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Li X, Li T, Wei Y, Jin X, Pillai SC, Zhang J, Chen D, Wu X, Bao Y, Jiang X, Wang H. New insights into interfacial dynamics and mechanisms of biochar-derived dissolved organic matter on arsenic redistribution in Schwertmannite. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2025; 366:125419. [PMID: 39615573 DOI: 10.1016/j.envpol.2024.125419] [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: 09/16/2024] [Revised: 11/05/2024] [Accepted: 11/28/2024] [Indexed: 01/26/2025]
Abstract
Biochar is extensively utilized for the remediation of environments contaminated with heavy metals (HMs). However, its derived-dissolved organic matter (BDOM) can interact with iron oxides, which may adversely influence the retention of HMs. This study investigates the effect of BDOM derived from tobacco stalk (TS) and tobacco petiole (TP) biochar on the redistribution behavior of As(V) in acid mine drainage (AMD)-impacted environments, particularly concentrating on the interactions with Schwertmannite (Sch). Results showed that TP-BDOM, abundant in lignin-like compounds, led to a low-amplitude release of As(V) from Sch under acidic conditions, reaching a maximum value (19.84 μg L-1), significantly lower than the release caused by TS-BDOM (87.46 μg L-1). Subsequently, 88.2% of the released As(V) were re-adsorbed in the TS-BDOM system, while 47.5% were retained in the TP-BDOM system. XRD analysis, in conjunction with SEM and STEM characterizations, confirmed that there were no additional crystalline phases or alterations in the microscopic morphological features of the particles throughout the reaction process. In-situ ATR-FTIR, complemented by 2D-COS analysis, demonstrated that aromatic N-OH groups and carboxylic in BDOMs coordinated to As-Sch, enhancing sulfate and As(V) release. It was also noted that no As(III) was detected under the influences of TP- and TS-BDOM. XPS results indicated that As(V) remained the predominant redox species even in the presence of BDOMs. These findings enhance our insight into BDOM's role in As(V) fate and transport within AMD-contaminated environments.
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Affiliation(s)
- Xiaofei Li
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, PR China.
| | - Tianfu Li
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, PR China
| | - Yanfu Wei
- National Observation and Research Station of Coastal Ecological Environments in Macao, Macao Environmental Research Institute, Macau University of Science and Technology, Taipa, Macao, 999078, PR China
| | - Xiaohu Jin
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| | - Suresh C Pillai
- Nanotechnology and Bio-Engineering Research Group, Department of Environmental Science, Atlantic Technological University, ATU Sligo, Ash Lane, Sligo, F91 YW50, Ireland
| | - Jun Zhang
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, PR China
| | - Dian Chen
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, PR China
| | - Xiaolian Wu
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, PR China
| | - Yanping Bao
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, PR China
| | - Xueding Jiang
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, PR China
| | - Hailong Wang
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, PR China; Guangdong Provincial Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou, 510650, PR China
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Liu M, Liu X, Hu Y, Zhang Q, Farooq U, Qi Z, Lu L. Mobility of biochar-derived dissolved organic matter and its effects on sulfamerazine transport through saturated soil porous media. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2024; 26:2264-2278. [PMID: 39526417 DOI: 10.1039/d4em00143e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2024]
Abstract
Dissolved organic matter (DOM) released from biochar may impact antibiotic mobility and environmental fate in subsurface environments. Here, DOM samples derived from biochars (BDOM) generated by pyrolyzing corn straw at 300, 450, and 600 °C were employed to elucidate the mobility characteristics of these organic substances and their influences on the transport of sulfamerazine (SMZ, a typical sulfonamide antibiotic) in soil porous media. The results demonstrated that BDOM produced at a lower pyrolysis temperature exhibited greater mobility owing to the weaker hydrophobic and H-bonding interactions between BDOM and soil particles. Additionally and importantly, BDOM facilitated the promotion of SMZ mobility owing to the increased electrostatic repulsion between SMZ- forms and soil grains, the steric hindrance effect induced by the deposition of organic matter, and the competitive retention between SMZ molecules and BDOM. Meanwhile, the promotion effects of BDOM enhanced with improving pyrolysis temperature owing to the promoted deposition of organic matter on soil surfaces and the strengthened electrostatic repulsion. Moreover, the facilitated effects of BDOM on SMZ mobility declined as the solution pH values were raised from 5.0 to 9.0 or the flow rate increased from 0.18 to 0.51 cm min-1. This trend was due to decreased deposition competition and the steric effect caused by decreased retention of BDOM on soil particles. Furthermore, the cation-bridging effect emerged as an important mechanism contributing to the promotion effects of BDOM when the solution contained divalent cations (Cu2+ or Ca2+). Moreover, a two-site non-equilibrium model was used to interpret the controlling mechanisms for the effects of BDOM on the transport of SMZ. Findings from this work highlight that biochar-derived dissolved organic matter can remarkably affect the environmental behaviors of antibiotics in aquatic environments.
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Affiliation(s)
- Mengya Liu
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, P. R. China
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, P. R. China.
| | - Xiaochen Liu
- Hydrogeology and Engineering Geology Institute of Hubei Geological Bureau, Jinzhou, 434020, P. R. China
| | - Yalu Hu
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, P. R. China
| | - Qiang Zhang
- Ecology Institute of the Shandong Academy of Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, P. R. China
| | - Usman Farooq
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, P. R. China.
| | - Zhichong Qi
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, P. R. China.
| | - Laotao Lu
- College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, 225009, P. R. China.
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Zhu X, Beiyuan J, Ju W, Qiu T, Cui Q, Chen L, Chao H, Shen Y, Fang L. Inoculation with Bacillus thuringiensis reduces uptake and translocation of Pb/Cd in soil-wheat system: A life cycle study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 945:174032. [PMID: 38885714 DOI: 10.1016/j.scitotenv.2024.174032] [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: 03/27/2024] [Revised: 05/31/2024] [Accepted: 06/14/2024] [Indexed: 06/20/2024]
Abstract
Microbial inoculation is an important strategy to reduce the supply of heavy metals (HMs) in soil-crop systems. However, the mechanisms of microbial inoculation for the availability of HMs in soil and their accumulation/transfer in crops remain unclear. Here, the inhibitory effect of inoculation with Bacillus thuringiensis on the migration and accumulation of Pb/Cd in the soil-wheat system during the whole growth period was investigated by pot experiments. The results showed that inoculation with Bacillus thuringiensis increased soil pH and available nutrients (including carbon, nitrogen, and phosphorus), and enhanced the activities of nutrient-acquiring enzymes. Dominance analysis showed that dissolved organic matter (DOM) is the key factor affecting the availability of HMs. The content of colored spectral clusters and humification characteristics of DOM were significantly improved by inoculation, which is conducive to reducing the availability of Pb/Cd, especially during the flowering stage, the decrease was 12.8 %. Inoculation decreased Pb/Cd accumulation in the shoot and the transfer from root to shoot, with the greatest decreases at the jointing and seedling stages (27.0-34.1 % and 6.9-11.8 %), respectively. At the maturity stage, inoculation reduced the Pb/Cd accumulation in grain (12.9-14.7 %) and human health risk (4.1-13.2 %). The results of Pearson correlation analysis showed that the availability of Pb/Cd was positively correlated with the humification of DOM. Least square path model analysis showed that Bacillus thuringiensis could significantly reduce Pb/Cd accumulation in the grain and human health risks by regulating DOM spectral characteristics, the availability of HMs in soil and metals accumulation/transport in wheat at different growth stages. This study revealed the inhibition mechanism of Bacillus thuringiensis on migration of Pb/Cd in a soil-wheat system from a viewpoint of a full life cycle, which offers a valuable reference for the in-situ remediation of HM-contaminated soil and the safe production of food crops in field.
