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Xie L, Ma Q, Chen Q, Liu Y, Guo P, Zhang J, Duan G, Lin A, Zhang T, Li S. Efficient remediation of different concentrations of Cr-contaminated soils by nano zero-valent iron modified with carboxymethyl cellulose and biochar. J Environ Sci (China) 2025; 147:474-486. [PMID: 39003063 DOI: 10.1016/j.jes.2023.12.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/05/2023] [Accepted: 12/05/2023] [Indexed: 07/15/2024]
Abstract
Nano zero-valent iron (nZVI) is widely used in soil remediation due to its high reactivity. However, the easy agglomeration, poor antioxidant ability and passivation layer of Fe-Cr coprecipitates of nZVI have limited its application scale in Cr-contaminated soil remediation, especially in high concentration of Cr-contaminated soil. Herein, we found that the carboxymethyl cellulose on nZVI particles could increase the zeta potential value of soil and change the phase of nZVI. Along with the presence of biochar, 97.0% and 96.6% Cr immobilization efficiency through CMC-nZVI/BC were respectively achieved in high and low concentrations of Cr-contaminated soils after 90-days remediation. In addition, the immobilization efficiency of Cr(VI) only decreased by 5.1% through CMC-nZVI/BC treatment after 10 weeks aging in air, attributing to the strong antioxidation ability. As for the surrounding Cr-contaminated groundwater, the Cr(VI) removal capacity of CMC-nZVI/BC was evaluated under different reaction conditions through column experiments and COMSOL Multiphysics. CMC-nZVI/BC could efficiently remove 85% of Cr(VI) in about 400 hr when the initial Cr(VI) concentration was 40 mg/L and the flow rate was 0.5 mL/min. This study demonstrates that uniformly dispersed CMC-nZVI/BC has an excellent remediation effect on different concentrations of Cr-contaminated soils.
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Affiliation(s)
- Lihong Xie
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Qiyan Ma
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Qingjun Chen
- China National Petroleum and Chemical Planning Institute, Beijing 100013, China
| | - Yiyang Liu
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Pengfei Guo
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jinlan Zhang
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Guilan Duan
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Aijun Lin
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Tingting Zhang
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Shangyi Li
- Department of Environmental Science and Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
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2
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Liang J, Zhen P, Liu L, Zhou W, Li Y, Liu Y, Shen Y, Tong M. Functional group-specific reduction of Cr(VI) by low molecular weight organic acids in frozen solution: Kinetics, mechanism and DFT calculation. WATER RESEARCH 2024; 265:122221. [PMID: 39128334 DOI: 10.1016/j.watres.2024.122221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 08/01/2024] [Accepted: 08/03/2024] [Indexed: 08/13/2024]
Abstract
Low molecular weight organic acids (LMWOA) are commonly present in natural water and play a pivotal role in the reduction of Cr(VI). In frozen solutions, the efficiency of Cr(VI) reduction is significantly enhanced due to the freezing concentration effect. However, this facilitation is found to be contingent upon the functional groups of LMWOA in this study. To be specific, LMWOA and Cr(VI) can form five-membered ring complexes, which greatly enhance electron transfer efficiency through Ligand-to-Metal Charge Transfer (LMCT). DFT calculations indicate that oxygen-containing groups located on carbon atoms at α positions play a crucial role in forming these complexes, ultimately determining the kinetics of Cr(VI) reduction. Moreover, freezing not only increases proton concentrations but also reduces free water molecule content in the liquid-like layer (LLL), thereby affecting LMWOA species through regulation of protonation and hydrolysis, and subsequently impacting reaction mechanisms. The stoichiometric ratios between LMWOA and Cr(VI) exceed theoretical values due to complexation with Cr(III). The reduction of Cr(VI) by LMWOA in frozen solutions is inhibited by soil solution, while the degree of inhibition varies among different types of LMWOA.
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Affiliation(s)
- Jialiang Liang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China
| | - Peng Zhen
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China
| | - Liping Liu
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China
| | - Wenshuai Zhou
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China
| | - Yunyi Li
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China.
| | - Yangsheng Liu
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China
| | - Yun Shen
- Department of Civil and Environmental Engineering, George Washington University. 800 22nd St NW, Washington, DC 20052
| | - Meiping Tong
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China
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Zhao X, Liu X, Zhang Z, Ren W, Lin C, He M, Ouyang W. Mechanochemical remediation of contaminated soil: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 946:174117. [PMID: 38908592 DOI: 10.1016/j.scitotenv.2024.174117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/20/2024] [Accepted: 06/16/2024] [Indexed: 06/24/2024]
Abstract
Mechanochemical techniques have been garnering growing attention in remediation of contaminated soil. This paper summarizes the performance, mechanism, influential factors, and environmental impacts of mechanochemical remediation (MCR) for persistent organic pollutants (POPs) contaminated soil and heavy metal(loid) s (HMs) contaminated soil. Firstly, in contrast to other technologies, MCR can achieve desirable treatment of POPs, HMs, and co-contaminated soil, especially with high-concentration pollutants. Secondly, POPs undergo mineralization via interaction with mechanically activated substances, where aromatic and aliphatic pollutants in soil may go through varied degradation routes; inorganic pollutants can be firmly combined with soil particles by fragmentation and agglomeration induced by mechanical power, during which additives may enhance the combination but their contact with anionic metal(loid)s may be partially suppressed. Thirdly, the effect of MCR primarily hinges on types of milling systems, the accumulation of mechanical energy, and the use of reagents, which is basically regulated through operating parameters: rotation speed, ball-to-powder ratio, reagent-to-soil ratio, milling time, and soil treatment capacity; minerals like clay, metal oxides, and sand in soil itself are feasible reagents for remediation, and alien additives play a crucial role in synergist and detoxification; additionally, various physicochemical properties of soil might influence the mechanochemical effect to varying degrees, yet the key influential performance and mechanism remain unclear and require further investigation. Concerning the assessment of soil after treatment, attention needs to be paid to soil properties, toxicity of POPs' intermediates and leaching HMs, and long-term appraisement, particularly with the introduction of aggressive additives into the system. Finally, proposals for current issues and forthcoming advancements in this domain are enumerated in items. This review provides valuable insight into mechanochemical approaches for performing more effective and eco-friendly remediation on contaminated soil.
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Affiliation(s)
- Xiwang Zhao
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Xitao Liu
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
| | - Zhenguo Zhang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Wenbo Ren
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Chunye Lin
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Mengchang He
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Wei Ouyang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; Advanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai 519087, China
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Xia X, Zhang X, Liu P, Zhang Y, Hou T, Zhang R, He J, Fang G, Yang J, Wu X. Effect of straw decomposition on hexavalent chromium removal by straw: Significant roles of surface potential and dissolved organic matter. J Colloid Interface Sci 2024; 678:946-954. [PMID: 39270394 DOI: 10.1016/j.jcis.2024.09.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2024] [Revised: 08/28/2024] [Accepted: 09/05/2024] [Indexed: 09/15/2024]
Abstract
Mobility and bioavailability of hexavalent chromium (Cr(VI)) in agricultural soils are affected by interactions between Cr(VI) and returned crop straws. However, the effect of straw decomposition on Cr(VI) removal and underlying mechanisms remain unclear. In this study, Cr(VI) removal by pristine and decomposed rice/rape straws was investigated by batch experiments and a series of spectroscopies. The results showed that straw decomposition inhibited Cr(VI) removal, regardless of straw types. However, the potential mechanisms of the inhibition were distinct for the two straws. For the rice straw, a lower zeta potential after decomposition suppressed Cr(VI) sorption and subsequent reduction. In addition, less Cr(VI) was reduced by the decomposed rice straw-derived dissolved organic matter (DOM) than the pristine one. In contrast, for the rape straw, due to the increased zeta potential after decomposition, the decreased Cr(VI) removal was mainly ascribed to less Cr(VI) reduction by the rape straw-derived DOM. These results emphasized the significant roles of straw surface potential and DOM in Cr(VI) removal, depending on straw types and decomposition, which facilitate the fundamental understanding of Cr(VI) removal by straws and are helpful for predicting the environmental risk of Cr and rational straw return in Cr(VI)-contaminated fields.
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Affiliation(s)
- Xing Xia
- Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China; Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Xingbin Zhang
- Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Peng Liu
- Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Yongyi Zhang
- Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Tingting Hou
- Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Ranran Zhang
- Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Jiehong He
- Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Guodong Fang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Jianjun Yang
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China (Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences), Beijing, 100081, China.
| | - Xiangwei Wu
- Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
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Yang D, Fang W, Zhang H, Sun H, Gu X, Chen H, Luo J. Effects of nZVI on the migration and availability of Cr(VI) in soils under simulated acid rain leaching conditions. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:134985. [PMID: 38908184 DOI: 10.1016/j.jhazmat.2024.134985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 06/08/2024] [Accepted: 06/19/2024] [Indexed: 06/24/2024]
Abstract
Hexavalent chromium, Cr(VI), is a ubiquitous toxic metal that can be reduced to Cr(III) by nano-zero-valent iron (nZVI). Finding out effects of continuous rainfall leaching on the Cr(VI) release and availability remains a problem, needing to be addressed. Whether the Cr(VI) reduction by nZVI and continuous rainfall leaching lead to localized heterogeneity in soil is unclear. Therefore, two in situ high-resolution (HR) techniques of the diffusive gradients in thin-films (DGT) and planar optode were combined with ex situ sampling experiments here. Results demonstrate that nZVI decreased Cr(VI) leaching by 5.60-8.50 % compared to control soils. DGT-measured concentrations of Cr(VI), CDGT-Cr(VI), ranged from 7.31 to 19.4 μg L-1 in the control soils, increasing with depth while CDGT-Cr(VI) in nZVI-treated soils (2.41-6.18 μg L-1) decreased or remained stable with depth. However, simulated acid-rain leaching increases CDGT-Cr(VI) by 1.61-fold in nZVI-treated soils, negatively affecting the remediation. DGT measurements in bulk soils using disc devices are better at capturing the change of Cr(VI) availability at different conditions, whereas 2D-HR DGT mappings did not characterize significant mobilization of Cr(VI) at the micro-scale. These findings emphasize the importance of monitoring Cr(VI) release and availability in remediated soil under acid-rain leaching conditions for effective environment management.
