaoxi Cai; Lu Zhou; Xiaofei Tan; Xixian Huang. 2017. "Enhanced adsorption of hexavalent chromium by a biochar derived from ramie biomass (Boehmeria nivea (L.) Gaud.) modified with β-cyclodextrin/poly(L-glutamic acid)." Environmental Science and Pollution Research 24, no. 30: 23528-23537.
In this study, the effect factors and mechanisms of doxycycline hydrochloride (DOX) adsorption on copper nitrate modified biochar (Cu-BC) was investigated. Cu-BC absorbent was synthesized through calcination of peanut shells biomass at 450°C and then impregnation with copper nitrate. The Cu-BC has exhibited excellent sorption efficiency about 93.22% of doxycycline hydrochloride from aqueous solution, which was double higher than that of the unmodified biochar. The experimental results suggest that the adsorption efficiency of DOX on the Cu-BC is dominated by the strong complexation, electrostatic interactions between DOX molecules and the Cu-BC samples. Comprehensively considering the cost, efficiency and the application to realistic water, the Cu-BC hold the significant potential for enhancing the effectiveness to remove DOX from water.
Su Liu; Wei-Hua Xu; Yun-Guo Liu; Xiaofei Tan; Guang-Ming Zeng; Xin Li; Jie Liang; Zan Zhou; Zhi-Li Yan; Xiaoxi Cai. Facile synthesis of Cu(II) impregnated biochar with enhanced adsorption activity for the removal of doxycycline hydrochloride from water. Science of The Total Environment 2017, 592, 546 -553.
AMA StyleSu Liu, Wei-Hua Xu, Yun-Guo Liu, Xiaofei Tan, Guang-Ming Zeng, Xin Li, Jie Liang, Zan Zhou, Zhi-Li Yan, Xiaoxi Cai. Facile synthesis of Cu(II) impregnated biochar with enhanced adsorption activity for the removal of doxycycline hydrochloride from water. Science of The Total Environment. 2017; 592 ():546-553.
Chicago/Turabian StyleSu Liu; Wei-Hua Xu; Yun-Guo Liu; Xiaofei Tan; Guang-Ming Zeng; Xin Li; Jie Liang; Zan Zhou; Zhi-Li Yan; Xiaoxi Cai. 2017. "Facile synthesis of Cu(II) impregnated biochar with enhanced adsorption activity for the removal of doxycycline hydrochloride from water." Science of The Total Environment 592, no. : 546-553.
Mei-Fang Li; Yun-Guo Liu; Shao-Bo Liu; Ding Shu; Guang-Ming Zeng; Xin-Jiang Hu; Xiaofei Tan; Lu-Hua Jiang; Zhi-Li Yan; Xiaoxi Cai. Cu(II)-influenced adsorption of ciprofloxacin from aqueous solutions by magnetic graphene oxide/nitrilotriacetic acid nanocomposite: Competition and enhancement mechanisms. Chemical Engineering Journal 2017, 319, 219 -228.
AMA StyleMei-Fang Li, Yun-Guo Liu, Shao-Bo Liu, Ding Shu, Guang-Ming Zeng, Xin-Jiang Hu, Xiaofei Tan, Lu-Hua Jiang, Zhi-Li Yan, Xiaoxi Cai. Cu(II)-influenced adsorption of ciprofloxacin from aqueous solutions by magnetic graphene oxide/nitrilotriacetic acid nanocomposite: Competition and enhancement mechanisms. Chemical Engineering Journal. 2017; 319 ():219-228.
Chicago/Turabian StyleMei-Fang Li; Yun-Guo Liu; Shao-Bo Liu; Ding Shu; Guang-Ming Zeng; Xin-Jiang Hu; Xiaofei Tan; Lu-Hua Jiang; Zhi-Li Yan; Xiaoxi Cai. 2017. "Cu(II)-influenced adsorption of ciprofloxacin from aqueous solutions by magnetic graphene oxide/nitrilotriacetic acid nanocomposite: Competition and enhancement mechanisms." Chemical Engineering Journal 319, no. : 219-228.
Zhi-Li Yan; Yun-Guo Liu; Xiao-Fei Tan; Shao-Bo Liu; Guang-Ming Zeng; Lu-Hua Jiang; Mei-Fang Li; Zan Zhou; Su Liu; Xiao-Xi Cai. Immobilization of aqueous and sediment-sorbed ciprofloxacin by stabilized Fe-Mn binary oxide nanoparticles: Influencing factors and reaction mechanisms. Chemical Engineering Journal 2017, 314, 612 -621.
AMA StyleZhi-Li Yan, Yun-Guo Liu, Xiao-Fei Tan, Shao-Bo Liu, Guang-Ming Zeng, Lu-Hua Jiang, Mei-Fang Li, Zan Zhou, Su Liu, Xiao-Xi Cai. Immobilization of aqueous and sediment-sorbed ciprofloxacin by stabilized Fe-Mn binary oxide nanoparticles: Influencing factors and reaction mechanisms. Chemical Engineering Journal. 2017; 314 ():612-621.