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Affiliation(s)
- Xiaozhen Zhu
- Key Laboratory of Green Utilization of Critical Non-metallic Mineral Resources, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China
| | - Jingzi Beiyuan
- School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, China
| | - Wenliang Ju
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Tianyi Qiu
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China
| | - Qingliang Cui
- Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China
| | - Li Chen
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China
| | - Herong Chao
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China
| | - Yufang Shen
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China
| | - Linchuan Fang
- Key Laboratory of Green Utilization of Critical Non-metallic Mineral Resources, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China.
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Wang Y, Li J, Li Q, Xu L, Ai Y, Liu W, Zhou Y, Zhang B, Guo N, Cao B, Qu J, Zhang Y. Effective amendment of cadmium in water and soil before and after aging of nitrogen-doped biochar: Preparation optimization, removal efficiency and mechanism. JOURNAL OF HAZARDOUS MATERIALS 2024; 477:135356. [PMID: 39094312 DOI: 10.1016/j.jhazmat.2024.135356] [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: 06/08/2024] [Revised: 07/21/2024] [Accepted: 07/26/2024] [Indexed: 08/04/2024]
Abstract
Nitrogen-doped biochar (NBC) is a green material for remediating heavy metal pollution, but it undergoes aging under natural conditions, affecting its interaction with heavy metals. The preparation conditions of NBC were optimized using response surface methodology (RSM), and NBC was subjected to five different aging treatments to analyze the removal efficiency of Cd(II) and soil remediation capability before and after aging. The results indicated that NBC achieved optimal performance with a mass ratio of 5:2.43, an immersion time of 10.66 h, and a pyrolysis temperature of 900 °C. Aging diminished NBC's adsorption capacity for Cd(II) but did not change the main removal mechanism of monolayer chemical adsorption. Freeze-thaw cycles (FT), UV aging (L), and composite aging (U) treatments increased the proportion of bioavailable-Cd, and all aging treatments facilitated the conversion of potentially bioavailable-Cd to non-bioavailable-Cd. The application of NBC and five aged NBCs reduced the proportion of bioavailable-Cd in the soil through precipitation and complexation, increasing the proportion of non-bioavailable-Cd. Aging modifies the physicochemical properties of NBC, thus influencing soil characteristics and ultimately diminishing NBC's ability to passivate Cd in the soil. This study provides reference for the long-term application of biochar in heavy metal-contaminated environments.
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Affiliation(s)
- Yifan Wang
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Jianen Li
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Qiaona Li
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Liang Xu
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Yunhe Ai
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Wei Liu
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Yutong Zhou
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Boyu Zhang
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Nan Guo
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Bo Cao
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Jianhua Qu
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Ying Zhang
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China.
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Fan J, Liao M, Duan T, Hu Y, Sun J. The Mechanism of Arsenic Release in Contaminated Paddy Soil with Added Biochar: The Role of Dissolved Organic Matter, Fe, and Bacteria. TOXICS 2024; 12:661. [PMID: 39330589 PMCID: PMC11435835 DOI: 10.3390/toxics12090661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2024] [Revised: 09/03/2024] [Accepted: 09/06/2024] [Indexed: 09/28/2024]
Abstract
The addition of biochar inevitably modifies the acidity (pH), redox potential (Eh), and dissolved organic matter (DOM) level in the soil. These alterations also have coupled effects on the cycling of iron (Fe) and the composition of bacterial communities, thereby impacting the speciation and availability of arsenic (As) in the soil. This study explored the potential mechanisms through which biochar affects As in paddy soil during flooded cultivation with different pyrolysis temperature biochars (300 °C, 400 °C, and 500 °C) added. The results revealed that the TAs concentration increased in the initial 15 days of soil cultivation with SBC300 or SBC400 addition because increasing the concentration of DOM induced the mobility of As though the formation of As-DOM complexes. Meanwhile, biochar addition elevated the pH, decreased the Eh, and promoted the transformation of specific adsorbed As (A-As) and amorphous iron oxide-bound As (Amo-Fe-As) to supernatant As through enhancing the reductive dissolution of Fe(oxy)(hydr)oxides. Moreover, the biochar altered the relative abundance of As (V)-reducing bacteria (such as Firmicutes) and As (III)-oxidizing bacteria (such as Chloroflex), thereby affecting As speciation. However, these mechanistic effects varied depending on the pyrolysis temperature of the biochar. The microbial composition of SBC300 and SBC400 were similar, with both containing larger populations of Enterobacteriaceae (AsRB) and pseudomonas (FeRB) compared to CK and SBC500. It was proposed that lower pyrolysis temperatures (300 °C and 400 °C) are more favorable for the dissolution of Fe(oxy)(hydr)oxides and the reduction of As (V). However, the biochar from the higher pyrolysis temperature (500 °C) showed environmental impacts akin to the control group (CK). This study demonstrated potential mechanisms of biochar's effect on As and the role of pyrolysis temperature.
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Affiliation(s)
- Jianxin Fan
- Chongqing Engineering Laboratory of Environmental Hydraulic Engineering, Chongqing Jiaotong University, Chongqing 400074, China
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; (M.L.); (T.D.); (Y.H.); (J.S.)
| | - Maoyu Liao
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; (M.L.); (T.D.); (Y.H.); (J.S.)
| | - Ting Duan
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; (M.L.); (T.D.); (Y.H.); (J.S.)
| | - Ying Hu
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; (M.L.); (T.D.); (Y.H.); (J.S.)
| | - Jiaoxia Sun
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; (M.L.); (T.D.); (Y.H.); (J.S.)
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Li X, Li T, Jeyakumar P, Li J, Bao Y, Jin X, Zhang J, Guo C, Jiang X, Lu G, Dang Z, Wang H. Effect of biochar-derived DOM on contrasting redistribution of chromate during Schwertmannite dissolution and recrystallization. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:134988. [PMID: 38908178 DOI: 10.1016/j.jhazmat.2024.134988] [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: 03/27/2024] [Revised: 06/13/2024] [Accepted: 06/19/2024] [Indexed: 06/24/2024]
Abstract
Biochar-derived dissolved organic matter (BDOM), is extensively involved in the recrystallization of minerals and the speciation alteration of associated toxic metals. This study investigates how BDOM extracted from tobacco petiole (TP) or tobacco stalk (TS) biochar influences the speciation repartitioning of Cr(VI) in environments impacted by acid mine drainage (AMD), focusing on interactions with secondary minerals during Schwertmannite (Sch) dissolution and recrystallization. TP-BDOM, rich in lignin-like substances, slowed down the Cr-Sch dissolution and Cr release under acidic conditions compared to TS-BDOM. TP-BDOM's higher O/C component exerts a delayed impact on Cr-Sch stability and Cr(VI) reduction. In-situ ATR-FTIR and 2D-COS analysis showed that carboxylic and aromatic N-OH groups in BDOM could interact with Cr-Sch surfaces, affecting sulfate and Cr(VI) release. It was also observed that slight recrystallization occurred from Cr-Sch to goethite, along with increased Cr incorporation into secondary minerals within TS-BDOM. This enhances our understanding of BDOM's role in Cr(VI) speciation changes in AMD-contaminated sites.
