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To reduce the eutrophication caused by nitrogen and phosphorus in water, invasive plant Eupatorium adenophorum was used to prepare biochar under different pyrolysis temperatures for the co-adsorption of nitrogen and phosphorus. The influencing factors of the co-adsorption of ammonium and phosphate onto EBC and its adsorption mechanism were systematically studied. The results show that Eupatorium adenophorum biochar (EBC) has rich functional groups and high specific surface area. Low pyrolysis temperature (300°C) and alkaline conditions are beneficial for the co-adsorption. The adsorption of ammonium and phosphate by EBC is more in line with the pseudo-second-order kinetics and Langmuir-Freundlich model (Qmax is 2.32 mg P/g and 1.909 mg N/g). Site energy analysis further confirms that electrostatic attraction is the main mechanism. This study shows that EBC could be used as a low-cost and effective adsorbent to simultaneously remove ammonium and phosphate from water, providing a method for resource utilization of invasive plants.
Ning Cheng; Bing Wang; Qianwei Feng; Xueyang Zhang; Miao Chen. Co-adsorption performance and mechanism of nitrogen and phosphorus onto eupatorium adenophorum biochar in water. Bioresource Technology 2021, 340, 125696 .
AMA StyleNing Cheng, Bing Wang, Qianwei Feng, Xueyang Zhang, Miao Chen. Co-adsorption performance and mechanism of nitrogen and phosphorus onto eupatorium adenophorum biochar in water. Bioresource Technology. 2021; 340 ():125696.
Chicago/Turabian StyleNing Cheng; Bing Wang; Qianwei Feng; Xueyang Zhang; Miao Chen. 2021. "Co-adsorption performance and mechanism of nitrogen and phosphorus onto eupatorium adenophorum biochar in water." Bioresource Technology 340, no. : 125696.
The resource utilization of industrial solid waste has become a hot issue worldwide. Composites of biochar with metal-rich industrial solid wastes (MCSWs) can not only improve the adsorption performance, but also reduce the cost of modification and promote the recycling of waste resources. Thus, the synthesis and applications of biochar composites modified by MCSWs have been attracting increasing attention. However, different MCSWs may result in metal-containing solid waste/biochar composites (MCSW-BCs) with various physicochemical properties and adsorption performance, causing distinct adsorption mechanisms and applications. Although a lot of researches have been carried out, it is still in infancy. In particular, the explanation on the adsorption mechanisms and influencing factors of pollutant onto MCSW-BCs are not comprehensive and clear enough. Therefore, a systematic review on fabrication and potential environmental applications of different MCSW-BCs is highly needed. Here we summarize the recent advances on the utilization of typical metal-containing solid wastes, preparation of MCSW-BCs, adsorption mechanisms and influencing factors of pollutants by MCSW-BCs as well as their environmental applications. Finally, comments and perspectives for future studies are proposed.
Ruohan Zhao; Bing Wang; Benny K.G. Theng; Pan Wu; Fang Liu; Xinqing Lee; Miao Chen; Jing Sun. Fabrication and environmental applications of metal-containing solid waste/biochar composites: A review. Science of The Total Environment 2021, 799, 149295 .
AMA StyleRuohan Zhao, Bing Wang, Benny K.G. Theng, Pan Wu, Fang Liu, Xinqing Lee, Miao Chen, Jing Sun. Fabrication and environmental applications of metal-containing solid waste/biochar composites: A review. Science of The Total Environment. 2021; 799 ():149295.
Chicago/Turabian StyleRuohan Zhao; Bing Wang; Benny K.G. Theng; Pan Wu; Fang Liu; Xinqing Lee; Miao Chen; Jing Sun. 2021. "Fabrication and environmental applications of metal-containing solid waste/biochar composites: A review." Science of The Total Environment 799, no. : 149295.
Photocatalytic degradation of sulfamonomethoxine (SMM) by mesoporous phosphorus-doped TiO2 (P–TiO2) was studied under simulated solar light irradiation. The morphological structure and chemical composition of P–TiO2 were analyzed by XRD, SEM, HRTEM, BET, XPS and FTIR. Using the central composite design (CCD) of response surface methodology (RSM), the degradation of SMM was investigated with a range of antibiotic concentrations (4–8 mg L−1), catalyst dosages (400–900 mg L−1), P doping amounts (5–15 wt %) and irradiation time (90–150 min). The Ti–O–P bond formed during the calcination of TiO2, thereby generating plate-like P–TiO2, where P was uniformly distributed. Phosphorus doping can stabilize anatase TiO2, which has a larger specific surface area and a lower average particle and pore size than bare TiO2. The result obtained from the RSM model showed a significant correlation between the predicted values and the experimental results of SMM degradation (P < 0.05). Under the optimal experimental conditions (antibiotic concentration = 6 mg/L, catalyst dosage = 800 mg/L, P doping = 5 wt% and irradiation time = 90 min), the degradation rate of SMM was 99.51%, and the TOC was 50%. Toxicity showed a considerable reduction towards Vibrio-qinghaiensis sp.-Q67 after SMM photocatalytic degradation. Through free radical capture experiments, LC-MS detection and DFT calculations, the possible photocatalytic degradation mechanism of SMM using P–TiO2 as the catalyst was revealed.