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Affiliation(s)
- Danxing Yang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210023, China
| | - Wen Fang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210023, China
| | - Hao Zhang
- Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom
| | - Haitao Sun
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210023, China
| | - Xueyuan Gu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210023, China
| | - Haiyi Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210023, China
| | - Jun Luo
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210023, China.
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6
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Xu H, Zhang H, Qin C, Li X, Xu D, Zhao Y. Groundwater Cr(VI) contamination and remediation: A review from 1999 to 2022. CHEMOSPHERE 2024; 360:142395. [PMID: 38797207 DOI: 10.1016/j.chemosphere.2024.142395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 05/13/2024] [Accepted: 05/20/2024] [Indexed: 05/29/2024]
Abstract
Hexavalent chromium (Cr(VI)) contamination of groundwater has traditionally been an environmental issue of great concern due to its bioaccumulative and highly toxic nature. This paper presents a review and bibliometric analysis of the literature on the interest area "Cr(VI) in groundwater" published in the Web of Science Core Collection from 1999 to 2022. First, information on 203 actual Cr(VI)-contaminated groundwater sites around the world was summarized, and the basic characteristics of the sources and concentrations of contamination were derived. 68.95% of the sites were due to human causes and 56.43% of these sites had Cr(VI) concentrations in the range of 0-10 mg/L. At groundwater sites with high Cr(VI) contamination due to natural causes, 75.00% of the sites had Cr(VI) concentrations less than 0.2 mg/L. A total of 936 papers on "Cr(VI) in groundwater" were retrieved for bibliometric analysis: interest in research on Cr(VI) in groundwater has grown rapidly in recent years; 59.4% of the papers were published in the field of environmental sciences. A systematic review of the progress of studies on the Cr(VI) removal/remediation based on reduction, adsorption and biological processes is presented. Out of 666 papers on Cr(VI) removal/remediation, 512, 274, and 75 papers dealt with the topics of reduction, adsorption, and bioremediation, respectively. In addition, several studies have demonstrated the potential applicability of natural attenuation in the remediation of Cr(VI)-contaminated groundwater. This paper will help researchers to understand and investigate methodological strategies to remove Cr(VI) from groundwater in a more targeted and effective manner.
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Affiliation(s)
- Huichao Xu
- Key Laboratory of Groundwater Resources and Environment of Ministry of Education, College of New Energy and Environment, Jilin University, Changchun, 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, Changchun, 130021, China; Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, China
| | - Hui Zhang
- Key Laboratory of Groundwater Resources and Environment of Ministry of Education, College of New Energy and Environment, Jilin University, Changchun, 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, Changchun, 130021, China; Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, China
| | - Chuanyu Qin
- Key Laboratory of Groundwater Resources and Environment of Ministry of Education, College of New Energy and Environment, Jilin University, Changchun, 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, Changchun, 130021, China; Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, China
| | - Xiaoyu Li
- Key Laboratory of Groundwater Resources and Environment of Ministry of Education, College of New Energy and Environment, Jilin University, Changchun, 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, Changchun, 130021, China; Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, China
| | - Dan Xu
- Key Laboratory of Groundwater Resources and Environment of Ministry of Education, College of New Energy and Environment, Jilin University, Changchun, 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, Changchun, 130021, China; Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, China
| | - Yongsheng Zhao
- Key Laboratory of Groundwater Resources and Environment of Ministry of Education, College of New Energy and Environment, Jilin University, Changchun, 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, Changchun, 130021, China; Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, China.
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7
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Yang X, Shi Q, Wang X, Zhang T, Feng K, Wang G, Zhao J, Yuan X, Ren J. Melatonin-Induced Chromium Tolerance Requires Hydrogen Sulfide Signaling in Maize. PLANTS (BASEL, SWITZERLAND) 2024; 13:1763. [PMID: 38999603 PMCID: PMC11244195 DOI: 10.3390/plants13131763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2024] [Revised: 06/22/2024] [Accepted: 06/25/2024] [Indexed: 07/14/2024]
Abstract
Both melatonin and hydrogen sulfide (H2S) mitigate chromium (Cr) toxicity in plants, but the specific interaction between melatonin and H2S in Cr detoxification remains unclear. In this study, the interaction between melatonin and H2S in Cr detoxification was elucidated by measuring cell wall polysaccharide metabolism and antioxidant enzyme activity in maize. The findings revealed that exposure to Cr stress (100 μM K2Cr2O7) resulted in the upregulation of L-/D-cysteine desulfhydrase (LCD/DCD) gene expression, leading to a 77.8% and 27.3% increase in endogenous H2S levels in maize leaves and roots, respectively. Similarly, the endogenous melatonin system is activated in response to Cr stress. We found that melatonin had a significant impact on the relative expression of LCD/DCD, leading to a 103.3% and 116.7% increase in endogenous H2S levels in maize leaves and roots, respectively. In contrast, NaHS had minimal effects on the relative mRNA expression of serotonin-Nacetyltransferase (SNAT) and endogenous melatonin levels. The production of H2S induced by melatonin is accompanied by an increase in Cr tolerance, as evidenced by elevated gene expression, elevated cell wall polysaccharide content, increased pectin methylesterase activity, and improved antioxidant enzyme activity. The scavenging of H2S decreases the melatonin-induced Cr tolerance, while the inhibitor of melatonin synthesis, p-chlorophenylalanine (p-CPA), has minimal impact on H2S-induced Cr tolerance. In conclusion, our findings suggest that H2S serves as a downstream signaling molecule involved in melatonin-induced Cr tolerance in maize.
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Affiliation(s)
- Xiaoxiao Yang
- College of Life Sciences, Shanxi Agricultural University, Jinzhong 030800, China
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Life Sciences, Northwest A&F University, Xianyang 712100, China
| | - Qifeng Shi
- College of Agriculture, Shanxi Agricultural University, Jinzhong 030800, China
| | - Xinru Wang
- College of Agriculture, Shanxi Agricultural University, Jinzhong 030800, China
| | - Tao Zhang
- College of Life Sciences, Shanxi Agricultural University, Jinzhong 030800, China
| | - Ke Feng
- College of Agriculture, Shanxi Agricultural University, Jinzhong 030800, China
| | - Guo Wang
- College of Agriculture, Shanxi Agricultural University, Jinzhong 030800, China
| | - Juan Zhao
- College of Agriculture, Shanxi Agricultural University, Jinzhong 030800, China
| | - Xiangyang Yuan
- College of Agriculture, Shanxi Agricultural University, Jinzhong 030800, China
| | - Jianhong Ren
- College of Life Sciences, Shanxi Agricultural University, Jinzhong 030800, China
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Wang Y, Zhang Z, Li Y, Liang C, Huang H, Wang S. Available heavy metals concentrations in agricultural soils: Relationship with soil properties and total heavy metals concentrations in different industries. JOURNAL OF HAZARDOUS MATERIALS 2024; 471:134410. [PMID: 38677121 DOI: 10.1016/j.jhazmat.2024.134410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 03/20/2024] [Accepted: 04/23/2024] [Indexed: 04/29/2024]
Abstract
Heavy metal (HM) pollution in agricultural soils has arisen sharply in recent years. However, the impact of main factors on available HMs concentrations in agricultural soils of the three main industries (smelting, chemical and mining industry) is unclear. Herein, soil properties (pH, cation exchange capacity (CEC) and texture (sand, slit, clay)), total and available concentrations were concluded based on the results of 165 research papers from 2000 to 2023 in Web of Science database. In the three industries, the correlation and redundancy analysis were used to study the correlation between main factors and available concentrations, and quantitatively analyzed the contribution of each factor to available concentrations with gradient boosting decision tree model. The results showed that different factors had varying degrees of impact on available metals in the three main industries, and the importance of same factors varied in each industry, as for soil pH, it was most important for available Pb and Zn in the chemical industry, but the total concentrations were most important in the smelting and mining industry. There was no significant correlation between total and available concentrations. Soil properties involved in this paper (especially soil pH) were negatively correlated with available concentrations. This study provides effective guidance for the formulation of soil pollution control and risk assessment standards based on industry classification in the three major industrial impact areas.
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Affiliation(s)
- Yakun Wang
- School of Land Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China
| | - Zhuo Zhang
- School of Land Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China; Key Laboratory of Land Consolidation and Rehabilitation, Ministry of Natural Resources, Beijing 100035, China.
| | - Yuanyuan Li
- School of Land Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China
| | - Chouyuan Liang
- School of Land Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China
| | - Haochong Huang
- School of Science, China University of Geosciences (Beijing), Beijing 100083, China
| | - Sen Wang
- Hebei Key Laboratory of Geological Resources and Environment Monitoring and Protection, Hebei Geological Environmental Monitoring Institute, Shijiazhuang 050021, China
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Luo Y, Pang J, Pan S, Wang J, Jiang X, Xu Q, Zhang H, Ruan C, Ren J, Zhang C, Shi J. Penicillium oxalicum SL2-enhanced nanoscale zero-valent iron effectively reduces Cr(VI) and shifts soil microbiota. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:134058. [PMID: 38508106 DOI: 10.1016/j.jhazmat.2024.134058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2023] [Revised: 02/27/2024] [Accepted: 03/15/2024] [Indexed: 03/22/2024]
Abstract
Most current researches focus solely on reducing soil chromium availability. It is difficult to reduce soil Cr(VI) concentration below 5.0 mg kg-1 using single remediation technology. This study introduced a sustainable soil Cr(VI) reduction and stabilization system, Penicillium oxalicum SL2-nanoscale zero-valent iron (nZVI), and investigated its effect on Cr(VI) reduction efficiency and microbial ecology. Results showed that P. oxalicum SL2-nZVI effectively reduced soil total Cr(VI) concentration from 187.1 to 3.4 mg kg-1 within 180 d, and remained relatively stable at 360 d. The growth curve of P. oxalicum SL2 and microbial community results indicated that γ-ray irradiation shortened the adaptation time of P. oxalicum SL2 and facilitated its colonization in soil. P. oxalicum SL2 colonization activated nZVI and its derivatives, and increased soil iron bioavailability. After restoration, the negative effect of Cr(VI) on soil microorganisms was markedly alleviated. Cr(VI), Fe(II), bioavailable Cr/Fe, Eh, EC and urease (SUE) were the key environmental factors of soil microbiota. Notably, Penicillium significantly stimulated the growth of urease-positive bacteria, Arthrobacter, Pseudarthrobacter, and Microvirga, synergistically reducing soil chromium availability. The combination of P. oxalicum SL2 and nZVI is expected to form a green, economical and long-lasting Cr(VI) reduction stabilization strategy.