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Affiliation(s)
- Xiaofei Li
- School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China
| | - Tianfu Li
- School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China
| | - Paramsothy Jeyakumar
- Environmental Sciences Group, School of Agriculture and Environment, Massey University, Palmerston North 4442, New Zealand
| | - Jiayi Li
- School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China; Agronomy College, Shenyang Agricultural University, Shenyang 110866, PR China
| | - Yanping Bao
- School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China
| | - Xiaohu Jin
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Jun Zhang
- School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China; Agronomy College, Shenyang Agricultural University, Shenyang 110866, PR China
| | - Chuling Guo
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Xueding Jiang
- School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China
| | - Guining Lu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Hailong Wang
- School of Environmental and Chemical Engineering, Foshan University, Foshan 528000, PR China; Guangdong Provincial Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, PR China.
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Chen W, Yu S, Zhang H, Wei R, Ni J, Farooq U, Qi Z. Biochar-derived organic carbon promoting the dehydrochlorination of 1,1,2,2-tetrachloroethane and its molecular size effects: Synergies of dipole-dipole and conjugate bases. WATER RESEARCH 2024; 259:121812. [PMID: 38810344 DOI: 10.1016/j.watres.2024.121812] [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: 01/27/2024] [Revised: 05/16/2024] [Accepted: 05/19/2024] [Indexed: 05/31/2024]
Abstract
The environmental effects of biochar-derived organic carbon (BDOC) have attracted increasing attention. Nevertheless, it is unknown how BDOC might affect the natural attenuation of widely distributed chloroalkanes (e.g., 1,1,2,2-tetrachloroethane (TeCA)) in aqueous environments. We firstly observed that the kinetic constants (ke) of TeCA dehydrochlorination in the presence of BDOC samples or their different molecular size fractions (<1 kDa, 1∼10 kDa, and >10 kDa) ranged from 9.16×103 to 26.63×103 M-1h-1, which was significantly greater than the ke (3.53×103 M-1h-1) of TeCA dehydrochlorination in the aqueous solution at pH 8.0, indicating that BDOC samples and their different molecular size fractions all could promote TeCA dehydrochlorination. For a given BDOC sample, the kinetic constants (ke) of TeCA dehydrochlorination in the initial pH 9.0 solution was 2∼3 times greater than that in the initial pH 8.0 solution due to more formation of conjugate bases. Interestingly, their DOC concentration normalized kinetic constants (ke/[DOC]) were negatively correlated with SUVA254, and positively correlated with A220/A254 and the abundance of aromatic protein-like/polyphenol-like matters. A novel mechanism was proposed that the CH dipole of BDOC aliphatic structure first bound with the CCl dipole of TeCA to capture the TeCA molecule, then the conjugate bases (-NH-/-NH2 and deprotonated phenol-OH of BDOC) could attack the H atom attached to the β-C atom of bound TeCA, causing a CCl bond breaking and the trichloroethylene formation. Furthermore, a fraction of >1 kDa had significantly greater ke/[DOC] values of TeCA dehydrochlorination than the fraction of <1 kDa because >1 kDa fraction had higher aliphiticity (more dipole-dipole sites) as well as more N-containing species and aromatic protein-like/polyphenol-like matters (more conjugate bases). The results are helpful for profoundly understanding the BDOC-mediated natural attenuation and fate change of chloroalkanes in the environment.
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Affiliation(s)
- Weifeng Chen
- Institute of Geography, Ministry of Education Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian 350007, China.
| | - Shuhan Yu
- Institute of Geography, Ministry of Education Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Huiying Zhang
- Institute of Geography, Ministry of Education Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Ran Wei
- Institute of Geography, Ministry of Education Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Jinzhi Ni
- Institute of Geography, Ministry of Education Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Usman Farooq
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, China
| | - Zhichong Qi
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, China.
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Huang Q, Chen W, Gao J, Meng F, Cai Y, Wang Y, Yuan G. Impact of low molecular weight organic acids on heavy metal(loid) desorption in biochar-amended paddy soil. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2024; 46:289. [PMID: 38970698 DOI: 10.1007/s10653-024-02064-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 06/04/2024] [Indexed: 07/08/2024]
Abstract
Low molecular weight organic acids (LMWOAs) are important soil components and play a key role in regulating the geochemical behavior of heavy metal(loid)s. Biochar (BC) is a commonly used amendment that could change LMWOAs in soil. Here, four LMWOAs of oxalic acid (OA), tartaric acid (TA), malic acid (MA), and citric acid (CA) were evaluated for their roles in changing Cd and SB desorption behavior in contaminated soil with (S1-BC) or without BC (S1) produced from Paulownia biowaste. The results showed that OA, TA, MA, and CA reduced soil pH with rising concentrations, and biochar partially offset the pH reduction by LMWOAs. The LMWOAs reduced Cd desorption from the soil at low concentrations but increased Cd desorption at high concentrations, and CA was the most powerful in this regard. The LMWOAs had a similar effect on Sb desorption, and CA was the most effective species of LMWOAs. Adding BC to the soil affects Cd and Sb dynamics by reducing the Cd desorption but increasing Sb desorption from the soil and increasing the distribution coefficient (Kd) values of Cd but lowering the Kd values of Sb. This study helped understand the effects of LMWOAs on the geochemical behavior of Cd and Sb in the presence of biochar, as well as the potential risks of biochar amendment in enhancing Sb desorption from contaminated soil.
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Affiliation(s)
- Qiuxiang Huang
- College of Resource and Environment, Anhui Science and Technology University, Chuzhou, 233100, Anhui, China
| | - Wenzhe Chen
- College of Resource and Environment, Anhui Science and Technology University, Chuzhou, 233100, Anhui, China
| | - Jinyan Gao
- College of Resource and Environment, Anhui Science and Technology University, Chuzhou, 233100, Anhui, China
| | - Fande Meng
- College of Resource and Environment, Anhui Science and Technology University, Chuzhou, 233100, Anhui, China.
- Anhui Province Agricultural Waste Fertilizer Utilization and Cultivated Land Quality Improvement Engineering Research Center, Chuzhou, 233100, China.
| | - Yongbing Cai
- College of Resource and Environment, Anhui Science and Technology University, Chuzhou, 233100, Anhui, China
- Anhui Province Agricultural Waste Fertilizer Utilization and Cultivated Land Quality Improvement Engineering Research Center, Chuzhou, 233100, China
| | - Yan Wang
- College of Resource and Environment, Anhui Science and Technology University, Chuzhou, 233100, Anhui, China
- Anhui Province Agricultural Waste Fertilizer Utilization and Cultivated Land Quality Improvement Engineering Research Center, Chuzhou, 233100, China
| | - Guodong Yuan
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, Guangdong Technology and Equipment Research Center for Soil and Water Pollution Control, Zhaoqing University, Zhaoqing, 526061, Guangdong, China.