Jiang Li; Qi Su; Huayu Yuan; Lin Zhang; Li'an Hou; Yuehu Wang; Baojun Liu; Bing Wang; Yancheng Li. Photocatalytic degradation of sulfamonomethoxine by mesoporous phosphorus-doped titania under simulated solar light irradiation. Chemosphere 2021, 285, 131553 .
AMA StyleJiang Li, Qi Su, Huayu Yuan, Lin Zhang, Li'an Hou, Yuehu Wang, Baojun Liu, Bing Wang, Yancheng Li. Photocatalytic degradation of sulfamonomethoxine by mesoporous phosphorus-doped titania under simulated solar light irradiation. Chemosphere. 2021; 285 ():131553.
Chicago/Turabian StyleJiang Li; Qi Su; Huayu Yuan; Lin Zhang; Li'an Hou; Yuehu Wang; Baojun Liu; Bing Wang; Yancheng Li. 2021. "Photocatalytic degradation of sulfamonomethoxine by mesoporous phosphorus-doped titania under simulated solar light irradiation." Chemosphere 285, no. : 131553.
Biochar, a carbon-rich material, has been widely used to adsorb a range of pollutants because of its low cost, large specific surface area (SSA), and high ion exchange capacity. The adsorption capacity of biochar, however, is limited by its small porosity and low content of surface functional groups. Nano-metal oxides have a large SSA and high surface energy but tend to aggregate and passivate because of their fine-grained nature. In combining the positive qualities of both biochar and nano-metal oxides, nano-metal oxide-biochar composites (NMOBCs) have emerged as a group of effective and novel adsorbents. NMOBCs improve the dispersity and stability of nano-metal oxides, rich in adsorption sites and surface functional groups, maximize the adsorption capacity of biochar and nano-metal oxides respectively. Since the adsorption capacity and mechanisms of NMOBCs vary greatly amongst different preparations and application conditions, there is a need for a review of NMOBCs. Herein we firstly summarize the recent methods of preparing NMOBCs, the factors influencing their efficacy in the removal of several pollutants, mechanisms underlying the adsorption of different pollutants, and their potential applications for pollution control. Recommendations and suggestions for future studies on NMOBCs are also proposed.
Chenxi Zhao; Bing Wang; Benny K.G. Theng; Pan Wu; Fang Liu; Shengsen Wang; Xinqing Lee; Miao Chen; Ling Li; Xueyang Zhang. Formation and mechanisms of nano-metal oxide-biochar composites for pollutants removal: A review. Science of The Total Environment 2021, 767, 145305 .
AMA StyleChenxi Zhao, Bing Wang, Benny K.G. Theng, Pan Wu, Fang Liu, Shengsen Wang, Xinqing Lee, Miao Chen, Ling Li, Xueyang Zhang. Formation and mechanisms of nano-metal oxide-biochar composites for pollutants removal: A review. Science of The Total Environment. 2021; 767 ():145305.
Chicago/Turabian StyleChenxi Zhao; Bing Wang; Benny K.G. Theng; Pan Wu; Fang Liu; Shengsen Wang; Xinqing Lee; Miao Chen; Ling Li; Xueyang Zhang. 2021. "Formation and mechanisms of nano-metal oxide-biochar composites for pollutants removal: A review." Science of The Total Environment 767, no. : 145305.
Emerging contaminants (ECs), a group of relatively low-concentration but high-toxicity pollutants in the environment, have attracted widespread attention in recent years. These trace pollutants can be enriched in organisms and finally transferred to human bodies, posing a potential hazard to public health. Biochar, a low-cost and high-efficiency adsorbent, has been used to treat ECs in water. However, due to certain limitations of pristine biochar, such as poor adsorption capacity, narrow adsorption range, and other shortcomings, it is necessary to modify biochar to improve its applications in water treatment for ECs. Currently, there are a lot of reports on the removal of ECs from water by modified biochar. These studies explored different modification methods to functionalize biochar with various physicochemical properties, which resulted in distinct adsorption effects, behaviors and mechanisms of modified biochar on different ECs. There is a need to systematically review and digest the knowledge on the adsorption of ECs on modified biochar. In this review, recent biochar modification methods used in ECs removal are firstly summarized, and the adsorption performance and mechanisms of modified biochar on typical ECs are then systematically reviewed. Finally, the main research directions and trends, as well as recommendations and suggestions for future development are pointed out.