Chicago/Turabian StyleZhi-Li Yan; Yun-Guo Liu; Xiao-Fei Tan; Shao-Bo Liu; Guang-Ming Zeng; Lu-Hua Jiang; Mei-Fang Li; Zan Zhou; Su Liu; Xiao-Xi Cai. 2017. "Immobilization of aqueous and sediment-sorbed ciprofloxacin by stabilized Fe-Mn binary oxide nanoparticles: Influencing factors and reaction mechanisms." Chemical Engineering Journal 314, no. : 612-621.
Zan Zhou; Yun-Guo Liu; Shao-Bo Liu; Hong-Yu Liu; Guang-Ming Zeng; Xiaofei Tan; Chun-Ping Yang; Yang Ding; Zhi-Li Yan; Xiaoxi Cai. Sorption performance and mechanisms of arsenic(V) removal by magnetic gelatin-modified biochar. Chemical Engineering Journal 2017, 314, 223 -231.
AMA StyleZan Zhou, Yun-Guo Liu, Shao-Bo Liu, Hong-Yu Liu, Guang-Ming Zeng, Xiaofei Tan, Chun-Ping Yang, Yang Ding, Zhi-Li Yan, Xiaoxi Cai. Sorption performance and mechanisms of arsenic(V) removal by magnetic gelatin-modified biochar. Chemical Engineering Journal. 2017; 314 ():223-231.
Chicago/Turabian StyleZan Zhou; Yun-Guo Liu; Shao-Bo Liu; Hong-Yu Liu; Guang-Ming Zeng; Xiaofei Tan; Chun-Ping Yang; Yang Ding; Zhi-Li Yan; Xiaoxi Cai. 2017. "Sorption performance and mechanisms of arsenic(V) removal by magnetic gelatin-modified biochar." Chemical Engineering Journal 314, no. : 223-231.
A novel magnetic nanomaterial was synthesized by grafting nitrilotriacetic acid to magnetic graphene oxide (NDMGO), which was applied as an adsorbent for removing tetracycline (TC) from aqueous solutions. The nanomaterial was characterized using TG-DTA, SEM, TEM, XRD, VSM, XPS, Raman, BET surface area and zeta potential measurements. Several experimental conditions (solution pH, adsorption time, temperature, ionic strength and foreign ions) affecting the adsorption process were investigated. The results showed that the TC adsorption capacity could be affected by solution pH. The adsorption capacity of TC increased rapidly in the initial 20min and finally reached equilibrium was about 600min. The pseudo-second-order kinetics provided the better correlation for the experiment data. Various thermodynamic parameters indicated that the adsorption was a spontaneous and endothermic process. The presence of NaCl and background electrolytes in the solution had a slight influence on TC adsorption. Hydrogen bonds, amidation reaction, π-π and cation-π interaction between NDMGO and TC could be used to explain the adsorption mechanism. The regeneration experiment demonstrated that this nanomaterial possessed an excellent regeneration performance. Based on the experimental results and comparative analysis with other adsorbents, the NDMGO was a high-efficiency and reusable adsorbent for TC pollution control.
Mei-Fang Li; Yun-Guo Liu; Guang-Ming Zeng; Shao-Bo Liu; Xin-Jiang Hu; Ding Shu; Lu-Hua Jiang; Xiao-Fei Tan; Xiaoxi Cai; Zhi-Li Yan. Tetracycline absorbed onto nitrilotriacetic acid-functionalized magnetic graphene oxide: Influencing factors and uptake mechanism. Journal of Colloid and Interface Science 2017, 485, 269 -279.
AMA StyleMei-Fang Li, Yun-Guo Liu, Guang-Ming Zeng, Shao-Bo Liu, Xin-Jiang Hu, Ding Shu, Lu-Hua Jiang, Xiao-Fei Tan, Xiaoxi Cai, Zhi-Li Yan. Tetracycline absorbed onto nitrilotriacetic acid-functionalized magnetic graphene oxide: Influencing factors and uptake mechanism. Journal of Colloid and Interface Science. 2017; 485 ():269-279.
Chicago/Turabian StyleMei-Fang Li; Yun-Guo Liu; Guang-Ming Zeng; Shao-Bo Liu; Xin-Jiang Hu; Ding Shu; Lu-Hua Jiang; Xiao-Fei Tan; Xiaoxi Cai; Zhi-Li Yan. 2017. "Tetracycline absorbed onto nitrilotriacetic acid-functionalized magnetic graphene oxide: Influencing factors and uptake mechanism." Journal of Colloid and Interface Science 485, no. : 269-279.