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Ning X, Long S, Liu Z, Dong Y, He L, Wang S. Vertical distribution of arsenic and bacterial communities in calcareous farmland amending by organic fertilizer and iron-oxidizing bacteria: Field experiment on concomitant remediation. JOURNAL OF HAZARDOUS MATERIALS 2024; 471:134415. [PMID: 38677113 DOI: 10.1016/j.jhazmat.2024.134415] [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: 01/10/2024] [Revised: 04/09/2024] [Accepted: 04/23/2024] [Indexed: 04/29/2024]
Abstract
The migration and transformation mechanisms of arsenic (As) in soil environments necessitate an understanding of its influencing processes. Here, we investigate the subsurface biogeochemical transformation of As and iron (Fe) through amended in the top 20 cm with iron oxidizing bacteria (FeOB) and organic fertilizer (OF). Our comprehensive 400-day field study, conducted in a calcareous soil profile sectioned into 20 cm increments, involved analysis by sequential extraction and assessment of microbial properties. The results reveal that the introduction of additional OF increased the release ratio of As/Fe from the non-specific adsorption fraction (136.47 %) at the subsoil depth (40-60 cm), underscoring the importance of sampling at various depths and time points to accurately elucidate the form, instability, and migration of As within the profile. Examination of bacterial interaction networks indicated a disrupted initial niche in the bottom layer, resulting in a novel cooperative symbiosis. While the addition of FeOB did not lead to the dominance of specific bacterial species, it did enhance the relative abundance of As-tolerant Acidobacteria and Gemmatimonadetes in both surface (39.2 % and 38.76 %) and deeper soils (44.29 % and 23.73 %) compared to the control. Consequently, the amendment of FeOB in conjunction with OF facilitated the formation of poorly amorphous Fe (hydr)oxides in the soil, achieved through abiotic and biotic sequestration processes. Throughout the long-term remediation process, the migration coefficient of bioavailable As within the soil profile decreased, indicating that these practices did not exacerbate As mobilization. This study carries significant implications for enhancing biogeochemical cycling in As-contaminated Sierozem soils and exploring potential bioremediation strategies. ENVIRONMENTAL IMPLICATION: The long-term exposure of sewage irrigation has potential adverse effects on the local ecosystem, causing serious environmental problems. Microorganisms play a vital role in the migration and transformation of arsenic in calcareous soil in arid areas, which highlights the necessity of understanding its dynamics. The vertical distribution, microbial community and fate of arsenic in calcareous farmland soil profile in northwest China were studied through field experiments. The results of this work have certain significance for the remediation of arsenic-contaminated soil in arid areas, and provide new insights for the migration, transformation and remediation of arsenic in this kind of soil.
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Affiliation(s)
- Xiang Ning
- Technoloy Research Center for Pollution Control and Remediation of Northwest Soil and Groundwater, College of Earth and Environmental Sciences, Lanzhou University, China.
| | - Song Long
- Technoloy Research Center for Pollution Control and Remediation of Northwest Soil and Groundwater, College of Earth and Environmental Sciences, Lanzhou University, China
| | - Zitong Liu
- Technoloy Research Center for Pollution Control and Remediation of Northwest Soil and Groundwater, College of Earth and Environmental Sciences, Lanzhou University, China
| | - Yinwen Dong
- Technoloy Research Center for Pollution Control and Remediation of Northwest Soil and Groundwater, College of Earth and Environmental Sciences, Lanzhou University, China
| | - Liang He
- Technoloy Research Center for Pollution Control and Remediation of Northwest Soil and Groundwater, College of Earth and Environmental Sciences, Lanzhou University, China
| | - Shengli Wang
- Technoloy Research Center for Pollution Control and Remediation of Northwest Soil and Groundwater, College of Earth and Environmental Sciences, Lanzhou University, China.
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10
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Wu J, Fu X, Zhao L, Lv J, Lv S, Shang J, Lv J, Du S, Guo H, Ma F. Biochar as a partner of plants and beneficial microorganisms to assist in-situ bioremediation of heavy metal contaminated soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 923:171442. [PMID: 38453085 DOI: 10.1016/j.scitotenv.2024.171442] [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: 12/28/2023] [Revised: 02/19/2024] [Accepted: 03/01/2024] [Indexed: 03/09/2024]
Abstract
Synergistic remediation of heavy metal (HM) contaminated soil using beneficial microorganisms (BM) and plants is a common and effective in situ bioremediation method. However, the shortcomings of this approach are the low colonisation of BM under high levels of heavy metal stress (HMS) and the poor state of plant growth. Previous studies have overlooked the potential of biochar to mitigate the above problems and aid in-situ remediation. Therefore, this paper describes the characteristics and physicochemical properties of biochar. It is proposed that biochar enhances plant resistance to HMS and aids in situ bioremediation by increasing colonisation of BM and HM stability. On this basis, the paper focuses on the following possible mechanisms: specific biochar-derived organic matter regulates the transport of HMs in plants and promotes mycorrhizal colonisation via the abscisic acid signalling pathway and the karrikin signalling pathway; promotes the growth-promoting pathway of indole-3-acetic acid and increases expression of the nodule-initiating gene NIN; improvement of soil HM stability by ion exchange, electrostatic adsorption, redox and complex precipitation mechanisms. And this paper summarizes guidelines on how to use biochar-assisted remediation based on current research for reference. Finally, the paper identifies research gaps in biochar in the direction of promoting beneficial microbial symbiotic mechanisms, recognition and function of organic molecules, and factors affecting practical applications.
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Affiliation(s)
- Jieting Wu
- School of Environmental Science, Liaoning University, Shenyang 110036, China.
| | - Xiaofan Fu
- School of Environmental Science, Liaoning University, Shenyang 110036, China
| | - Lei Zhao
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jin Lv
- School of Environmental Science, Liaoning University, Shenyang 110036, China
| | - Sidi Lv
- School of Environmental Science, Liaoning University, Shenyang 110036, China
| | - Jing Shang
- School of Environmental Science, Liaoning University, Shenyang 110036, China
| | - Jiaxuan Lv
- School of Environmental Science, Liaoning University, Shenyang 110036, China
| | - Shuxuan Du
- School of Environmental Science, Liaoning University, Shenyang 110036, China
| | - Haijuan Guo
- School of Environmental Science, Liaoning University, Shenyang 110036, China.
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
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11
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Wang W, Nie M, Yan C, Yuan Y, Xu A, Ding M, Wang P, Ju M. Effect of pyrolysis temperature and molecular weight on characterization of biochar derived dissolved organic matter from invasive plant and binding behavior with the selected pharmaceuticals. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 348:123867. [PMID: 38556151 DOI: 10.1016/j.envpol.2024.123867] [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: 12/13/2023] [Revised: 03/20/2024] [Accepted: 03/24/2024] [Indexed: 04/02/2024]
Abstract
A comprehensive understanding of the characteristics of biochar released-dissolved organic matter (BDOM) derived from an invasive plant and its impact on the binding behavior of pharmaceuticals is essential for the application of biochar, yet has received less attention. In this study, the binding behavior of BDOM pyrolyzed at 300-700 °C with sulfathiazole, acetaminophen, chloramphenicol (CAP), and carbamazepine (CMZ) was investigated based on a multi-analytical approach. Generally, the pyrolysis temperature exhibited a more significant impact on the spectral properties of BDOM and pharmaceutical binding behavior than those of the molecular weight. With increased pyrolysis temperature, the dissolved organic carbon decreased while the proportion of the protein-like substance increased. The highest binding capacity towards the drugs was observed for the BDOM pyrolyzed at 500 °C with the molecular weight larger than 0.3 kDa. Moreover, the protein-like substance exhibited higher susceptive and released preferentially during the dialysis process and also showed more sensitivity and bound precedingly with the pharmaceuticals. The active binding points were the aliphatic C-OH, amide II N-H, carboxyl CO, and phenolic-OH on the tryptophan-like substance. Furthermore, the binding affinity of the BDOM pyrolyzed at 500 °C was relatively high with the stability constant (logKM) of 4.51 ± 0.52.