Ning Cheng; Bing Wang; Pan Wu; Xinqing Lee; Ying Xing; Miao Chen; Bin Gao. Adsorption of emerging contaminants from water and wastewater by modified biochar: A review. Environmental Pollution 2021, 273, 116448 .
AMA StyleNing Cheng, Bing Wang, Pan Wu, Xinqing Lee, Ying Xing, Miao Chen, Bin Gao. Adsorption of emerging contaminants from water and wastewater by modified biochar: A review. Environmental Pollution. 2021; 273 ():116448.
Chicago/Turabian StyleNing Cheng; Bing Wang; Pan Wu; Xinqing Lee; Ying Xing; Miao Chen; Bin Gao. 2021. "Adsorption of emerging contaminants from water and wastewater by modified biochar: A review." Environmental Pollution 273, no. : 116448.
To explore the feasibility of biochar for reducing mobility and bioavailability of heavy metals in different contaminated soils, batch incubation experiments including column leaching and pot experiments were conducted to investigate the effects of biochar input on soil pH, the bioavailability of heavy metals (Cd, Zn, and Pb) and their species in three different contaminated soils treated with different swine biochar application rates. The results show that biochar has more potential for pH improvement in acidic soils than neutral and alkaline soil. After 42 d incubation, the pH values of the acidic soils increased from 5.90 to 7.23, while the pH values of neutral/alkaline soils did not change significantly. The available heavy metals showed a decreasing trend as the biochar application rate increases. The order of the immobilization effect is Pb>Zn>Cd. Possible immobilization mechanisms are mainly ion exchange, complexation, π bond action and precipitation on the surface of biochar.
Fang Yang; Bing Wang; Zeming Shi; Ling Li; Yang Li; Zhiqiang Mao; Luyun Liao; Heng Zhang; Yang Wu. Immobilization of heavy metals (Cd, Zn, and Pb) in different contaminated soils with swine manure biochar. Environmental Pollutants and Bioavailability 2021, 33, 55 -65.
AMA StyleFang Yang, Bing Wang, Zeming Shi, Ling Li, Yang Li, Zhiqiang Mao, Luyun Liao, Heng Zhang, Yang Wu. Immobilization of heavy metals (Cd, Zn, and Pb) in different contaminated soils with swine manure biochar. Environmental Pollutants and Bioavailability. 2021; 33 (1):55-65.
Chicago/Turabian StyleFang Yang; Bing Wang; Zeming Shi; Ling Li; Yang Li; Zhiqiang Mao; Luyun Liao; Heng Zhang; Yang Wu. 2021. "Immobilization of heavy metals (Cd, Zn, and Pb) in different contaminated soils with swine manure biochar." Environmental Pollutants and Bioavailability 33, no. 1: 55-65.
To solve the problem of limited adsorption efficiency of pristine biochar for phosphate, a novel biochar composite was prepared from different feedstocks and coal gangue by one facile-step pyrolysis method. The effects of pyrolysis temperature, adsorbent dosage, pH of the solution, and coexisting ions on phosphate adsorption were analyzed. The adsorption performance and mechanism of phosphate in water were investigated. The application of the phosphorus-laden (P-laden) composite as slow-release fertilizer was evaluated by a germination test. The results showed that the maximum phosphate adsorption capacity of coal gangue modified oilseed rape straw biochar prepared at 700 °C (CG-OR700) was 7.9 mg/g at pH 4.0, which is 4.6 times that of pristine biochar. The adsorption process can be well fitted by the pseudo-second-order kinetic and Langmuir isotherm adsorption model. The mechanism of phosphate adsorption mainly includes surface precipitation, ligand exchange, and electrostatic attraction. The P-laden biochar can be used as a slow-release fertilizer to promote seed germination and growth. This study shows that the coal gangue modified biochar composite can not only be used to remove phosphate from wastewater, but also be used as a slow-release fertilizer, providing a new way for the phosphorus recovery and resource utilization of solid wastes.
Bing Wang; Yuena Ma; Xinqing Lee; Pan Wu; Fang Liu; Xueyang Zhang; Ling Li; Miao Chen. Environmental-friendly coal gangue-biochar composites reclaiming phosphate from water as a slow-release fertilizer. Science of The Total Environment 2020, 758, 143664 .
AMA StyleBing Wang, Yuena Ma, Xinqing Lee, Pan Wu, Fang Liu, Xueyang Zhang, Ling Li, Miao Chen. Environmental-friendly coal gangue-biochar composites reclaiming phosphate from water as a slow-release fertilizer. Science of The Total Environment. 2020; 758 ():143664.