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Affiliation(s)
- Yating Luo
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Soil Contamination Bioremediation, College of Environment and Resource Sciences, Zhejiang Agriculture and Forestry University, Hangzhou 311300, China
| | - Jingli Pang
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Siyi Pan
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jing Wang
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xiaohan Jiang
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Qiao Xu
- Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021 China
| | - Haonan Zhang
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Chendao Ruan
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jiayu Ren
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Chun Zhang
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jiyan Shi
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
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10
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Gong K, Zhang Q, Shao X, Wu Y, Qiao Z, Qiu L, Zhang W, Peng C. Microplastics alter Cr accumulation and fruit quality in Cr(VI) contaminated soil-cucumber system during the lifecycle: Insight from rhizosphere bacteria and root metabolism. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168792. [PMID: 38000747 DOI: 10.1016/j.scitotenv.2023.168792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 11/20/2023] [Accepted: 11/20/2023] [Indexed: 11/26/2023]
Abstract
Both microplastics and Cr(VI) potentially threaten soil and crops, but little is known about their interaction in the soil-plant system. This study investigated the effect and mechanism of polyethylene (PE), polyamide (PA), and polylactic acid (PLA) microplastics on Cr bioaccumulation and toxicity in a Cr(VI) contaminated soil-cucumber system during the lifecycle. The results show that microplastics had a greater effect on Cr accumulation in cucumber roots, stems, and leaves than in fruits. PE microplastics increased, but PA and PLA microplastics decreased the Cr accumulation in cucumber. Microplastics, especially high-dose, small, and aged microplastics, exacerbated the effects of accumulated Cr in cucumber on fresh weight and fruit yield. The nutrient contents in fruits except soluble sugars were reduced by microplastics. The random forest regression model shows that the microplastic type was the most important factor causing changes in the soil-cucumber system except for Cr(VI) addition. Under Cr(VI) and microplastic co-exposure, bacteria that could simultaneously tolerate Cr(VI) stress and degrade microplastics were enriched in the rhizosphere soil. The partial least squares path model shows that microplastics reduced the beneficial effect of the bacterial community on cucumber growth. Microplastics, especially PLA microplastics, alleviated the adverse effects of Cr(VI) stress on root metabolism.
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Affiliation(s)
- Kailin Gong
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Qi Zhang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xuechun Shao
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yonghong Wu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, East Beijing Road, Nanjing 210008, China
| | - Zhihua Qiao
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Linlin Qiu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Wei Zhang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Cheng Peng
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
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11
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Wang Z, He X, Li X, Chen L, Tang T, Cui G, Zhang Q, Liu Y. Long-term stability and toxicity effects of three-dimensional electrokinetic remediation on chromium-contaminated soils. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 337:122461. [PMID: 37689131 DOI: 10.1016/j.envpol.2023.122461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 08/22/2023] [Accepted: 08/24/2023] [Indexed: 09/11/2023]
Abstract
The three-dimensional electrokinetic remediation (3D EKR) achieved efficient removal of chromium (Cr) from the soil through mechanisms including electromigration, electroosmosis, and redox reactions. In this study, the long-term stability, leaching toxicity, bioavailability, and phytotoxicity of Cr in remediated soils were systematically analyzed to comprehensively evaluate the effectiveness of the 3D EKR method. The results showed that the concentration of hexavalent chromium (Cr (VI)) in the leachate of the 3D EKR system with sulfidated nano-scale zerovalent iron (S-nZVI) was more than 40% lower than those of the other 3D electrode groups, and the time required to reach the level III standard of groundwater quality criterion in China (0.05 mg/L, GB/T 14848-2017) was significantly shortened. The stabilization of Cr(VI) in contaminated soil after 3D EKR was maintained for 300 pore volumes (PVs), indicating that the treated Cr(VI) had good long-term stability. The leaching toxicity and bioaccessibility of Cr were assessed by the synthetic precipitation leaching procedure (SPLP), the toxicity characteristic leaching procedure (TCLP), and the physiologically based extraction test (PBET). The concentration of Cr(VI) in the SPLP, TCLP, and PBET leachates of the S-nZVI group decreased by more than 25% compared to the other 3D electrode groups, corresponding to the decrease in leaching toxicity and bioavailability of the treated Cr during the 15-day remediation period. In addition, the germination rate of wheat seeds and the average biomass of wheat seedlings in the S-nZVI group under alkaline conditions (EE) were higher than those in the non-polluting group (Blank-OH), indicating that the remediated soil had no obvious toxicity to wheat. In summary, 3D EKR achieved a satisfactory and stable remediation effect on Cr-contaminated soil, especially when using S-nZVI as the 3D electrode.
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Affiliation(s)
- Zheng Wang
- College of Environmental Sciences and Engineering, Peking University; Beijing Key Laboratory for Solid Waste Utilization and Management, Beijing 100871, China.
| | - Xiao He
- China MCC5 Group Corp. Ltd., Chengdu, 610063, China
| | - Xin Li
- Ecological Environment Consulting Department, Beijing Construction Engineering Environmental Remediation Co., Ltd., Beijing 100015, China
| | - Liuzhou Chen
- College of Environmental Sciences and Engineering, Peking University; Beijing Key Laboratory for Solid Waste Utilization and Management, Beijing 100871, China
| | - Tian Tang
- College of Environmental Sciences and Engineering, Peking University; Beijing Key Laboratory for Solid Waste Utilization and Management, Beijing 100871, China
| | - Guodong Cui
- College of Environmental Sciences and Engineering, Peking University; Beijing Key Laboratory for Solid Waste Utilization and Management, Beijing 100871, China
| | - Qiming Zhang
- College of Environmental Sciences and Engineering, Peking University; Beijing Key Laboratory for Solid Waste Utilization and Management, Beijing 100871, China
| | - Yangsheng Liu
- College of Environmental Sciences and Engineering, Peking University; Beijing Key Laboratory for Solid Waste Utilization and Management, Beijing 100871, China.
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12
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Liu J, Sun S, Zhang H, Kong Q, Li Q, Yao X. Remediation materials for the immobilization of hexavalent chromium in contaminated soil: Preparation, applications, and mechanisms. ENVIRONMENTAL RESEARCH 2023; 237:116918. [PMID: 37611786 DOI: 10.1016/j.envres.2023.116918] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 07/01/2023] [Accepted: 08/16/2023] [Indexed: 08/25/2023]
Abstract
Hexavalent chromium is a toxic metal that can induce severe chromium contamination of soil, posing a potential risk to human health and ecosystems. In recent years, the immobilization of Cr(VI) using remediation materials including inorganic materials, organic materials, microbial agents, and composites has exhibited great potential in remediating Cr(VI)-contaminated soil owing to the environmental-friendliness, short period, simple operation, low cost, applicability on an industrial scale, and high efficiency of these materials. Therefore, a systematical summary of the current progress on various remediation materials is essential. This work introduces the production (sources) of remediation materials and examines their characteristics in detail. Additionally, a critical summary of recent research on the utilization of remediation materials for the stabilization of Cr(VI) in the soil is provided, together with an evaluation of their remediation efficiencies toward Cr(VI). The influences of remediation material applications on soil physicochemical properties, microbial community structure, and plant growth are summarized. The immobilization mechanisms of remediation materials toward Cr(VI) in the soil are illuminated. Importantly, this study evaluates the feasibility of each remediation material application for Cr(VI) remediation. The latest knowledge on the development of remediation materials for the immobilization of Cr(VI) in the soil is also presented. Overall, this review will provide a reference for the development of remediation materials and their application in remediating Cr(VI)-contaminated soil.
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Affiliation(s)
- Jiwei Liu
- College of Geography and Environment, Shandong Normal University, Jinan, Shandong, 250014, China.
| | - Shuyu Sun
- College of Geography and Environment, Shandong Normal University, Jinan, Shandong, 250014, China
| | - Huanxin Zhang
- College of Geography and Environment, Shandong Normal University, Jinan, Shandong, 250014, China
| | - Qiang Kong
- College of Geography and Environment, Shandong Normal University, Jinan, Shandong, 250014, China; Dongying Institute, Shandong Normal University, Dongying, Shandong, 257092, China
| | - Qian Li
- School of Modern Agriculture and Environment, Weifang Institute of Technology, Weifang, Shandong, 261000, China
| | - Xudong Yao
- Project Department, Shandong Luqiao Detection Technology Co., Ltd., Rizhao, Shandong, 276800, China
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13
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Liu T, Guan Z, Li J, Ao M, Sun S, Deng T, Wang S, Tang Y, Lin Q, Ni Z, Qiu R. Nano zero-valent iron enhances the absorption and transport of chromium in rice (Oryza sativa L.): Implication for Cr risks management in paddy fields. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 891:164232. [PMID: 37225094 DOI: 10.1016/j.scitotenv.2023.164232] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 04/26/2023] [Accepted: 05/13/2023] [Indexed: 05/26/2023]
Abstract
Chromium (Cr) accumulating in soil caused serious pollution to cultivated land. At present, nano zero-valent iron (nZVI) is considered to be a promising remediation material for Cr-contaminated soil. However, the nZVI impact on the behavior of Cr in the soil-rice system under high natural geological background value remains unknown. We studied the effects of nZVI on the migration and transformation of Cr in paddy soil-rice by pot experiment. Three different doses of nZVI (0, 0.001 % and 0.1 % (w/w)) treatments and one dose of 0.1 % (w/w) nZVI treatment without plant rice were set up. Under continuous flooding conditions, nZVI significantly increased rice biomass compared with the control. At the same time, nZVI significantly promoted the reduction of Fe in the soil, increased the concentration of oxalate Fe and bioavailable Cr, then facilitated the absorption of Cr in rice roots and the transportation to the aboveground part. In addition, the enrichment of Fe(III)-reducing bacteria and sulfate-reducing bacteria in soil provided electron donors for Cr oxidation, which helps to form bioavailable Cr that is easily absorbed by plants. The results of this study can provide scientific basis and technical support for the remediation of Cr -polluted paddy soil with high geological background.