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Affiliation(s)
- Wangyu Wang
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang, 330022, China
| | - Minghua Nie
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang, 330022, China
| | - Caixia Yan
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang, 330022, China.
| | - Yulong Yuan
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang, 330022, China
| | - Aoxue Xu
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang, 330022, China
| | - Mingjun Ding
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang, 330022, China
| | - Peng Wang
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang, 330022, China
| | - Min Ju
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang, 330022, China
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12
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Zhang Y, Xiao Q, Wu W, Zhang X, Xu X, Yang S. Comparison of water-soluble organic matter (WSOM)-containing and WSOM-free biochars for simultaneous sorption of lead and cadmium. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 921:171159. [PMID: 38387580 DOI: 10.1016/j.scitotenv.2024.171159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 02/17/2024] [Accepted: 02/19/2024] [Indexed: 02/24/2024]
Abstract
The effects of individual biochar constituents and natural environmental media on the immobilization behaviors and chemical activities of toxic heavy metals are still poorly understood. In this work, the physicochemical properties of raw corn straw (CS) and CS-derived biochar materials as well as their sorption abilities and retention mechanisms for lead (Pb) and cadmium (Cd) were evaluated by combining batch experiments and spectral approaches. According to the spectral analysis results and single variable principle, the setting of biochars after soaking in solution as the control group was suggested when evaluating their retention mechanisms for Pb and Cd. The rising of ionic strength did not apparently affect the immobilization of Pb by biochar prepared at 500 °C (i.e., CB500) and Pb/Cd by water-soluble organic matter (WSOM)-free CB500 (i.e., DCB500), while slightly inhibited the sorption of Cd by CB500. Pb and Cd exhibited a mutual inhibition effect on their sorption trends with a higher sorption preference of Pb. The dominant fixation mechanism of Pb by CB500 and DCB500 was identified to be mineral precipitation. In contrast, the main sorption mechanism of Cd changed from mineral precipitation in the single-metal system to surface complexation in the binary-metal system. The sorption ratios of Pb and Cd on CB500 were comparable to those on DCB500 with the coexistence of mixed natural organic matters (NOM) and ferrihydrite. The current experimental findings suggested that DCB500 was a suitable remediation agent for regulating the migration behaviors of toxic Pb and Cd in acidic and NOM-rich soil and water systems.
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Affiliation(s)
- Yu Zhang
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
| | - Qi Xiao
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
| | - Wenyu Wu
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
| | - Xuening Zhang
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
| | - Xinghua Xu
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China
| | - Shitong Yang
- School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China.
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13
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Huang S, Chen M, Lu H, Eitssayeam S, Min Y, Shi P. Effect of pyrolysis temperature on the binding characteristics of DOM derived from livestock manure biochar with Cu(II). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:24250-24262. [PMID: 38436847 DOI: 10.1007/s11356-024-32646-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 02/21/2024] [Indexed: 03/05/2024]
Abstract
Biochar-derived dissolved organic matter (BDOM) has the potential to influence the environmental application of biochar and the behavior of heavy metals. In this study, the binding properties of BDOM derived from livestock manure biochar at different pyrolysis temperatures with Cu(II) were investigated based on a multi-analytical approach. The results showed that the DOC concentration, aromatics, and humification degree of BDOM were higher in the process of low pyrolysis of biochar. The pyrolysis temperature changed the composition of BDOM functional groups, which affected the binding mechanism of BDOM-Cu(II). Briefly, humic-like and protein-like substances dominated BDOM-Cu(II) binding at low and high pyrolysis temperatures, respectively. The higher binding capacity for Cu(II) was exhibited by BDOM derived from the lower pyrolysis temperature, due to the carboxyl as the main binding site in humic acid had high content and binding ability at low-temperature. The amide in proteins only participated in the BDOM-Cu(II) binding at high pyrolysis temperature, and polysaccharides also played an important role in the binding process. Moreover, the biochar underwent the secondary reaction at certain high temperatures, which led to condensation reaction of the aromatic structure and the conversion of large molecules into small molecules, affecting the BDOM-Cu(II) binding sites.
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Affiliation(s)
- Shujun Huang
- Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China
| | - Muxin Chen
- Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China
| | - Hongxiu Lu
- Department of Biomedicine and Health, Shanghai Vocational College of Agriculture and Forestry, Shanghai, 201699, People's Republic of China
| | - Sukum Eitssayeam
- Physics and Materials Science Department, Faculty of Science, Chiang Mai University, 239 Huay Kaew Road, Muang District, Chiang Mai, 50200, Thailand
| | - Yulin Min
- Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200090, People's Republic of China
| | - Penghui Shi
- Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai, 200090, People's Republic of China.
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200090, People's Republic of China.
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14
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Chen X, Jiang S, Wu J, Yi X, Dai G, Shu Y. Three-year field experiments revealed the immobilization effect of natural aging biochar on typical heavy metals (Pb, Cu, Cd). THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169384. [PMID: 38104846 DOI: 10.1016/j.scitotenv.2023.169384] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/21/2023] [Accepted: 12/12/2023] [Indexed: 12/19/2023]
Abstract
Biochar has been widely used for the remediation of heavy metal contaminated soil, while the long-term field aging on its properties and the performance in the ability of metal immobilization must not be overlooked. In this study, the stability of immobilized heavy metals (Cd, Cu, Pb) on biochar during a 3-year remediation for soil in the field was investigated through desorption experiments. The results indicated that the application of biochar and its aging in the field both remarkably increased the immobilization of the 3 metal ions in the field under 3-year remediation. The cumulative desorption of the 3 metals decreased with biochar aging, and the desorption rate of Pb2+, Cu2+ and Cd2+ in T3 (Application of 30 t·hm-2 of biochar) for the third year was 0.08 %, 0.20 % and 13.15 %. Meanwhile, both the desorption rates and extents exhibited significant difference with the order of Pb2+ < Cu2+ < Cd2+. The increased soil pH, the enhancement of O/C ratio (Increase from 0.30 for fresh BC to 0.61 for aged BC(S3)) and oxygen-containing functional groups in biochar, and the accretion of organo-mineral micro-agglomerates on biochar surfaces and in pores during field aging process jointly contributed the immobilization of metals in soils mainly through co-precipitation and complexation. Our results provide new insights into the practical application of biochar in soils contaminated with multiple heavy metals from the perspective of long-term effects, which suggests that the potential release risk of metals become slighter over time.