Chicago/Turabian StyleBing Wang; Yuena Ma; Xinqing Lee; Pan Wu; Fang Liu; Xueyang Zhang; Ling Li; Miao Chen. 2020. "Environmental-friendly coal gangue-biochar composites reclaiming phosphate from water as a slow-release fertilizer." Science of The Total Environment 758, no. : 143664.
Invasive plants harm ecosystems and human health due to their strong environmental adaptability, fast reproduction and spreading capabilities. Management of invasive plants, therefore, attracted more and more attention recently. Biochar is a carbon-rich solid substance formed by pyrolyzing organic substances under low or limited oxygen conditions. It has high aromaticity and strong resistance to decomposition and is widely used in agriculture, environment, energy, and other fields. As a special raw material, the high diversity and wide distribution make invasive plants ideal feedstocks for biochar production. Pyrolysis of invasive plants to prepare biochar not only realizes the protection of ecosystemsbut also benefits human health. In addition, compared with traditional biochar, invasive plant-derived biochar (IP-DB) showed significant differences in structure, composition, and adsorption performance. As an economical and easily available adsorbent, IP-DB has been gradually used in environmental remediation and agricultural soil amendment, but there are relatively few reports compared with other types of biochar, and the research is scattered. Therefore, it is necessary to review the potential of invasive plants to prepare biochar and its application value. Here we make a review on current research status of invasive plants, focusing on their potential for biochar productions and applications. Based on these reviews, we proposed possible future development in this research field, which could serve as theoretical basis for further researches.
Qianwei Feng; Bing Wang; Miao Chen; Pan Wu; Xinqing Lee; Ying Xing. Invasive plants as potential sustainable feedstocks for biochar production and multiple applications: A review. Resources, Conservation and Recycling 2020, 164, 105204 .
AMA StyleQianwei Feng, Bing Wang, Miao Chen, Pan Wu, Xinqing Lee, Ying Xing. Invasive plants as potential sustainable feedstocks for biochar production and multiple applications: A review. Resources, Conservation and Recycling. 2020; 164 ():105204.
Chicago/Turabian StyleQianwei Feng; Bing Wang; Miao Chen; Pan Wu; Xinqing Lee; Ying Xing. 2020. "Invasive plants as potential sustainable feedstocks for biochar production and multiple applications: A review." Resources, Conservation and Recycling 164, no. : 105204.
To assess the effect of zinc smelting on environment and human health, the concentration, distribution, sources and health risk of eight heavy metals (Pb, Cd, Cu, Zn, Cr, Ni, Mn, and As) were investigated from agricultural soils in a long-term Zn smelting area in Guizhou, China. Different health risk assessment methods and models were used to access health risks. The results show that the concentrations of all the eight heavy metals were significantly higher than their corresponding background values (p < 0.05). Pb, Cd, and As were the most contaminated elements, with 93.6%, 90.3% and 48.4% of agricultural soil samples higher than the risk screening values, respectively. Statistical analysis indicated that Pb, Cd, Cu, Zn, Mn, and As could be mainly accounted for Zn smelting activities, while Cr and Ni may be generally more controlled by natural sources. The geo-accumulation index (Igeo) suggested that the most seriously contaminating heavy metals were Pb, Cd, and Zn, with 96.8%, 90.3%, and 96.8%, respectively, of the soil samples classified as moderately to extremely contaminated. The non-carcinogenic health risk associated with Pb, Cd and As were observed for children, meanwhile, the carcinogenic risk due to As was found for both adults and children. Regardless of cancer risk or non-cancer risk, local children are at greater risk than adults. Therefore, Pb, Cd and As play the leading role to cause potential health risks in the study area, which need to be paid more attention and also effective control measures should be taken.
Feng Chen; Qian Wang; Fanli Meng; Miao Chen; Bing Wang. Effects of long-term zinc smelting activities on the distribution and health risk of heavy metals in agricultural soils of Guizhou province, China. Environmental Geochemistry and Health 2020, 1 -16.
AMA StyleFeng Chen, Qian Wang, Fanli Meng, Miao Chen, Bing Wang. Effects of long-term zinc smelting activities on the distribution and health risk of heavy metals in agricultural soils of Guizhou province, China. Environmental Geochemistry and Health. 2020; ():1-16.
Chicago/Turabian StyleFeng Chen; Qian Wang; Fanli Meng; Miao Chen; Bing Wang. 2020. "Effects of long-term zinc smelting activities on the distribution and health risk of heavy metals in agricultural soils of Guizhou province, China." Environmental Geochemistry and Health , no. : 1-16.
The pyrolysis treatment can effectively reduce the sewage sludge volume and fix its nutrients for land application. The synergistic effect on the fixation of nutrients can be better exerted by the sewage sludge biochars (SSB) prepared by the co-pyrolysis method. In this study, SSB was prepared by adding stalks and mineral materials in to sewage sludge that was used as the base material. The element composition, nutrient stability, and adsorption effect of SSB, as well as the feasibility of applying modified SSB in reducing soil nutrients leaching, were discussed in this study. The results indicate that the modified SSB reduced the amount of nitrate leaching and has the ability to remove nutrients in the solution, among which the removal effect of nitrate is better. Moreover, the modified SSB is added to the soil by leaching experiments in soil columns, which can reduce the leaching of nutrients.