A biochar supported calcined-Mg/Al layered double hydroxides composite (CLDHs/BC) was synthesized by a one-pot slow pyrolysis of LDHs preloaded bagasse biomass. Multiple characterizations of the product illustrated that the calcined-Mg/Al layered double hydroxides (CLDHs) were successfully coated onto the biochar in slow pyrolysis of pre-treated biomass. The as-synthesized CLDHs/BC could efficiently remove antibiotic tetracycline from aqueous solutions. The coating of CLDHs significantly increased the adsorption ability of biochar, and CLDHs/BC exhibited more than 2 times higher adsorption capacity than that of the pristine biochar (BC) in the tested pH range. The maximum adsorption capacity of CLDHs/BC for tetracycline was 1118.12 mg/g at 318 K. The experimental results suggested that the interaction with LDHs on biochar played a dominant role in tetracycline adsorption, accompanied with π–π interaction and hydrogen bond. This study provides a feasible and simple approach for the preparation of high-performance material for antibiotics contaminated wastewater treatment in a cost-effective way.
Xiaofei Tan; Shaobo Liu; Yunguo Liu; Yanling Gu; Guangming Zeng; Xiaoxi Cai; Zhili Yan; Chunping Yang; Xinjiang Hu; Bo Chen. One-pot synthesis of carbon supported calcined-Mg/Al layered double hydroxides for antibiotic removal by slow pyrolysis of biomass waste. Scientific Reports 2016, 6, 39691 .
AMA StyleXiaofei Tan, Shaobo Liu, Yunguo Liu, Yanling Gu, Guangming Zeng, Xiaoxi Cai, Zhili Yan, Chunping Yang, Xinjiang Hu, Bo Chen. One-pot synthesis of carbon supported calcined-Mg/Al layered double hydroxides for antibiotic removal by slow pyrolysis of biomass waste. Scientific Reports. 2016; 6 (1):39691.
Chicago/Turabian StyleXiaofei Tan; Shaobo Liu; Yunguo Liu; Yanling Gu; Guangming Zeng; Xiaoxi Cai; Zhili Yan; Chunping Yang; Xinjiang Hu; Bo Chen. 2016. "One-pot synthesis of carbon supported calcined-Mg/Al layered double hydroxides for antibiotic removal by slow pyrolysis of biomass waste." Scientific Reports 6, no. 1: 39691.
A novel biochar/MgAl-layered double hydroxides composite (CB-LDH) was prepared for the removal of crystal violet from aqueous solution by pyrolyzing MgAl-LDH pre-coated ramie stem (Boehmeria nivea (L.) Gaud.). Pyrolysis played dual role for both converting biomass into biochar and calcining MgAl-LDH during the pyrolysis process. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray analysis (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) and zeta potential analysis were used to characterize the CB-LDH. The results of characterization suggested that the calcined LDH was successfully synthesized and coated on biochar. The resulted CB-LDH had higher total pore volume and more functional groups than the pristine biochar. Adsorption experimental data fitted well with the pseudo-second order kinetics model and the Freundlich isotherm model. The rate-controlled step was controlled by film-diffusion initially and then followed by intra-particle diffusion. Thermodynamic analysis showed that the adsorption of crystal violet was a spontaneous and endothermic process. The higher pH and temperature of the solution enhanced the adsorption performance. CB-LDH could also have excellent ability for the removal of crystal violet from the actual industrial wastewater and groundwater with high ionic strength. LDH adsorption, electrostatic attraction, pore-filling, π-π interaction and hydrogen bond might be the main mechanisms for crystal violet adsorption on CB-LDH. The results of this study indicated that CB-LDH is a sustainable and green adsorbent with high performance for crystal violet contaminated wastewater treatment and groundwater remediation.
Xiaofei Tan; Yun-Guo Liu; Yan-Ling Gu; Shao-Bo Liu; Guang-Ming Zeng; Xiaoxi Cai; Xin-Jiang Hu; Hui Wang; Si-Mian Liu; Lu-Hua Jiang. Biochar pyrolyzed from MgAl-layered double hydroxides pre-coated ramie biomass (Boehmeria nivea (L.) Gaud.): Characterization and application for crystal violet removal. Journal of Environmental Management 2016, 184, 85 -93.
AMA StyleXiaofei Tan, Yun-Guo Liu, Yan-Ling Gu, Shao-Bo Liu, Guang-Ming Zeng, Xiaoxi Cai, Xin-Jiang Hu, Hui Wang, Si-Mian Liu, Lu-Hua Jiang. Biochar pyrolyzed from MgAl-layered double hydroxides pre-coated ramie biomass (Boehmeria nivea (L.) Gaud.): Characterization and application for crystal violet removal. Journal of Environmental Management. 2016; 184 ():85-93.
Chicago/Turabian StyleXiaofei Tan; Yun-Guo Liu; Yan-Ling Gu; Shao-Bo Liu; Guang-Ming Zeng; Xiaoxi Cai; Xin-Jiang Hu; Hui Wang; Si-Mian Liu; Lu-Hua Jiang. 2016. "Biochar pyrolyzed from MgAl-layered double hydroxides pre-coated ramie biomass (Boehmeria nivea (L.) Gaud.): Characterization and application for crystal violet removal." Journal of Environmental Management 184, no. : 85-93.