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Affiliation(s)
- Xukai Chen
- School of Environment, South China Normal University, Guangzhou 510006, People's Republic of China
| | - Shaojun Jiang
- School of Environment, South China Normal University, Guangzhou 510006, People's Republic of China; Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, People's Republic of China
| | - Junchang Wu
- School of Environment, South China Normal University, Guangzhou 510006, People's Republic of China
| | - Xing Yi
- School of Environment, South China Normal University, Guangzhou 510006, People's Republic of China
| | - Guangling Dai
- School of Environment, South China Normal University, Guangzhou 510006, People's Republic of China
| | - Yuehong Shu
- School of Environment, South China Normal University, Guangzhou 510006, People's Republic of China.
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15
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Ge M, Wang B, Chen B, Xie H, Sun H, Sun K, Feng Y. Hydrochar and Its Dissolved Organic Matter Aged in a 30-Month Rice-Wheat Rotation System: Do Primary Aging Factors Alter at Different Stages? ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:3019-3030. [PMID: 38308619 DOI: 10.1021/acs.est.3c08044] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2024]
Abstract
Hydrochar, recognized as a green and sustainable soil amendment, has garnered significant attention. However, information on the aging process in soil and the temporal variability of hydrochar remains limited. This study delves deeper into the interaction between hydrochar and soil, focusing on primary factors influencing hydrochar aging during a 30-month rice-wheat rotation system. The results showed that the initial aging of hydrochar (0-16 months) is accompanied by the development of specific surface area and leaching of hydrochar-derived dissolved organic matter (HDOM), resulting in a smaller particle size and reduced carbon content. The initial aging also features a mineral shield, while the later aging (16 to 30 months) involves surface oxidation. These processes collectively alter the surface charge, hydrophilicity, and composition of aged hydrochar. Furthermore, this study reveals a dynamic interaction between the HDOM and DOM derived from soil, plants, and microbes at different aging stages. Initially, there is a preference for decomposing labile carbon, whereas later stages involve the formation of components with higher aromaticity and molecular weight. These insights are crucial for understanding the soil aging effects on hydrochar and HDOM as well as evaluating the interfacial behavior of hydrochar as a sustainable soil amendment.
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Affiliation(s)
- Mengting Ge
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Bingyu Wang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Bingfa Chen
- Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Huifang Xie
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Haijun Sun
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
| | - Ke Sun
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Yanfang Feng
- Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
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16
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Wang Y, Wang K, Wang X, Zhao Q, Jiang J, Jiang M. Effect of different production methods on physicochemical properties and adsorption capacities of biochar from sewage sludge and kitchen waste: Mechanism and correlation analysis. JOURNAL OF HAZARDOUS MATERIALS 2024; 461:132690. [PMID: 37801977 DOI: 10.1016/j.jhazmat.2023.132690] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 09/25/2023] [Accepted: 09/30/2023] [Indexed: 10/08/2023]
Abstract
Different pyrolysis methods, parameters and feedstocks result in biochars with different properties, structures and removal capacities for heavy metals. However, the role of each property on adsorption capacity and corresponding causal relationships remain unclear. Here, we investigated various physicochemical properties of biochar produced via three different methods and two different feedstocks to clarify influences of biomass sources and pyrolysis processes on biochar properties and its heavy metal adsorption performance. Experimental results showed biochars were more aromatic and contained more functional groups after hydrothermal carbonization, while they had developed pores and higher surface areas produced by anaerobic pyrolysis. The inclusion of oxygen resulted in more complete carbonization and higher CEC biochar. Different biochar properties resulted in different adsorption capacities. Biochar produced by aerobic calcination showed higher adsorption efficiency for Cu and Pb. Correlation analysis proved that pH, cation exchange capacity and degree of carbonization positively affected adsorption, while organic matter content and aromaticity were unfavorable for adsorption. Microstructure and components determined biochar macroscopic properties and ultimate adsorption efficiency for metal ions. This study identifies the degree of correlation and pathways of each property on adsorption, which provides guidance for targeted modification of biochar to enhance its performance in heavy metal removal.
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Affiliation(s)
- Yipeng Wang
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Kun Wang
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Xuchan Wang
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Qingliang Zhao
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Junqiu Jiang
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Miao Jiang
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
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17
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Fan J, Duan T, Zou L, Sun J. Characteristics of dissolved organic matter composition in biochar: Effects of feedstocks and pyrolysis temperatures. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:85139-85153. [PMID: 37380857 DOI: 10.1007/s11356-023-28431-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 06/21/2023] [Indexed: 06/30/2023]
Abstract
Biochar has widely used in soil pollution remediation due to its advantages of high efficiency and environmental sustainability. Dissolved organic matter (DOM) released by biochar plays a non-negligible role in the migration and transformation of pollutants in environment, and its composition was regarded as main impact factor. In this study, 28 biochar were investigated to detect the effect of pyrolysis temperature and feedstock on DOM content and components. Results showed that the content of DOM released from biochar at low pyrolysis temperatures (300-400 ℃) was higher than that from high pyrolysis temperatures (500-600 ℃). In addition, the specific UV-Visible absorbance at 254 nm (SUVA254) results expressed that DOM from peanut shell biochar (PSBC), rice husk biochar (RHBC) and bamboo biochar (BBC) had higher humification at high temperatures. Moreover, one fulvic acid-like (C2) and two humic acid-like (C1, C3) substances were main fluorescent components of biochar-derived DOM identified by parallel factor analysis based on excitation emission matrices fluorescence spectroscopies (EEM-PARAFAC). With the increase of pyrolysis temperature, humic acid substances content gradually decreased. The correlation analysis results revealed that pyrolysis temperatures and O/C, H/C, DOM content, the biological index (BIX), humification index (HIX), C1% and C3% was negatively correlated (p < 0.001). Thus, the pyrolysis temperatures take important roles in composition of DOM released from biochar, and this research would provide a reference for the application of biochar in the environment.
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Affiliation(s)
- Jianxin Fan
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China.
| | - Ting Duan
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Lan Zou
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Jiaoxia Sun
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
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18
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Chen J, Zhang H, Farooq U, Zhang Q, Ni J, Miao R, Chen W, Qi Z. Transport of dissolved organic matters derived from biomass-pyrogenic smoke (SDOMs) and their effects on mobility of heavy metal ions in saturated porous media. CHEMOSPHERE 2023; 336:139247. [PMID: 37330067 DOI: 10.1016/j.chemosphere.2023.139247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 06/14/2023] [Accepted: 06/15/2023] [Indexed: 06/19/2023]
Abstract
Biomass-pyrogenic smoke-derived dissolved organic matter (SDOMs) percolating into the underground environment profoundly impacts the transport and fate of environmental pollutants in groundwater systems. Herein, SDOMs were produced by pyrolyzing wheat straw at 300-900 °C to explore their transport properties and effects on Cu2+ mobility in quartz sand porous media. The results indicated that SDOMs exhibited high mobility in saturated sand. Meanwhile, the mobility of SDOMs was enhanced at a higher pyrolysis temperature due to the decrease in their molecular sizes and the declined H-bonding interactions between SDOM molecules and sand grains. Furthermore, the transport of SDOMs was elevated as pH values were raised from 5.0 to 9.0, which resulted from the strengthened electrostatic repulsion between SDOMs and quartz sand particles. More importantly, SDOMs could facilitate Cu2+ transport in the quartz sand, which stemmed from forming soluble Cu-SDOM complexes. Intriguingly, the promotional function of SDOMs for the mobility of Cu2+ was strongly dependent on the pyrolysis temperature. Generally, SDOMs generated at higher temperatures exhibited superior effects. The phenomenon was mainly due to the differences in the Cu-binding capacities of various SDOMs (e.g., cation-π attractive interactions). Our findings highlight that the high-mobility SDOM can considerably affect heavy metal ions' environmental fate and transport.