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Affiliation(s)
- Ting Liu
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
| | - Zeting Guan
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
| | - Jingjing Li
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
| | - Ming Ao
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Shengsheng Sun
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Tenghaobo Deng
- Institute of Quality Standard and Monitoring Technology for Agro-products of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
| | - Shizhong Wang
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Yetao Tang
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Qingqi Lin
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
| | - Zhuobiao Ni
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
| | - Rongliang Qiu
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China.
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14
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Li HK, Xu DM, Wang JX, Xu ZL, Fu RB. The occurrence of "yellowing" phenomenon and its main driving factors after the remediation of chromium (Cr)-contaminated soils: A literature review. JOURNAL OF HAZARDOUS MATERIALS 2023; 457:131698. [PMID: 37270962 DOI: 10.1016/j.jhazmat.2023.131698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Revised: 05/13/2023] [Accepted: 05/23/2023] [Indexed: 06/06/2023]
Abstract
Chromium (Cr) is a highly toxic element, which is widely present in environment due to industrial activities. One of most applicable technique to clean up Cr pollution is chemical reduction. However, the Cr(VI) concentration in soil increases again after remediation, and meanwhile the yellow soil would appear, which is commonly called as "yellowing" phenomenon. To date, the reason behind the phenomenon has been disputed for decades. This study aimed to introduce the possible "yellowing" mechanism and the influencing factors based on the extensive literature review. In this work, the concept of "yellowing" phenomenon was explained, and the most potential reasons include the reoxidation of manganese (Mn) oxides and mass transfer were summarized. Based on the reported finding and results, the large area of "yellowing" is likely to be caused by the re-migration of Cr(VI), since it could not sufficiently contact with the reductant under the effects of the mass transfer. In addition, other driving factors also control the occurrence of "yellowing" phenomenon. This review provides valuable reference for the academic peers participating in the Cr-contaminated sites remediation.
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Affiliation(s)
- Hao-Kai Li
- Centre for Environmental Risk Management and Remediation of Soil and Groundwater, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Da-Mao Xu
- Centre for Environmental Risk Management and Remediation of Soil and Groundwater, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Jun-Xian Wang
- Centre for Environmental Risk Management and Remediation of Soil and Groundwater, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Ze-Lin Xu
- Centre for Environmental Risk Management and Remediation of Soil and Groundwater, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Rong-Bing Fu
- Centre for Environmental Risk Management and Remediation of Soil and Groundwater, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
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15
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Zhang X, Li Q, Nie K, Cao K, Liao Q, Si M, Yang Z, Yang W. Synergistic effect of sulfidated nano zerovalent iron and proton-buffering montmorillonite in reductive immobilization of alkaline Cr(VI)-contaminated soil. CHEMOSPHERE 2023; 321:138132. [PMID: 36780997 DOI: 10.1016/j.chemosphere.2023.138132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/29/2023] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
Effective remediation of Cr(VI)-contaminated soil with strong alkalinity and high Cr(VI) concentration is a severe challenge. Herein, a proton-buffering montmorillonite-supported sulfidated nano zerovalent iron (nFeS/Fe0@H-Mt) was developed for remediation of alkaline Cr(VI)-contaminated soil. The reductive efficiencies of water-soluble Cr(VI) reached 99.7%, 99.3% and 99.8% in three tested soils with initial concentrations of 439.6, 3307.5 and 4626.7 mg kg-1, respectively, after 15 d of nFeS/Fe0@H-Mt treatment. Further speciation analyses demonstrated most available Cr species (exchangeable and carbonate-bound Cr) were transformed into more stable Cr species. The leachable Cr(VI) and total Cr obtained by toxicity leaching procedures decreased to extremely low levels and maintained long-term stability for 120 d. Such superior reductive immobilization performance of FeS/Fe0@H-Mt was attributed to the synergistic effect of sulfidated nano zerovalent iron and proton-buffering montmorillonite, which induced the coordination of proton donation and electron transfer. The proton-buffering montmorillonite (H-Mt) could prevent the aggregation of nanoparticles and provide protons to accelerate the corrosion of Fe0. In addition, the FeS component improved electron selectivity and facilitated electron transfer of Fe0 to Cr(VI). Our study demonstrated that the coordination of proton donation and electron transfer significantly enhanced the Cr(VI) reduction under the alkaline condition thus leading to effective remediation of alkaline Cr(VI)-contaminated soil.
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Affiliation(s)
- Xiaoming Zhang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, PR China
| | - Qi Li
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, PR China
| | - Kai Nie
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, PR China
| | - Kaiting Cao
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, PR China
| | - Qi Liao
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, PR China
| | - Mengying Si
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, PR China
| | - Zhihui Yang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, PR China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, PR China
| | - Weichun Yang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan, 410083, PR China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, PR China.
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16
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Wang L, Luo Y, Pang J, Li Y, Wu H, Jiang X, Tong J, Shi J. Fe-biochar for simultaneous stabilization of chromium and arsenic in soil: Rational design and long-term performance. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 862:160843. [PMID: 36521603 DOI: 10.1016/j.scitotenv.2022.160843] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 11/25/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
Excess chromium (Cr) and arsenic (As) coexist in soil such as chromated copper arsenate (CCA) contaminated sites, leading to high risks of pollution. Fe-biochar with adjustable redox activity offers the possibility of simultaneous stabilization of Cr and As. Here, a series of Fe-biochar with distinct Fe/C structure were rationally produced for the remediation of Cr and As contaminated soil (BCX-Fe, X represented the biomass/Fe ratio). Adsorption tests showed that maximal adsorption of BC5-Fe for Cr(VI) and As(III) reached 73.7 and 81.3 mg/g. A 90-day soil remediation experiment indicated that the introduction of 3% (w/w) Fe-biochar reduced the leaching state of Cr(VI) by 93.8-99.7% and As by 75.2-95.6%. Under simulated groundwater erosion for 10 years and acid rain leaching for 7.5 years, the release levels of Cr(VI) and As in the BC5-Fe remediated soil could meet the groundwater class IV standard in China (Cr(VI)<0.1 mg/L, As<0.05 mg/L). Accelerated aging tests demonstrated that BC5-Fe had long-term Cr and As stabilization ability. The quenching experiment, EPR, and XPS suggested that the corrosion products of Fe dominated the adsorption and redox reactions, while the O groups acted as electron transfer stations and constituted redox microcirculation in the synchronous uptake of Cr/As. Based on these insights, we believe that our study will provide meaningful information about the application potential of Fe-biochar for the heavy metal contaminated soil remediation.
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Affiliation(s)
- Lubin Wang
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China; MOE Key laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China
| | - Yating Luo
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China
| | - Jingli Pang
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China
| | - Yifan Li
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China
| | - Hanxin Wu
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China
| | - Xiaohan Jiang
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China
| | - Jianhao Tong
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China
| | - Jiyan Shi
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China; MOE Key laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China.
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17
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Mao HT, Chen LX, Zhang MY, Shi QY, Xu H, Zhang DY, Zhang ZW, Yuan M, Yuan S, Zhang HY, Su YQ, Chen YE. Melatonin improves the removal and the reduction of Cr(VI) and alleviates the chromium toxicity by antioxidative machinery in Rhodobacter sphaeroides. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 319:120973. [PMID: 36584859 DOI: 10.1016/j.envpol.2022.120973] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 12/12/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
Bioremediation with photosynthetic bacteria (PSB) is thought to be a promising removal method for hexavalent chromium [Cr(VI)]-containing wastewater. In the present study, Rhodobacter sphaeroides (R. sphaeroides) SC01 was used for the investigation of Cr(VI) removal in Cr(VI)-contaminated solution in the presence of melatonin. It was found that exogenous melatonin alleviated oxidative damage to R. sphaeroides SC01, increased Cr (VI) absorption capacity of cell membrane, and improved the reduction efficiency of Cr(VI) via the activation of chromate reductants. The results showed that melatonin could further promote the increase in Cr(VI) removal efficiency, reaching up to 97.8%. Furthermore, melatonin application resulted in 296.9%, 44.4%, and 69.7% upregulation of ascorbic acid (AsA), glutathione (GSH), and cysteine (Cys) relative to non-melatioin treated R. sphaeroides SC01 at 48 h. In addition, the resting cells, cell-free supernatants (CFS), and cell-free extracts (CFE) with melatonin had a higher Cr(VI) removal rate of 18.6%, 82.0%, and 15.2% compared with non-melatonin treated R. sphaeroides SC01. Fourier transform infrared spectroscopy (FTIR) revealed that melatonin increased the binding of Cr(III) with PO43- and CO groups on cell membrane of R. sphaeroides SC01. X-ray diffractometer (XRD) analysis demonstrated that melatonin remarkably bioprecipitated the production of CrPO4·6H2O in R. sphaeroides SC01. Hence, these results indicated that melatonin plays the important role in the reduction and uptake of Cr(VI), demonstrating it is a great promising strategy for the management of Cr(VI) contaminated wastewater in photosynthetic bacteria.
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Affiliation(s)
- Hao-Tian Mao
- College of Life Science, Sichuan Agricultural University, 625014, Ya'an, China
| | - Lun-Xing Chen
- College of Life Science, Sichuan Agricultural University, 625014, Ya'an, China
| | - Meng-Ying Zhang
- College of Life Science, Sichuan Agricultural University, 625014, Ya'an, China
| | - Qiu-Yun Shi
- College of Life Science, Sichuan Agricultural University, 625014, Ya'an, China
| | - Hong Xu
- College of Life Science, Sichuan Agricultural University, 625014, Ya'an, China
| | - Da-Yan Zhang
- College of Life Science, Sichuan Agricultural University, 625014, Ya'an, China
| | - Zhong-Wei Zhang
- College of Resources, Sichuan Agricultural University, 611130, Chengdu, China
| | - Ming Yuan
- College of Life Science, Sichuan Agricultural University, 625014, Ya'an, China
| | - Shu Yuan
- College of Resources, Sichuan Agricultural University, 611130, Chengdu, China
| | - Huai-Yu Zhang
- College of Life Science, Sichuan Agricultural University, 625014, Ya'an, China
| | - Yan-Qiu Su
- College of Life Science, Sichuan Normal University, 610066, Chengdu, China
| | - Yang-Er Chen
- College of Life Science, Sichuan Agricultural University, 625014, Ya'an, China.