Xing-Yu Duan; Yang Cao; Tao-Ze Liu; Ling Li; Bing Wang; Xiao-Dan Wang. Nutrient stability and sorption of sewage sludge biochar prepared from co-pyrolysis of sewage sludge and stalks / mineral materials. Environmental Pollutants and Bioavailability 2020, 32, 12 -18.
AMA StyleXing-Yu Duan, Yang Cao, Tao-Ze Liu, Ling Li, Bing Wang, Xiao-Dan Wang. Nutrient stability and sorption of sewage sludge biochar prepared from co-pyrolysis of sewage sludge and stalks / mineral materials. Environmental Pollutants and Bioavailability. 2020; 32 (1):12-18.
Chicago/Turabian StyleXing-Yu Duan; Yang Cao; Tao-Ze Liu; Ling Li; Bing Wang; Xiao-Dan Wang. 2020. "Nutrient stability and sorption of sewage sludge biochar prepared from co-pyrolysis of sewage sludge and stalks / mineral materials." Environmental Pollutants and Bioavailability 32, no. 1: 12-18.
Most of the volatile organic compounds (VOCs) are toxic and harmful to human health and environment. In this study, hydrochars activated with CO2 were applied to remove VOCs. Two typical VOCs, acetone and cyclohexane, were used as the ‘model’ adsorbates to evaluate hydrochars’ performance. Specific surface areas of pristine hydrochars were small ( 0.91) between the VOC removal and hydrochars’ specific surface area. These results suggest that the governing mechanism was mainly physical adsorption. Increasing experimental temperature (80–139 °C) desorbed the VOCs from the hydrochars. Due to its higher boiling point, cyclohexane desorption required a higher temperature than acetone desorption. The reusability of the activated hydrochars to the two VOCs was confirmed by five continuous adsorption-desorption cycles. The overall results indicated that hydrochars, particularly after CO2 activation, are sufficient for VOC abatement.
Xueyang Zhang; Wei Xiang; Bing Wang; June Fang; Weixin Zou; Feng He; Yuncong Li; Daniel C.W. Tsang; Yong Sik Ok; Bin Gao. Adsorption of acetone and cyclohexane onto CO2 activated hydrochars. Chemosphere 2019, 245, 125664 .
AMA StyleXueyang Zhang, Wei Xiang, Bing Wang, June Fang, Weixin Zou, Feng He, Yuncong Li, Daniel C.W. Tsang, Yong Sik Ok, Bin Gao. Adsorption of acetone and cyclohexane onto CO2 activated hydrochars. Chemosphere. 2019; 245 ():125664.
Chicago/Turabian StyleXueyang Zhang; Wei Xiang; Bing Wang; June Fang; Weixin Zou; Feng He; Yuncong Li; Daniel C.W. Tsang; Yong Sik Ok; Bin Gao. 2019. "Adsorption of acetone and cyclohexane onto CO2 activated hydrochars." Chemosphere 245, no. : 125664.
Novel biochar was prepared by ball milling using bamboo as raw material. The aim of this study was to find a good alternative way to improve the potentials of biochar for ammonium adsorption from aqueous solution. The sorption performance of ball-milled bamboo biochar (BMBB) was compared with that of bamboo biochar (BB) using batch adsorption experiments. Different adsorption kinetics models proved that the pseudo-second order was the best kinetic model for explanation of the adsorption kinetics characteristics, indicative of the energetically heterogeneous solid surface of the biochar. The Langmuir model could fit the isothermal adsorption data of BMBB well. The maximum adsorption capacity of BMBB (22.9 mg g−1) was much higher than that of BB (7.0 mg g−1). This study offers a relatively cost-effective and efficient methodology for the improvement in the adsorption capacity of biochar for ammonium nitrogen.
Yongjun Qin; Xiaolong Zhu; Qing Su; Abdulraheem Anumah; Bin Gao; Wenqiang Lyu; Xue Zhou; Ying Xing; Bing Wang. Enhanced removal of ammonium from water by ball-milled biochar. Environmental Geochemistry and Health 2019, 42, 1579 -1587.
AMA StyleYongjun Qin, Xiaolong Zhu, Qing Su, Abdulraheem Anumah, Bin Gao, Wenqiang Lyu, Xue Zhou, Ying Xing, Bing Wang. Enhanced removal of ammonium from water by ball-milled biochar. Environmental Geochemistry and Health. 2019; 42 (6):1579-1587.