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Affiliation(s)
- Jiuyan Chen
- Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian, 350007, China; Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng, 475004, China
| | - Huiying Zhang
- Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian, 350007, China
| | - Usman Farooq
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng, 475004, China
| | - Qiang Zhang
- Ecology Institute of the Shandong Academy of Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China
| | - Jinzhi Ni
- Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian, 350007, China
| | - Renhui Miao
- Dabieshan National Observation and Research Field Station of Forest Ecosystem at Henan, International Joint Research Laboratory for Global Change Ecology, School of Life Sciences, Henan University, Kaifeng, 475004, China
| | - Weifeng Chen
- Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Provincial Key Laboratory for Plant Eco-physiology, School of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian, 350007, China.
| | - Zhichong Qi
- Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng, 475004, China.
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19
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Jin L, Wei D, Li Y, Zou G, Wang L, Ding J, Zhang Y, Sun L, Wang W, Ma X, Shen H, Wang Y, Wang J, Lu X, Sun Y, Ding X, Li D, Yin D. Effects of Biochar on the Fluorescence Spectra of Water-Soluble Organic Matter in Black Soil Profile after Application for Six Years. PLANTS (BASEL, SWITZERLAND) 2023; 12:831. [PMID: 36840177 PMCID: PMC9965516 DOI: 10.3390/plants12040831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/04/2023] [Accepted: 02/09/2023] [Indexed: 06/18/2023]
Abstract
At present, extracting water-soluble organic matter (WSOM) from agricultural organic waste is primarily used to evaluate soil organic matter content in farmland. However, only a few studies have focused on its vertical behavior in the soil profile. This study aims to clarify the three-dimensional fluorescence spectrum characteristics of the WSOM samples in 0-60 cm black soil profile before and after different chemical fertilizer treatments after six years of fertilization. Fluorescence spectroscopy combined with fluorescence and ultraviolet-visible (UV-Vis) spectroscopies are used to divide four different fertilization types: no fertilization (T0), nitrogen phosphorus potassium (NPK) (T1), biochar (T2), biochar + NPK (T3), and biochar + N (T4) in a typical black soil area. The vertical characteristics of WSOC are also analyzed. The results showed that after six years of nitrogen application, T2 had a significant effect on the fluorescence intensity of Zone II (decreasing by 9.6% in the 0-20 cm soil layer) and Zone V (increasing by 8.5% in the 0-20 cm soil layer). The fluorescent components identified in each treatment group include ultraviolet radiation A humic acid-like substances (C1), ultraviolet radiation C humic acid-like substances (C2), and tryptophan-like substance (C3). As compared with the land with T1, the content of C2 in the 20-60 cm soil layer with T2 was lower, while that of C2 in the surface and subsoil with T3 was higher. In addiiton, there were no significant differences in the contents of C1, C2, and C3 by comparing the soils applied with T3 and T4, respectively. The composition of soil WSOM was found to be significantly influenced by the addition of a mixture of biochar and chemical fertilizers. The addition of biochar alone exerted a positive effect on the humification process in the surface soil (0-10 cm). NPK treatment could stimulate biological activity by increasing biological index values in deeper soil layers (40-50 cm). Nitrogen is the sovereign factor that improves the synergism effect of chemical fertilizer and biochar during the humification process. According to the UV-Vis spectrum and optical index, soil WSOM originates from land and microorganisms. This study reveals the dynamics of WSOC in the 0-60 cm soil layer and the biogeochemical effect of BC fertilizer treatment on the agricultural soil ecosystem.
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Affiliation(s)
- Liang Jin
- Plant Nutrition and Resources Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Dan Wei
- Plant Nutrition and Resources Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Yan Li
- Plant Nutrition and Resources Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Guoyuan Zou
- Plant Nutrition and Resources Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Lei Wang
- Plant Nutrition and Resources Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Jianli Ding
- Plant Nutrition and Resources Institute, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Yitao Zhang
- Institute of Geographic Sciences and Natural Resources Research, Beijing 100101, China
| | - Lei Sun
- Heilongjiang Institute of Black Soil Protection and Utilization, Harbin 150086, China
| | - Wei Wang
- Heilongjiang Institute of Black Soil Protection and Utilization, Harbin 150086, China
| | - Xingzhu Ma
- Heilongjiang Institute of Black Soil Protection and Utilization, Harbin 150086, China
| | - Huibo Shen
- Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar 161005, China
| | - Yuxian Wang
- Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar 161005, China
| | - Junqiang Wang
- Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar 161005, China
| | - Xinrui Lu
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China
| | - Yu Sun
- Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin 150027, China
| | - Xinying Ding
- Institute of Animal Husbandry and Veterinary of Heilongjiang Academy of Agricultural Sciences, Qiqihar 161005, China
| | - Dahao Li
- Qiqihar Agricultural Technology Promotion Center, Qiqihar 161000, China
| | - Dawei Yin
- College of Agricultural Science and Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, China
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20
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Liang Y, Li X, Yang F, Liu S. Tracing the synergistic migration of biochar and heavy metals based on 13C isotope signature technique: Effect of ionic strength and flow rate. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 859:160229. [PMID: 36402328 DOI: 10.1016/j.scitotenv.2022.160229] [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: 09/05/2022] [Revised: 11/01/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
Understanding the transport of biochar and heavy metals is important for evaluation of the long-term stability and ecotoxicity of heavy metals after biochar remediation. In this study, 13C-labelled biochar was prepared to investigate the synergistic down migration of biochar and heavy metals in the soil profile, and the effect of ionic strength (IS) and flow rate was examined. Results showed that the 13C-labelled biochar with high δ13C (249.3 ‰) was suitable for tracing the migration of biochar without influencing its adsorption for heavy metals (i.e., Cu2+ and Cd2+). Both higher IS and flow rate were favorable for the release of biochar, but higher IS inhibited the transport of biochar in soil profile, which was attributed to the enhanced primary- and secondary-minimum deposition based on the Derjaguin-Landau-Verwey-Overbeek (DLVO) analysis. The transport of Cu2+ and Cd2+ was facilitated by high IS and flow rate. The release of Cd from biochar was mainly affected by IS, due to ion exchange and a weaker electrostatic attraction to biochar at higher IS, while that of Cu was mainly affected by flow rate related to co-migration of metal with biochar. Metal-biochar particle was the dominant form to migrate in upper soil layer, whereas, soluble Cd2+ and Cu2+ desorbed from biochar were the dominant forms that migrated to the deeper soil. The synergistic down migration of biochar and heavy metals might pose less risks than the sole migration of soluble metals. That is, high IS might cause higher risks than high flow rate even though biochar and metals might transport further with high flow rate. These findings will advance the current knowledge on the migration risk involved in the in-situ remediation of heavy metal-contaminated soils by biochar.