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18
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Melatonin Alleviates Chromium Toxicity in Maize by Modulation of Cell Wall Polysaccharides Biosynthesis, Glutathione Metabolism, and Antioxidant Capacity. Int J Mol Sci 2023; 24:ijms24043816. [PMID: 36835227 PMCID: PMC9966513 DOI: 10.3390/ijms24043816] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/28/2022] [Accepted: 12/31/2022] [Indexed: 02/17/2023] Open
Abstract
Melatonin, a pleiotropic regulatory molecule, is involved in the defense against heavy metal stress. Here, we used a combined transcriptomic and physiological approach to investigate the underlying mechanism of melatonin in mitigating chromium (Cr) toxicity in Zea mays L. Maize plants were treated with either melatonin (10, 25, 50 and 100 μM) or water and exposed to 100 μM K2Cr2O7 for seven days. We showed that melatonin treatment significantly decreased the Cr content in leaves. However, the Cr content in the roots was not affected by melatonin. Analyses of RNA sequencing, enzyme activities, and metabolite contents showed that melatonin affected cell wall polysaccharide biosynthesis, glutathione (GSH) metabolism, and redox homeostasis. During Cr stress, melatonin treatment increased cell wall polysaccharide contents, thereby retaining more Cr in the cell wall. Meanwhile, melatonin improved the GSH and phytochelatin contents to chelate Cr, and the chelated complexes were then transported to the vacuoles for sequestration. Furthermore, melatonin mitigated Cr-induced oxidative stress by enhancing the capacity of enzymatic and non-enzymatic antioxidants. Moreover, melatonin biosynthesis-defective mutants exhibited decreased Cr stress resistance, which was related to lower pectin, hemicellulose 1, and hemicellulose 2 than wild-type plants. These results suggest that melatonin alleviates Cr toxicity in maize by promoting Cr sequestration, re-establishing redox homeostasis, and inhibiting Cr transport from the root to the shoot.
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Yang J, Guo Q, Li L, Wang R, Chen Y, Wang X. Insights into the evolution of Cr(VI) species in long-term hexavalent chromium contaminated soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 858:160149. [PMID: 36372161 DOI: 10.1016/j.scitotenv.2022.160149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/21/2022] [Accepted: 11/08/2022] [Indexed: 06/16/2023]
Abstract
Compare to the content of Cr(VI), the distribution of specific Cr(VI) species in soil is rarely paid attention to, which may lead to an inaccurate environmental risk assessment of Cr(VI) contaminated soil or inability to meet stringent requirement for soil remediation. Herein, to reveal the primary mechanisms and factors controlling the evolution of Cr(VI) species in soil, the distribution of Cr(VI) and Cr(III) species in soils with different particle sizes and textures was systematically investigated by using a modified sequential extraction procedure and spectroscopy characterizations (e.g., SEM-EDS mapping). The results show that a significant proportion of Cr(VI) can be captured by minerals containing exchangeable calcium ions and metal oxide hydrates in the soil, forming a relatively stable adsorbed Cr(VI). Also, a small fraction of Cr(VI) can precipitate as calcium chromate with free calcium ion which is the most stable Cr(VI) species in the soil. The majority of Cr(VI) discharged into soil tends to be reduced by ferrous ions or minerals containing ferrous ions with a product of Fe(III)-Cr(III) coprecipitate. Therefore, the speciation of Cr in the soil is closely correlated to Fe and Ca. After the equilibrium of adsorption, precipitation, and reduction reactions of Cr(VI), the rest of Cr(VI) retains as the form of its original water-soluble state in soil. The evolution of Cr(VI) species and the content of specific Cr species in soil are mainly determined by the contents of iron, exchangeable calcium ions and metal oxide hydrates, which effect the Cr(VI) reduction, precipitation and adsorption, respectively.
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Affiliation(s)
- Jing Yang
- College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Qian Guo
- College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Lei Li
- College of Resources and Environment, Southwest University, Chongqing 400715, PR China.
| | - Ruixue Wang
- College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Yucheng Chen
- College of Resources and Environment, Southwest University, Chongqing 400715, PR China; Chongqing Engineering Research Center of Rural Cleaning, Chongqing 400716, PR China
| | - Xingrun Wang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
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Guo X, Zhang W, Yu H, Jin D. Reduction, stabilization, and solidification of Cr(VI) in contaminated soils with a sustainable by-product-based binder. CHEMOSPHERE 2022; 307:135902. [PMID: 35948102 DOI: 10.1016/j.chemosphere.2022.135902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 07/24/2022] [Accepted: 07/30/2022] [Indexed: 06/15/2023]
Abstract
This study evaluated the use of a sustainable GFD binder for the stabilization/solidification (S/S) of chromium VI (Cr(VI))-contaminated soil. The GFD binder was composed of ground granulated blast furnace slag (GGBFS), fly ash and desulfurization ash, named after the initials of the three materials. The effects of curing time and binder dosage on soil unconfined compressive strength (UCS), Cr leachability, soil pH, and reduction ratio of Cr (VI) were tested. The immobilization mechanisms of Cr(VI) in contaminated soil were further explored using X-ray diffraction (XRD), scanning electron microscopy (SEM), and sequential extraction procedure (SEP). The results showed that the UCS and pH of the soil increased substantially after the GFD binder was added. After 28 days of curing with a 20% binder dosage, the leached total Cr concentration decreased from 34.4 mg/L in the contaminated soil to 1.44 mg/L in the treated soil, and the leached Cr(VI) concentration decreased from 28.0 mg/L to 0.45 mg/L. A Cr(VI) reduction ratio of 96.2% was achieved, indicating the strong reducibility of GGBFS. XRD revealed that the main hydration products of the GFD binder were hydrated calcium silicate (C-S-H) and ettringite. SEM results showed that the formation of hydration products and Cr-bearing precipitates filled the soil pores, resulting in a dense soil structure. The SEP results demonstrated that the levels of the unstable fraction F1 decreased considerably, and that the levels of the stable fractions F3 and F5 increased after treatment. Encapsulation by C-S-H, reduction by sulfides, adsorption of C-S-H, and precipitation of Cr-bearing hydroxides were the main mechanisms involved in Cr immobilization using the GFD binder.
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Affiliation(s)
- Xingzhang Guo
- School of Mechanics and Engineering Science, Shanghai University, 200444, Shanghai, PR China.
| | - Wenjie Zhang
- School of Mechanics and Engineering Science, Shanghai University, 200444, Shanghai, PR China.
| | - Haisheng Yu
- School of Mechanics and Engineering Science, Shanghai University, 200444, Shanghai, PR China.
| | - Dian Jin
- School of Mechanics and Engineering Science, Shanghai University, 200444, Shanghai, PR China.
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Oral O, Yigit A, Kantar C. Role of reactor type on Cr(VI) removal by zero-valent iron in the presence of pyrite: Batch versus sequential batch reactors. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 320:115854. [PMID: 35961140 DOI: 10.1016/j.jenvman.2022.115854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 07/14/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
This study was conducted to understand the role of application sequence of pyrite and zero-valent iron (Fe0) (simultaneous vs. sequential) on chromium (VI) removal by Fe0. In batch experiments, pyrite and Fe0 were homogeneously mixed in batch reactors maintained at a constant total solids loading of 2 g L-1. In sequential batch experiments, however, the first reactor containing variable doses of pyrite was operated for 20 min, and the liquid fraction from the first reactor was then subsequently loaded into the second reactor containing a fixed Fe0 dose of 1.2 g L-1. The batch reactors achieved much higher Cr(VI) removal efficiency than sequential batch reactors under similar operating conditions due to discrepancies in Fe redox cycling activities between these two systems. In batch reactors, the Fe0 particles deposited on pyrite surface due to electrostatic attraction between negatively charged pyrite and positively charged Fe0, thus, rendering the overall solids surface charge neutral at optimum pyrite and Fe0 doses. As a result, the whole system behaved like a composite material, with pyrite functioning as a support material for Fe0. This stimulated Fe redox cycling more effectively to generate new Fe(II) sites on Fe0 for enhanced Cr(VI) removal relative to Fe0 only system. In sequential batch reactors, however, the Fe redox cycling activity was limited, but significantly increased with increasing pyrite dose in the first reactor. Overall, our results indicate that the stimulatory effect of pyrite on Cr(VI) removal by Fe0 may be much higher if the reactors are operated in batch mode.
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Affiliation(s)
- Ozlem Oral
- Canakkale Onsekiz Mart University, Department of Environmental Engineering, 17100, Canakkale, Turkey.
| | - Aynur Yigit
- Canakkale Onsekiz Mart University, Department of Environmental Engineering, 17100, Canakkale, Turkey
| | - Cetin Kantar
- Canakkale Onsekiz Mart University, Department of Environmental Engineering, 17100, Canakkale, Turkey.
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Qing Z, Guijian L, Shuchuan P, Chuncai Z, Arif M. Immobilization of hexavalent chromium in soil-plant environment using calcium silicate hydrate synthesized from coal gangue. CHEMOSPHERE 2022; 305:135438. [PMID: 35750229 DOI: 10.1016/j.chemosphere.2022.135438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 06/09/2022] [Accepted: 06/19/2022] [Indexed: 06/15/2023]
Abstract
The presence of excessive hexavalent chromium (Cr(VI)) in the contaminated soils and plants has become a global environmental issue due to its toxicity and carcinogenicity. This work investigated the feasibility of immobilizing Cr(VI) in the soil-plant environment using calcium silicate hydrate (C-S-H) synthesized from coal gangue. The results revealed that the C-S-H amendment increased soil pH and organic matter (OM), which further promoted Cr(VI) immobilization. Results also revealed that exchangeable and carbonate bound fractions of Cr were either converted into Fe/Mn oxide and OM bound fractions of Cr or hardly released residual fraction of Cr due to C-S-H treatment. The C-S-H accelerated conversion of Cr(VI) into Cr(III) promoting plant growth and alleviating the toxic effect of Cr(VI). Cr(VI) was mainly immobilized and accumulated in the plant roots which resulted in comparatively lower Cr(VI) content in the edible part of plants. The exchangeable fraction of Cr in soil could be used as a bioavailability evaluation index of Cr(VI) in plants. In short, C-S-H was proved to be a practical and environmentally friendly amendment for in-situ immobilization of Cr(VI) contaminated soil.