Chicago/Turabian StyleYongjun Qin; Xiaolong Zhu; Qing Su; Abdulraheem Anumah; Bin Gao; Wenqiang Lyu; Xue Zhou; Ying Xing; Bing Wang. 2019. "Enhanced removal of ammonium from water by ball-milled biochar." Environmental Geochemistry and Health 42, no. 6: 1579-1587.
Two kinds of industrial wastes (distillers grains and phosphogypsum) were used as raw materials to produce a new biochar composite for Cr(VI) removal in water. The influencing factors including pyrolysis temperature, dosage, initial solution pH as well as contacting time were explored. The adsorption kinetics, isotherms, and thermodynamics of two biochars were conducted. The results show that the adsorption of Cr(VI) by biochar is related to pH. The ideal pH was 3.0 and the adsorbed Cr(VI) decreases as the pH increases. The Cr(VI) adsorption process conformed to the pseudo-second-order equation. Phosphogypsum modified (PM)-biochar is well described by the Freundlich model. The maximum adsorption capacities of distillers grains (DG)-biochar and PM-biochar on Cr(VI) were 63.1 and 157.9 mg g−1, respectively. The thermodynamic analysis indicates that the Cr(VI) adsorption occurs spontaneously which is an endothermic process. This study provided an alternative way for Cr(VI) removal from water.
Guoqi Lian; Bing Wang; Xinqing Lee; Ling Li; Taoze Liu; Wenqiang Lyu. Enhanced removal of hexavalent chromium by engineered biochar composite fabricated from phosphogypsum and distillers grains. Science of The Total Environment 2019, 697, 134119 .
AMA StyleGuoqi Lian, Bing Wang, Xinqing Lee, Ling Li, Taoze Liu, Wenqiang Lyu. Enhanced removal of hexavalent chromium by engineered biochar composite fabricated from phosphogypsum and distillers grains. Science of The Total Environment. 2019; 697 ():134119.
Chicago/Turabian StyleGuoqi Lian; Bing Wang; Xinqing Lee; Ling Li; Taoze Liu; Wenqiang Lyu. 2019. "Enhanced removal of hexavalent chromium by engineered biochar composite fabricated from phosphogypsum and distillers grains." Science of The Total Environment 697, no. : 134119.
A novel biochar composite was fabricated via the pyrolysis of distillers grains treated phosphogypsum for phosphate removal from water. Batch adsorption experiments were performed on the adsorption characteristics of phosphate. Effects of pyrolysis temperature, solution pH, the dosage of adsorbent, ambient temperature on phosphate adsorption were also investigated. The results demonstrated that the optimum initial solution pH for phosphate adsorption was 6.0, and high pyrolysis temperature was favorable for phosphate adsorption. The optimal dosage of biochar was 1.25 g L−1. A pseudo-second-order kinetic model can well explain the adsorption kinetics, indicative of the energetically heterogeneous solid surface of the composite. The maximum phosphate adsorption capacity of the phosphogypsum modified biochar obtained from Langmuir isotherm reached 102.4 mg g−1 which was almost five times that of distillers grains biochar alone (21.5 mg g−1). The mechanism is mainly attributed to electrostatic adsorption, surface precipitation and ligand exchange. The ideal adsorption performance indicated that biochar supported phosphogypsum can be used as high-quality adsorbent for phosphate removal in wastewater treatment.
Bing Wang; Guoqi Lian; Xinqing Lee; Bin Gao; Ling Li; Taoze Liu; Xueyang Zhang; Yulin Zheng. Phosphogypsum as a novel modifier for distillers grains biochar removal of phosphate from water. Chemosphere 2019, 238, 124684 .
AMA StyleBing Wang, Guoqi Lian, Xinqing Lee, Bin Gao, Ling Li, Taoze Liu, Xueyang Zhang, Yulin Zheng. Phosphogypsum as a novel modifier for distillers grains biochar removal of phosphate from water. Chemosphere. 2019; 238 ():124684.
Chicago/Turabian StyleBing Wang; Guoqi Lian; Xinqing Lee; Bin Gao; Ling Li; Taoze Liu; Xueyang Zhang; Yulin Zheng. 2019. "Phosphogypsum as a novel modifier for distillers grains biochar removal of phosphate from water." Chemosphere 238, no. : 124684.
Bing Wang; Xinqing Lee; Benny K. G. Theng; Like Zhang; Hongguang Cheng; Jianzhong Cheng; Wenqiang Lyu. Biochar addition can reduce NOx gas emissions from a calcareous soil. Environmental Pollutants and Bioavailability 2019, 31, 38 -48.
AMA StyleBing Wang, Xinqing Lee, Benny K. G. Theng, Like Zhang, Hongguang Cheng, Jianzhong Cheng, Wenqiang Lyu. Biochar addition can reduce NOx gas emissions from a calcareous soil. Environmental Pollutants and Bioavailability. 2019; 31 (1):38-48.