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Affiliation(s)
- Yuan Liang
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China.
| | - Xingran Li
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China; School of Environmental Science and Engineering, Tianping College of Suzhou University of Science and Technology, Suzhou 215000, China
| | - Fan Yang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Sheng Liu
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, China
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21
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Luo Y, Tan C, He Y, Chen Y, Wan Z, Fu T, Wu Y. Rhizosphere activity induced mobilization of heavy metals immobilized by combined amendments in a typical lead/zinc smelter-contaminated soil. CHEMOSPHERE 2023; 313:137556. [PMID: 36528153 DOI: 10.1016/j.chemosphere.2022.137556] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 12/04/2022] [Accepted: 12/11/2022] [Indexed: 06/17/2023]
Abstract
The persistence of the stabilization effect of amendments on heavy metals (HMs) is of great concern when they are used for remediating HM-contaminated soil. Here, pot experiments were conducted to investigate the effects of two consecutive seasons of vegetable cultivation on the mobilization of HMs (Cu, Pb, Zn, and Cd) immobilized by different application ratios (0, 20, 40, and 80 g kg-1, labelled C0, C2, C4, and C8) of a combined amendments (lime: sepiolite: biochar: humic acid = 2:2:1:1). The results showed that HM bioavailability decreased with increasing application ratios of the combined amendments in control (CK) treatments. The DOC contents, HM bioavailability, and HM contents in the leaves of vegetables increased, but the pH decreased during two consecutive seasons of vegetable cultivation; however, the HM bioavailability in the C2, C4, and C8 treatments was lower than that in the C0 treatments with vegetables. Catalase, urease, alkaline phosphatase, and dehydrogenase activities in the combined amendment treatments with and without vegetables were decreased compared to those in the C0 treatments. The relative abundances of the dominant bacterial phyla in the different treatments were Actinobacteria > Proteobacteria > Chloroflexi > Acidobacteria > Gemmatimonadetes > Bacteroidetes for the first season and Proteobacteria > Actinobacteria > Chloroflexi > Acidobacteria > Bacteroidetes > Gemmatimonadetes for the second season. Correlations showed that the pH and DOM properties during two consecutive seasons of vegetable cultivation were important factors influencing HM bioavailability, enzyme activity, and bacterial community composition. The bacterial community composition shift indirectly influenced the mobilization of HMs immobilized by the combined amendments. Thus, rhizosphere activity induced the mobilization of HMs immobilized by combined amendments during two consecutive seasons of vegetable cultivation.
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Affiliation(s)
- Youfa Luo
- Key Laboratory of Kast Georesources and Environment, Ministry of Education, Guizhou University, Guiyang, 550025, China; Guizhou Karst Environmental Ecosystems Observation and Research Station, Ministry of Education, Guizhou University, Guiyang, 550025, China; Guizhou Hostile Environment Ecological Restoration Technology Engineering Research Centre, Guizhou University, Guiyang, 550025, China.
| | - Chuanjing Tan
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Yu He
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Yulu Chen
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Zuyan Wan
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Tianling Fu
- The New Rural Development Research Institute, Guizhou University, Guiyang, 550025, China
| | - Yonggui Wu
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China; Guizhou Karst Environmental Ecosystems Observation and Research Station, Ministry of Education, Guizhou University, Guiyang, 550025, China; Guizhou Hostile Environment Ecological Restoration Technology Engineering Research Centre, Guizhou University, Guiyang, 550025, China
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22
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Guo Z, Zhang Y, Xu R, Xie H, Xiao X, Peng C. Contamination vertical distribution and key factors identification of metal(loid)s in site soil from an abandoned Pb/Zn smelter using machine learning. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 856:159264. [PMID: 36208763 DOI: 10.1016/j.scitotenv.2022.159264] [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: 08/12/2022] [Revised: 09/29/2022] [Accepted: 10/02/2022] [Indexed: 06/16/2023]
Abstract
Soil heterogeneity makes the vertical distribution of metal(loid)s in site soil vary considerably and poses a challenge for identifying the key factors of metal(loid)s migration in site soil profiles. In this study, a machine learning (ML) model was developed to study a typical abandoned Pb/Zn smelter using 267 site soils from 46 drilling points. Results showed that a well-trained ML model could be used to identify the key factors in determining the contamination vertical distribution and predict the metal(loid)s contents in subsurface soil. As, Cd, Pb, and Zn were the primary pollutants and their vertical migration depth arrived to 4-6 m. Based on the predictive performance of different ML algorithms, the extreme gradient boosting (XGB) was selected as the best model to produce accurate predictions for the most metal(loid)s content. Contents of As, Cd, Pb, and Zn in the heavily contaminated zones declined with an increase of soil depth. The metal(loid) contents in surface soil of 0-2 m could be readily used to predict the content of Cd, Cr, Hg, and Zn in subsurface soil from 2 m to 10 m. Based on the metal-specific XGB models, sulfur content, functional area, and soil texture were identified as key factors affecting the vertical distribution of As, Cd, Pb, and Zn in site soil. Results suggested the ML method is helpful to manage the potential environmental risks of metal(loid)s in Pb/Zn smelting site.
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Affiliation(s)
- Zhaohui Guo
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China
| | - Yunxia Zhang
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China
| | - Rui Xu
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.
| | - Huimin Xie
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China
| | - Xiyuan Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China
| | - Chi Peng
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China
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23
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Yan C, Wang W, Nie M, Ding M, Wang P, Zhang H, Huang G. Characterization of copper binding to biochar-derived dissolved organic matter: Effects of pyrolysis temperature and natural wetland plants. JOURNAL OF HAZARDOUS MATERIALS 2023; 442:130076. [PMID: 36193612 DOI: 10.1016/j.jhazmat.2022.130076] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 09/12/2022] [Accepted: 09/25/2022] [Indexed: 06/16/2023]
Abstract
Characterization of the biochar-derived dissolved organic matter (BDOM) is essential to understanding the environmental efficacy of biochar and the behavior of heavy metals. In this study, the binding properties of BDOM derived from different pyrolysis temperatures, wetland plants, and plant organs with Cu was investigated based on a multi-analytical approach. In general, the pyrolysis temperature exhibited a more significant impact on both the spectral characteristics of BDOM and Cu binding behavior than those of the feedstocks. With the pyrolysis temperature increased, the dissolved organic carbon, aromaticity, and fluorescence substance of BDOM decreased and the structure became more condensed. Humic-and tryptophan-like substance was more susceptible to the addition of Cu for BDOM pyrolyzed at 300 ℃ and 500 ℃, respectively. In addition, the more tyrosine-like substance is involved in Cu binding at higher pyrolysis temperature (500 ℃). However, the fluvic-like substance occurred preferentially with Cu than the other fluorophores. Moreover, the higher binding capacity for Cu was exhibited by the humic-like substance and by BDOM derived from the higher pyrolysis temperature and the lower elevation plants with the corresponding average stability constants (log KM) of 5.58, 5.36, and 5.16.
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Affiliation(s)
- Caixia Yan
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Wangyu Wang
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Minghua Nie
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China; Key Laboratory of Eco-geochemistry, Ministry of Natural Resource, Beijing 100037, China.
| | - Mingjun Ding
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China.
| | - Peng Wang
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Hua Zhang
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
| | - Gaoxiang Huang
- School of Geography and Environment, Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, China
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