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Affiliation(s)
- Zhang Qing
- School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi, 710075, China
| | - Liu Guijian
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi, 710075, China; CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Peng Shuchuan
- School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China.
| | - Zhou Chuncai
- School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi, 710075, China
| | - Muhammad Arif
- CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China; Department of Soil and Environmental Sciences, Muhammad Nawaz Shareef University of Agriculture, Multan, 60000, Pakistan
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Huang M, Ding G, Yan X, Rao P, Wang X, Meng X, Shi Q. Factors Affecting the Detection of Hexavalent Chromium in Cr-Contaminated Soil. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:9721. [PMID: 35955077 PMCID: PMC9367748 DOI: 10.3390/ijerph19159721] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 08/01/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
The alkali digestion pretreatment method in the United States Environmental Protection Agency (USEPA) Method 3060A could underestimate the content of Cr(VI) in Cr-contaminated soils, especially for soils mixed with chromite ore processing residue (COPR), which leads to a misjudgment of the Cr(VI) level in soils after remediation, causing secondary pollution to the environment. In this study, a new pretreatment method to analyze Cr(VI) concentration in contaminated soils was established. The impacts of soil quality, particle size, alkali digestion time and the rounds of alkali digestion on Cr(VI) detection in contaminated soils was explored and the alkali digestion method was optimized. Compared with USEPA Method 3060A, the alkaline digestion time was prolonged to 6 h and multiple alkali digestion was employed until the amount of Cr(VI) in the last extraction was less than 10% of the total amount of Cr(VI). Because Cr(VI) in COPR is usually embedded in the mineral phase structure, the hydration products were dissolved and Cr(VI) was released gradually during the alkaline digestion process. The amount of Cr(VI) detected showed high correlation coefficients with the percentage of F1 (mild acid-soluble fraction), F2 (reducible fraction) and F4 (residual fraction). The Cr(VI) contents detected by the new alkaline digestion method and USEPA Method 3060A showed significant differences for soil samples mixed with COPR due to their high percentage of residual fraction. This new pretreatment method could quantify more than 90% of Cr(VI) in Cr-contaminated soils, especially those mixed with COPR, which proved to be a promising method for Cr(VI) analysis in soils, before and after remediation.
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Affiliation(s)
- Mingtao Huang
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, China
| | - Guoyu Ding
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, China
| | - Xianghua Yan
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Pinhua Rao
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
| | - Xingrun Wang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | | | - Qiantao Shi
- Stevens Institute of Technology, Hoboken, NJ 07030, USA
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Li C, Sun X, Zhu Y, Liang W, Nie Y, Shi W, Ai S. Core-shell structural nitrogen-doped carbon foam loaded with nano zero-valent iron for simultaneous remediation of Cd (II) and NAP in water and soil: Kinetics, mechanism, and environmental evaluation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 832:155091. [PMID: 35398127 DOI: 10.1016/j.scitotenv.2022.155091] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 03/31/2022] [Accepted: 04/03/2022] [Indexed: 06/14/2023]
Abstract
An economical, efficient, and environmentally friendly technology was developed for simultaneous remediation of heavy metals and polycyclic aromatic hydrocarbons (PAHs) in soil and water. In this study, using pinecones powder as the precursor, the core-shell structural nitrogen-doped carbon foam loaded with nano zero-valent iron (nZVI@NCF) was synthesized through Mannich reaction and high-temperature carbon reduction. The nZVI@NCF was applied as the adsorbent and catalyst to simultaneously remediate the composite pollutants of Cd (II) and naphthalene (NAP). Under the optimal conditions, the adsorption capacity of Cd (II) in water and soil were 13.9 mg·g-1 and 1.97 mg·g-1, respectively, and the adsorption process conformed to the pseudo-second-order kinetic model. The degradation rates of NAP in water (10 mg·L-1) reached almost 100% as well as it could reach 59.12% in soil (10 mg·kg-1). In addition, it was proved that the presence of NAP could compete with Cd (II) for the active sites on the surface of the material to inhibit the adsorption of Cd (II), while the co-existence of Cd (II) could improve the degradation of NAP by the nZVI@NCF/PMS system due to the nZVI-Cd bimetallic effect and the pro-oxidant effect of Cd (II) promoting the generation of ROS. The free radical quenching experiment revealed that the generated ·O2- was the main substance that mediated the redox of nZVI/Fe2+/Fe3+ to oxidative NAP during the degradation process. Furthermore, the results of the phytotoxicity test demonstrated that the nZVI@NCF/PMS system could effectively remediate the soil co-contaminated with Cd (II) and NAP as well as improve the soil environment quality. This research will provide new materials and potential technologies for the efficient treatment of the composite pollutants in the environment.
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Affiliation(s)
- Changyu Li
- College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, Shandong, PR China
| | - Xiaoting Sun
- College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, Shandong, PR China
| | - Yifan Zhu
- College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, Shandong, PR China
| | - Wenxu Liang
- College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, Shandong, PR China
| | - Yongxin Nie
- College of Life Sciences, Shandong Agricultural University, Taian 271018, Shandong, PR China
| | - Weijie Shi
- College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, Shandong, PR China.
| | - Shiyun Ai
- College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, Shandong, PR China.
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25
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Combined Treatment of Cr(VI)-Contaminated Soils by Reduction, Adsorption, and Solidification. SUSTAINABILITY 2022. [DOI: 10.3390/su14148827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Remediation of Cr(VI)-contaminated soil usually includes reducing Cr(VI) to Cr(III) with sub-sequent solidification. In this paper, a treatment technique that combines reduction, adsorption, and solidification was proposed. By introducing an adsorbent into the reduction process, the remediation effectiveness was improved and the amount of reducing and solidified agent was decreased. Synthetic precipitation leaching procedure (SPLP), unconfined compressive strength (UCS) test, and scanning electron microscope (SEM) analysis were carried out to evaluate the remediation effect under different agent combinations and different agent-adding procedures. The results of SPLP showed that the reduction/adsorption/solidification treatment significantly reduced the leachability of Cr. UCS increased with increasing dosage of cement and CaS5, and decreased with an increasing dosage of vermiculite. The best agent dosage was CaS5 of 2 times molar stoichiometric ratio of Cr(VI), 15% of vermiculite, and 20% of cement. Orthogonal test showed that for soil with low Cr(VI) content, CaS5 dosage was the most important factor that affected the leachability of Cr. Cement and vermiculite have greater impact in limiting the leachability of Cr when Cr(VI) content in soil increased.
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26
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Liu Y, Jia J, Zhang H, Sun S. Enhanced Cr(VI) stabilization in soil by chitosan/bentonite composites. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 238:113573. [PMID: 35500403 DOI: 10.1016/j.ecoenv.2022.113573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/13/2022] [Accepted: 04/26/2022] [Indexed: 06/14/2023]
Abstract
In this study, chitosan/bentonite composites (CSBT) was synthesized and applied to the immobilization of chromium in the soil. The influence of passivating agents on various forms of chromium was investigated by batch experiment. The results showed that CSBT could reduce the content of exchangeable form and oxidizable form, while increase the content of residual form of chromium. The addition of 0.2 g·kg-1 CSBT had the best effect, with the concentration of exchangeable, reducible and oxidizable form decreased by 46.74%, 8.15%, and 14.46%, respectively. During the experiment time, the passivation effect increased rapidly within 14 days, and the content of residual form in the total Cr increased from 0.76% to 14.23%, the equilibrium was reached at the 28th day and was basically maintained in the subsequent period. CSBT had little impact on soil pH, and soil pH maintained constant during the experiment period. The amino, carboxyl and hydroxyl groups of CSBT promoted the conversion of available chromium to residual state in soil, and reduced the bioavailability of chromium in soil.
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Affiliation(s)
- Yanjun Liu
- College of Resources and Environment, Shandong Agricultural University, Taian, Shandong 271018, China
| | - Junjie Jia
- College of Resources and Environment, Shandong Agricultural University, Taian, Shandong 271018, China
| | - Huifeng Zhang
- College of Resources and Environment, Shandong Agricultural University, Taian, Shandong 271018, China
| | - Shujuan Sun
- College of Resources and Environment, Shandong Agricultural University, Taian, Shandong 271018, China.
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Zhang L, He F, Guan Y. Immobilization of hexavalent chromium in contaminated soil by nano-sized layered double hydroxide intercalated with diethyldithiocarbamate: Fraction distribution, plant growth, and microbial evolution. JOURNAL OF HAZARDOUS MATERIALS 2022; 430:128382. [PMID: 35739652 DOI: 10.1016/j.jhazmat.2022.128382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 01/10/2022] [Accepted: 01/26/2022] [Indexed: 06/15/2023]
Abstract
Soil contamination by hexavalent chromium (Cr(VI)) poses great risks to human health and ecosystem safety. We introduced a new cheap and efficient layered double hydroxide intercalated with diethyldithiocarbamate (DDTC-LDH) for in-situ remediation of Cr(VI)-contaminated soil. The content of Cr(VI) in contaminated soil (134.26 mg kg-1) was rapidly reduced to 1.39 mg kg-1 within 10 days by 0.5% of DDTC-LDH. This result attains to or even exceeds the effectiveness of most of reported soil amendments for Cr(VI) removal in soils. The production cost of DDTC-LDH ($4.02 kg-1) was relatively low than some common materials, such as nano zero-valent iron ($22.80-140.84 kg-1). The growth of water spinach became better with the increase of DDTC-LDH dose from 0% to 0.5%, suggesting the recovery of soil function. DDTC-LDH significantly altered the structure and function of soil microbial communities. The species that have Cr(VI)-resistant or Cr(VI)-reductive ability were enriched in DDTC-LDH remediated soils. Network analysis revealed a significant functional niche differentiation of soil microbial communities. In addition to the enhancement of Cr(VI) reduction, the stimulation of plant growth promoting traits, including siderophore biosynthesis, oxidation resistance to reactive oxygen species, and phosphorus availability by DDTC-LDH was another essential mechanism for the immediate remediation of Cr(VI)-contaminated soil.
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Affiliation(s)
- Lixun Zhang
- Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China
| | - Fangxin He
- Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China
| | - Yuntao Guan
- Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China.