Chicago/Turabian StyleBing Wang; Xinqing Lee; Benny K. G. Theng; Like Zhang; Hongguang Cheng; Jianzhong Cheng; Wenqiang Lyu. 2019. "Biochar addition can reduce NOx gas emissions from a calcareous soil." Environmental Pollutants and Bioavailability 31, no. 1: 38-48.
Alginate-based composites have been extensively studied for applications in energy and environmental sectors due to their biocompatible, nontoxic, and cost-effective properties. This review is designed to provide an overview of the synthesis and application of alginate-based composites. In addition to an overview of current understanding of alginate biopolymer, gelation process, and cross-linking mechanisms, this work focuses on adsorption mechanisms and performance of different alginate-based composites for the removal of various pollutants including dyes, heavy metals, and antibiotics in water and wastewater. While encapsulation in alginate gel beads confers protective benefits to engineered nanoparticles, carbonaceous materials, cells and microbes, alginate-based composites typically exhibit enhanced adsorption performance. The physical and chemical properties of alginate-based composites determine the effectiveness under different application conditions. A series of alginate-based composites and their physicochemical and sorptive properties have been summarized. This critical review not only summarizes recent advances in alginate-based composites but also presents a perspective of future work for their environmental applications.
Bing Wang; Yongshan Wan; Yuling Zheng; Xinqing Lee; Taoze Liu; Zebin Yu; Jun Huang; Yong Sik Ok; Jianjun Chen; Bin Gao. Alginate-based composites for environmental applications: a critical review. Critical Reviews in Environmental Science and Technology 2018, 49, 318 -356.
AMA StyleBing Wang, Yongshan Wan, Yuling Zheng, Xinqing Lee, Taoze Liu, Zebin Yu, Jun Huang, Yong Sik Ok, Jianjun Chen, Bin Gao. Alginate-based composites for environmental applications: a critical review. Critical Reviews in Environmental Science and Technology. 2018; 49 (4):318-356.
Chicago/Turabian StyleBing Wang; Yongshan Wan; Yuling Zheng; Xinqing Lee; Taoze Liu; Zebin Yu; Jun Huang; Yong Sik Ok; Jianjun Chen; Bin Gao. 2018. "Alginate-based composites for environmental applications: a critical review." Critical Reviews in Environmental Science and Technology 49, no. 4: 318-356.
The use of biochar for the removal of heavy metals from water has environmental benefits. In order to elucidate the potential application of highly functionalized biochar for the removal of Pb(II) in aqueous solution, maple wood biochar was oxidized using hydrogen peroxide. The pH values of oxidized biochar ranged from 8.1 to 3.7, with one set being adjusted to a pH of 7 as a comparison. It was found that oxidizing the biochars increased their Pb(II) adsorption capacity if the pH remained below 6 (strong oxidation), but decreased their Pb(II) adsorption ability above pH 6 (weak oxidation). After adjusting the pH of oxidized biochar to pH 7, the Pb(II) adsorption capacity further increased two to sixfold for oxidized biochars originally at pH 3.7–6. The adsorption characteristics of Pb(II) were well described by the Langmuir equation. Adsorption of Pb(II) was not fully reversible in water. Less than 6% of Pb(II) desorbed in water in two consecutive steps than was previously adsorbed, for biochars with a pH below 7, irrespective of oxidation. Recovery using an extraction with 0.1 M NaNO3 increased from 0.7% to 32.7% of Pb(II) undesorbed by both preceding water extractions with increasing oxidation, for biochars with a pH below 7. Unextractable Pb(II) was lower at low oxidation but increased to 99.0% of initially adsorbed amounts at low pH, which indicated that the adsorption of Pb(II) on oxidized biochar is pH independent.
Qian Wang; Bing Wang; Xinqing Lee; Johannes Lehmann; Bin Gao. Sorption and desorption of Pb(II) to biochar as affected by oxidation and pH. Science of The Total Environment 2018, 634, 188 -194.
AMA StyleQian Wang, Bing Wang, Xinqing Lee, Johannes Lehmann, Bin Gao. Sorption and desorption of Pb(II) to biochar as affected by oxidation and pH. Science of The Total Environment. 2018; 634 ():188-194.
Chicago/Turabian StyleQian Wang; Bing Wang; Xinqing Lee; Johannes Lehmann; Bin Gao. 2018. "Sorption and desorption of Pb(II) to biochar as affected by oxidation and pH." Science of The Total Environment 634, no. : 188-194.