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Li Q, Zhang Y, Yu L, Cao K, Si M, Liao Q, Zhao F, Yang W, Yang Z. Performance and mechanisms of microwave-assisted zerovalent iron/pyrite for advance remediation of strongly alkaline high Cr(VI) contaminated soil. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 298:118855. [PMID: 35051549 DOI: 10.1016/j.envpol.2022.118855] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/25/2021] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
Strongly alkaline high Cr(VI) contaminated (SAHCR) soil poses a high risk to the environment and public health, yet lacks rapid and efficient remediation technology. In this study, a novel approach combining microwave irradiation with zerovalent iron/pyrite (FeS2/ZVI) was developed for the remediation of SAHCR soil. The results indicated that fast and efficient remediation of the SAHCR soil was achieved by microwave irradiation-assisted FeS2/ZVI, with 99.9% of removal rate of Cr(VI) within 10 min, and Cr(VI) concentration from 3900.8 plummeted to 2.38 mg kg-1. The data of Cr(VI) reduction kinetics at different temperatures indicated that the activation energies (Ea) for microwave-FeS2/ZVI system was 27.4 kJ mol-1, 28.5% lower than that without microwave irradiation, suggesting that in addition to the heating effect of microwave, the accelerated Cr(VI) reduction also comes from the catalytic effect of "hot spots" on FeS2/ZVI under microwave irradiation. Furthermore, it was demonstrated that microwave irradiation promoted the transformation of reduced Cr(III) into the stable FeCr2O4 mineral and the excellent long-term stability of the remediated SAHCR soil. These findings can provide a perspective for advanced remediation of the difficult-to-treat SAHCR soil by the synergism of microwave irradiation with the iron-sulfur based reducing materials.
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Affiliation(s)
- Qi Li
- School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China
| | - Yujia Zhang
- School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China
| | - Lin Yu
- School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China
| | - Kaiting Cao
- School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China
| | - Mengying Si
- School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China; Chinese National Engineering Research Centre for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, PR China
| | - Qi Liao
- School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China; Chinese National Engineering Research Centre for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, PR China
| | - Feiping Zhao
- School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China; Chinese National Engineering Research Centre for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, PR China
| | - Weichun Yang
- School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China; Chinese National Engineering Research Centre for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, PR China.
| | - Zhihui Yang
- School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China; Chinese National Engineering Research Centre for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, PR China
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29
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Liang W, Wang G, Peng C, Tan J, Wan J, Sun P, Li Q, Ji X, Zhang Q, Wu Y, Zhang W. Recent advances of carbon-based nano zero valent iron for heavy metals remediation in soil and water: A critical review. JOURNAL OF HAZARDOUS MATERIALS 2022; 426:127993. [PMID: 34920223 DOI: 10.1016/j.jhazmat.2021.127993] [Citation(s) in RCA: 50] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 11/30/2021] [Accepted: 12/02/2021] [Indexed: 06/14/2023]
Abstract
Heavy metal pollution in soil and water has presented a new challenge for the environmental remediation technology. Nano zero valent iron (nZVI) has excellent adsorbent properties for heavy metals, and thus, exhibits great potential in environmental remediation. Used as supporting materials for nZVI, carbon-based materials, such as activated carbon (AC), biochar (BC), carbon nanotubes (CNTs), and graphene (GNs) with aromatic rings formed by carbon atoms as the skeleton, have a large specific surface area and porous structure. This paper provides a comprehensive review on the advancement of carbon-based nano zero valent iron (C-nZVI) particles for heavy metal remediation in soil and water. First, different types of carbon-based materials and their combination with nZVI, as well as the synthesis methods and common characterization techniques of C-nZVI, are reviewed. Second, the mechanisms for the interactions between contaminants and C-nZVI, including adsorption, reduction, and oxidation reactions are detailed. Third, the environmental factors affecting the remediation efficiency, such as pH, coexisting constituents, oxygen, contact time, and temperature, are highlighted. Finally, perspectives on the challenges for utilization of C-nZVI in the actual contaminated soil and water and on the long-term efficacy and safety evaluation of C-nZVI have been proposed for further development.
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Affiliation(s)
- Weiyu Liang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Gehui Wang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Cheng Peng
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China; Shanghai Academy of Environmental Sciences, Shanghai 200233, China.
| | - Jiaqi Tan
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Jiang Wan
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Pengfei Sun
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China
| | - Qiannan Li
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xiaowen Ji
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Qi Zhang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yonghong Wu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China
| | - Wei Zhang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China; Shanghai Academy of Environmental Sciences, Shanghai 200233, China.
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Song B, Zeng Z, Almatrafi E, Shen M, Xiong W, Zhou C, Wang W, Zeng G, Gong J. Pyrite-mediated advanced oxidation processes: Applications, mechanisms, and enhancing strategies. WATER RESEARCH 2022; 211:118048. [PMID: 35074575 DOI: 10.1016/j.watres.2022.118048] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 12/30/2021] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
Proper treatment of wastewater is one of the key issues to the sustainable development of human society, and people have been searching for high-efficiency and low-cost methods for wastewater treatment. This article reviews recent studies about pyrite-mediated advanced oxidation processes (AOPs) in removing refractory organics from wastewater. The basic information of pyrite and its characteristics for AOPs are first introduced. Then, the performance and mechanisms of pyrite-mediated Fenton oxidation, electro-Fenton oxidation, and persulfate oxidation processes are carefully reviewed and presented. Natural pyrite is an abundant low-cost heterogeneous catalyst for AOPs, and the slow release of Fe2+ and the self-regulation of solution pH are highlighted characteristics of pyrite-mediated AOPs. In AOPs, the interaction between Fe3+ and pyrite facilitates the Fe2+ regeneration and the Fe2+/Fe3+ cycle. Making pyrite into nanoparticles, assisting by ultrasound and light irradiation, and adding exogenous Fe3+, organic chelating agents, or biochar is effective to enhance the performance of pyrite-mediated AOPs. Based on the analyses of those pyrite-mediated AOPs and their enhancing strategies, the future development directions are proposed in the aspects of toxicity research, mechanism research, and technological coupling.
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Affiliation(s)
- Biao Song
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China; Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha 410011, PR China; Center of Research Excellence in Renewable Energy and Power Systems, Center of Excellence in Desalination Technology, Department of Mechanical Engineering, Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Zhuotong Zeng
- Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha 410011, PR China
| | - Eydhah Almatrafi
- Center of Research Excellence in Renewable Energy and Power Systems, Center of Excellence in Desalination Technology, Department of Mechanical Engineering, Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Maocai Shen
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China
| | - Weiping Xiong
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China; Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha 410011, PR China; Center of Research Excellence in Renewable Energy and Power Systems, Center of Excellence in Desalination Technology, Department of Mechanical Engineering, Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Chengyun Zhou
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China; Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha 410011, PR China; Center of Research Excellence in Renewable Energy and Power Systems, Center of Excellence in Desalination Technology, Department of Mechanical Engineering, Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Wenjun Wang
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China
| | - Guangming Zeng
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China; Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha 410011, PR China; Center of Research Excellence in Renewable Energy and Power Systems, Center of Excellence in Desalination Technology, Department of Mechanical Engineering, Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
| | - Jilai Gong
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China; Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha 410011, PR China; Center of Research Excellence in Renewable Energy and Power Systems, Center of Excellence in Desalination Technology, Department of Mechanical Engineering, Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
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Wang G, Yang Y, Kong Y, Ma R, Yuan J, Li G. Key factors affecting seed germination in phytotoxicity tests during sheep manure composting with carbon additives. JOURNAL OF HAZARDOUS MATERIALS 2022; 421:126809. [PMID: 34388932 DOI: 10.1016/j.jhazmat.2021.126809] [Citation(s) in RCA: 66] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/22/2021] [Accepted: 07/31/2021] [Indexed: 06/13/2023]
Abstract
The germination index (GI) was widely applied to evaluate the phytotoxicity of compost. This study investigated the key phytotoxicity factors affecting seed germination in compost by using aqueous extracts in seed germination tests. The relationship between water-soluble substances in compost and seed germination, and their association with the microbial community were identified. In this study, sheep manure (SM) composted along or with three carbon additives (mushroom substrate, MS; cornstalks, CS; garden substrate, GS) for 49 days and, during this time, changes in multiple physical-chemical parameters, carbon and nitrogen matters, germination indexes (GI) and the compost microbiome were monitored. The results showed that all additives decreased water-soluble total nitrogen (TN), ammonium nitrogen (NH4+-N) and low molecular weight organic acids, and significantly improved the seed germination indexes (seed germination rate, radical length and GI). The GI was correlated with water-soluble carbon degradation products (TOC, butyric acid, humic acid) and certain bacteria (Planifilum, Oceanobacillus, Ruminococcaceae_UCG_005 and Saccharomonospora). A structural equation model revealed that the main factors affecting seed germination were TOC (SM compost), acetic acid (SM+MS compost), humic acid (SM+CS compost), and pH (SM+GS compost). Low TOC and low molecular weight organic acids contents and higher humic acid content promoted GI. The research results could provide theoretical basis and measures for directional regulation of compost maturity.
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Affiliation(s)
- Guoying Wang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China
| | - Yan Yang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China
| | - Yilin Kong
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China
| | - Ruonan Ma
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China
| | - Jing Yuan
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China.
| | - Guoxue Li
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China.
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Li C, Zhu Y, Zhang T, Nie Y, Shi W, Ai S. Iron nanoparticles supported on N-doped carbon foam with honeycomb microstructure: An efficient potassium peroxymonosulfate activator for the degradation of fluoranthene in water and soil. CHEMOSPHERE 2022; 286:131603. [PMID: 34325259 DOI: 10.1016/j.chemosphere.2021.131603] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 07/11/2021] [Accepted: 07/17/2021] [Indexed: 06/13/2023]
Abstract
A promising technology was developed for the remediation of fluoranthene (FLT) contaminated water and soil. Specifically, iron nanoparticles supported on N-doped carbon foam (Fe@CF-N) was synthesized by in-situ impregnation and a unique calcination process using pine cone as the precursor. The obtained Fe@CF-N was used as an activator of potassium peroxymonosulfate (PMS) to degrade FLT in water and soil. According to experimental results, Fe@CF-N had a three-dimensional network structure with a large specific surface area of 249.0 m2 g-1, displaying excellent catalytic performance. The maximum removal efficiency of FLT in water and soil reached 81.83% and 78.12% within 180 min, respectively. After four consecutive degradation cycles, the removal efficiency of FLT in water was still 55%. Electron spin resonance (ESR) measurements showed that hydroxyl radicals (·OH), sulfate radical (SO4-·) and 1O2 were the major reactive oxygen species (ROS). A series of low molecular weight intermediates were generated during the FLT degradation progress, such as C6H6O3 and C3H8O2. The effect of Fe@CF-N/PMS system on the phytotoxicity was evaluated via bioassay based on peas. The results indicated that seed germination rate and root shoot elongation of remediated soil by Fe@CF-N/PMS system were not significantly different from those of noncontaminated soil. This study provided a cost-effective remediation option for PAHs contaminated water and soil.