Agricultural soils are an important source of greenhouse gases (GHG). Biochar application to such soils has the potential of mitigating global anthropogenic GHG emissions. Under irrigation, the topsoils in arid regions experience repeated drying and wetting during the crop growing season. Biochar incorporation into these soils would change the soil microbial environment and hence affect GHG emissions. Little information, however, is available regarding the effect of biochar addition on carbon dioxide (CO2) and nitrous oxide (N2O) emissions from agricultural soils undergoing repeated drying and wetting. Here, we report the results of a 49-day aerobic incubation experiment, incorporating biochar into an anthropogenic alluvial soil in an arid region of Xinjiang Province, China, and measuring CO2 and N2O emissions. Under both drying–wetting and constantly moist conditions, biochar amendment significantly increased cumulative CO2 emission. At the same time, there was a significant reduction (up to ~20 %) in cumulative N2O emission, indicating that the addition of biochar to irrigated agricultural soils may effectively slow down global warming in arid regions of China.
Fang Yang; Xinqing Lee; Benny K. G. Theng; Bing Wang; Jianzhong Cheng; Qian Wang. Effect of biochar addition on short-term N2O and CO2 emissions during repeated drying and wetting of an anthropogenic alluvial soil. Environmental Geochemistry and Health 2016, 39, 635 -647.
AMA StyleFang Yang, Xinqing Lee, Benny K. G. Theng, Bing Wang, Jianzhong Cheng, Qian Wang. Effect of biochar addition on short-term N2O and CO2 emissions during repeated drying and wetting of an anthropogenic alluvial soil. Environmental Geochemistry and Health. 2016; 39 (3):635-647.
Chicago/Turabian StyleFang Yang; Xinqing Lee; Benny K. G. Theng; Bing Wang; Jianzhong Cheng; Qian Wang. 2016. "Effect of biochar addition on short-term N2O and CO2 emissions during repeated drying and wetting of an anthropogenic alluvial soil." Environmental Geochemistry and Health 39, no. 3: 635-647.
Maple wood biochars were produced at different pyrolysis temperatures and residence times to investigate the effects of pyrolysis conditions and oxidation on the retention of ammonium in aqueous solution and adsorption and desorption was determined.
Bing Wang; Johannes Lehmann; Kelly Hanley; Rachel Hestrin; Akio Enders. Ammonium retention by oxidized biochars produced at different pyrolysis temperatures and residence times. RSC Advances 2016, 6, 41907 -41913.
AMA StyleBing Wang, Johannes Lehmann, Kelly Hanley, Rachel Hestrin, Akio Enders. Ammonium retention by oxidized biochars produced at different pyrolysis temperatures and residence times. RSC Advances. 2016; 6 (48):41907-41913.
Chicago/Turabian StyleBing Wang; Johannes Lehmann; Kelly Hanley; Rachel Hestrin; Akio Enders. 2016. "Ammonium retention by oxidized biochars produced at different pyrolysis temperatures and residence times." RSC Advances 6, no. 48: 41907-41913.
The objective of this work was to investigate the retention mechanisms of ammonium in aqueous solution by using progressively oxidized maple wood biochar at different pH values. Hydrogen peroxide was used to oxidize the biochar to pH values ranging from 8.1 to 3.7, with one set being adjusted to a pH of 7 afterwards. Oxidizing the biochars at their lowered pH did not increase their ability to adsorb ammonium. However, neutralizing the oxygen-containing surface functional groups on oxidized biochar to pH 7 increased ammonia adsorption two to three-fold for biochars originally at pH 3.7-6, but did not change adsorption of biochars oxidized to pH 7 and above. The adsorption characteristics of ammonium are well described by the Freundlich equation. Adsorption was not fully reversible in water, and less than 27% ammonium was desorbed in water in two consecutive steps than previously adsorbed, for biochars with a pH below 7, irrespective of oxidation. Recovery using an extraction with 2M KCl increased from 34% to 99% of ammonium undesorbed by both preceding water extractions with increasing oxidation, largely irrespective of pH adjustment. Unrecovered ammonium in all extractions and residual biochar was negligible at high oxidation, but increased to 39% of initially adsorbed amounts at high pH, likely due to low amounts adsorbed and possible ammonia volatilization losses.
Bing Wang; Johannes Lehmann; Kelly Hanley; Rachel Hestrin; Akio Enders. Adsorption and desorption of ammonium by maple wood biochar as a function of oxidation and pH. Chemosphere 2015, 138, 120 -126.
AMA StyleBing Wang, Johannes Lehmann, Kelly Hanley, Rachel Hestrin, Akio Enders. Adsorption and desorption of ammonium by maple wood biochar as a function of oxidation and pH. Chemosphere. 2015; 138 ():120-126.
Chicago/Turabian StyleBing Wang; Johannes Lehmann; Kelly Hanley; Rachel Hestrin; Akio Enders. 2015. "Adsorption and desorption of ammonium by maple wood biochar as a function of oxidation and pH." Chemosphere 138, no. : 120-126.