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Affiliation(s)
- Changyu Li
- College of Chemistry and Material Science, Shandong Agricultural University, Taian, 271018, Shandong, PR China.
| | - Yifan Zhu
- College of Chemistry and Material Science, Shandong Agricultural University, Taian, 271018, Shandong, PR China.
| | - Ting Zhang
- College of Chemistry and Material Science, Shandong Agricultural University, Taian, 271018, Shandong, PR China.
| | - Yongxin Nie
- College of Life Sciences, Shandong Agricultural University, Taian, 271018, Shandong, PR China.
| | - Weijie Shi
- College of Chemistry and Material Science, Shandong Agricultural University, Taian, 271018, Shandong, PR China.
| | - Shiyun Ai
- College of Chemistry and Material Science, Shandong Agricultural University, Taian, 271018, Shandong, PR China.
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Rodríguez DM, Mayordomo N, Schild D, Shams Aldin Azzam S, Brendler V, Müller K, Stumpf T. Reductive immobilization of 99Tc(VII) by FeS 2: The effect of marcasite. CHEMOSPHERE 2021; 281:130904. [PMID: 34289606 DOI: 10.1016/j.chemosphere.2021.130904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/04/2021] [Accepted: 05/13/2021] [Indexed: 06/13/2023]
Abstract
Reductive immobilization of 99Tc by a synthetic FeS2 mixture, i.e. marcasite-pyrite 60:40, was studied by a combined approach of batch experiments and powder X-ray diffraction, X-ray photoelectron spectroscopy as well as Raman microscopy. It was found that the FeS2 mixture removes 100% of Tc from the suspension after 7 days in contact at 6.0 < pH ≤ 9.0. The retention outside that pH range was slower and incomplete. Spectroscopic analysis showed that the redox active species at pH 6.0 is Fe2+ as expected from previous works with pyrite. However, at pH 10.0 the surprising oxidation of S2- to SO42- was found responsible for Tc immobilization. This was explained by the high reactivity of marcasite that is easily oxidized to produce H2SO4. Our work provides new molecular insights into the reductive mobilization of Tc(VII) by oxidative formation of sulfate. The assigned molecular reactions may also be relevant for the assessment of other redox reactive contaminants. Technetium re-oxidation experiments showed that the fast oxidation of marcasite is associated to the reduction of the remaining Tc(VII) in solution, which gives marcasite the potential of Tc natural remediation since it delays the re-oxidation of Tc(IV).
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Affiliation(s)
- Diana M Rodríguez
- Helmholtz-Zentrum Dresden - Rossendorf (HZDR), Institute of Resource Ecology, Bautzner Landstraße 400, 01328, Dresden, Germany
| | - Natalia Mayordomo
- Helmholtz-Zentrum Dresden - Rossendorf (HZDR), Institute of Resource Ecology, Bautzner Landstraße 400, 01328, Dresden, Germany.
| | - Dieter Schild
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Salim Shams Aldin Azzam
- Helmholtz-Zentrum Dresden - Rossendorf (HZDR), Institute of Resource Ecology, Bautzner Landstraße 400, 01328, Dresden, Germany
| | - Vinzenz Brendler
- Helmholtz-Zentrum Dresden - Rossendorf (HZDR), Institute of Resource Ecology, Bautzner Landstraße 400, 01328, Dresden, Germany
| | - Katharina Müller
- Helmholtz-Zentrum Dresden - Rossendorf (HZDR), Institute of Resource Ecology, Bautzner Landstraße 400, 01328, Dresden, Germany.
| | - Thorsten Stumpf
- Helmholtz-Zentrum Dresden - Rossendorf (HZDR), Institute of Resource Ecology, Bautzner Landstraße 400, 01328, Dresden, Germany
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Tang J, Zhao B, Lyu H, Li D. Development of a novel pyrite/biochar composite (BM-FeS 2@BC) by ball milling for aqueous Cr(VI) removal and its mechanisms. JOURNAL OF HAZARDOUS MATERIALS 2021; 413:125415. [PMID: 33626470 DOI: 10.1016/j.jhazmat.2021.125415] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/27/2021] [Accepted: 02/10/2021] [Indexed: 06/12/2023]
Abstract
As a natural reduction mineral, pyrite (FeS2), was combined with biochar by simply ball milling technology to synthesize FeS2@biochar composite (BM-FeS2@BC) and applied for the removal of hexavalent chromium (Cr(VI)) in aqueous solution. SEM, XRD, FTIR, and XPS characterization results showed that the FeS2 and biochar were successfully combined and biochar suppressed the agglomeration of FeS2. Batch sorption experiments showed that the BM-FeS2@BC700 composite (mass ratio of FeS2-to-biochar = 3:1) had enhanced Cr(VI) removal capacity of 134 mg·g-1, which were 3-25 times higher than those of the corresponding pristine and ball-milled biochar and FeS2. The removal of Cr(VI) by BM-FeS2@BC700 was dosage and pH dependent. The addition of oxalic acid (OA) exhibited a promotion effect on the removal of Cr(VI) by increasing the removal rate of Cr(VI) from 56% to 100%. Reduction, adsorption, and surface complexation were the dominate mechanisms for Cr(VI) removal by BM-FeS2@BC700. At the equilibrium Cr(VI) concentration of 15.7 mg·L-1, 92.25% of Cr(VI) was removed through reduction/precipitation and 8.75% was removed by adsorption/surface complexation. The fitting results of the Langmuir model proved that the removal of Cr(VI) by BM-FeS2@BC700 composite was chemical surface monolayer adsorption. This work demonstrates the potential of ball milling for the preparation of FeS2@BC composite to remove Cr(VI) from water and wastewater.
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Affiliation(s)
- Jingchun Tang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Beibei Zhao
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Honghong Lyu
- Tianjin Key Laboratory of Clean Energy and pollution control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China.
| | - Ding Li
- BCIG Environmental Remediation Co., Ltd, Tianjin 300042, China
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Yin N, Zhao Y, Wang P, Du H, Yang M, Han Z, Chen X, Sun G, Cui Y. Effect of gut microbiota on in vitro bioaccessibility of heavy metals and human health risk assessment from ingestion of contaminated soils. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 279:116943. [PMID: 33770653 DOI: 10.1016/j.envpol.2021.116943] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 02/19/2021] [Accepted: 03/11/2021] [Indexed: 06/12/2023]
Abstract
To identify the role of gut microbiota in human health risk assessment, the bioaccessibility of heavy metals in 14 soil samples were determined in simulated gastrointestinal fluids. Compared to the small intestinal phase, the bioaccessibility values of the colon phase varied, either increased by 3.5-fold for As, by 2.2-fold for Cr, and by 1.6-fold for Ni, or reduced by 4.4-fold for Cu, respectively. The colon incubation with adult gut microbiota yielded higher bioaccessibility value of As (1.3 times) and Fe (3.4 times) than that of the child in most soil samples. Colon bioaccessibility was about 60% greater of Cd for the adult and 30% higher of Cr for the child. Congruent data on the bioaccessibility of Cu and Ni was observed. In addition, correlation analysis indicated that in vitro bioaccessibility was primarily related to total concentrations of heavy metals in soils, followed by soil pH and active Fe/Mn oxide. Significantly, risk assessment calculated based on colon bioaccessibility indicated that the target hazard quotient (THQ > 1) of As was presented in 3 soil samples for the adult (1.05-3.35) and in 9 soil samples for the child (1.06-26.93). The hazard index (HI) of the child was 4.00 on average, greater than that of the adult (0.62), primarily due to the contribution of As and Cd. It suggested non-carcinogenic risks are likely to occur in children through typical hand-to-mouth behavior. The adjustment of colon bioaccessibility will result in more accurate risk assessment of human exposure to heavy metals from oral ingestion of contaminated soils.
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Affiliation(s)
- Naiyi Yin
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Yongli Zhao
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Pengfei Wang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Huili Du
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Mei Yang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Zeliang Han
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, PR China; Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment and Resources, Fuzhou University, Fuzhou, 350108, PR China
| | - Xiaochen Chen
- Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment and Resources, Fuzhou University, Fuzhou, 350108, PR China
| | - Guoxin Sun
- Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Yanshan Cui
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China.
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Yang Z, Zhang X, Jiang Z, Li Q, Huang P, Zheng C, Liao Q, Yang W. Reductive materials for remediation of hexavalent chromium contaminated soil - A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 773:145654. [PMID: 33582355 DOI: 10.1016/j.scitotenv.2021.145654] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 01/18/2021] [Accepted: 02/01/2021] [Indexed: 06/12/2023]
Abstract
Chemical reduction of Cr(VI) to Cr(III) by reductive materials is the most widely used technology for the remediation of Cr(VI)-contaminated soil due to its high efficiency, adaptability and low cost. This paper reviews chromium chemistry and the materials that can effectively reduce Cr(VI) to Cr(III) for the remediation of Cr(VI)-contaminated soil, namely iron-bearing reductants, sulfur-based compounds and organic amendments. Moreover, we discuss the corresponding mechanisms involved in the process of immobilization of Cr(VI) in polluted soil, and emphasize the relationship between the materials remediation performance and soil environmental conditions. Besides, perspectives on the potential future researches of novel materials design and technological development in the remediation of Cr(VI) contaminated soil are also put forward.
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Affiliation(s)
- Zhihui Yang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, PR China
| | - Xiaoming Zhang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China
| | - Zhi Jiang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China
| | - Qi Li
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China
| | - Peicheng Huang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China
| | - Chujing Zheng
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China
| | - Qi Liao
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, PR China
| | - Weichun Yang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha, Hunan 410083, PR China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, PR China.
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