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Yin C, Lei W, Wang S, Xie G, Qiu D. Biochar and arbuscular mycorrhizal fungi promote rapid-cycling Brassica napus growth under cadmium stress. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 953:176034. [PMID: 39236812 DOI: 10.1016/j.scitotenv.2024.176034] [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: 06/07/2024] [Revised: 09/02/2024] [Accepted: 09/02/2024] [Indexed: 09/07/2024]
Abstract
PURPOSE To explore the mechanisms of tolerance of Brassica napus to ultra-high concentration cadmium pollution and the synergistic effects of biochar (BC) and Arbuscular mycorrhizal fungi (AMF) on plant growth under cadmium (Cd) stress. RESULTS The application of 5 % BC and inoculation with 10 g AMF significantly promoted the growth and development of B. napus. The combined application of BC and AMF (BC1A and BC2A) was better than the single application. At the Cd 200 mg/kg level, BC1A increased the fresh weight and Cd content of the above-ground parts of B. napus by 35.5 % and decreased by 21.20 %. The SOD and POD activities increased by 30.63 % and 73.37 %. The MDA and H2O2 contents decreased by 40.8 % and 69.99 %, soluble sugar content increased by 37.96 %. At the Cd 300 mg/kg level, BC1A increased the fresh weight and Cd content of the above-ground parts of B. napus by 32.8 % and decreased by 15.99 %. The SOD and POD activities increased by 39.06 % and 93.56 %. The MDA and H2O2 contents decreased by 28.39 % and 72.45 %, and the soluble sugar content increased by 21.16 %. Overall, both BC and AMF treatments alone or in combination (BC1A) were able to alleviate Cd stress and promote plant growth, with the combination of biochar and AMF being the most effective. Furthermore, transcriptome analyses indicated that BC may improve cadmium resistance in B. napus by significantly up-regulating the expression of genes related to peroxidase, photosynthesis, and plant MAPK signaling pathways. AMF may alleviate the toxicity of Cd stress on B. napus by up-regulating the expression of genes related to peroxisomes, phytohormone signaling, and carotenoid biosynthesis. The results of the study will provide support for ecological restoration technology in extremely heavy metal-polluted environments and provide some reference for the application and popularization of BC and AMF conjugation technology.
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Affiliation(s)
- Chunru Yin
- Center of Space Exploration, Ministry of Education, Chongqing University, Chongqing 400044, China; School of Life Sciences, Chongqing University, Chongqing 401331, China; Chongqing Research Institute of NCU, Chongqing 402660, China
| | - Weixia Lei
- Crop Institute, Anhui Academy of Agricultural Sciences, Hefei 230031, China
| | - Sijie Wang
- Center of Space Exploration, Ministry of Education, Chongqing University, Chongqing 400044, China; School of Life Sciences, Chongqing University, Chongqing 401331, China; Chongqing Research Institute of NCU, Chongqing 402660, China
| | - Gengxin Xie
- Center of Space Exploration, Ministry of Education, Chongqing University, Chongqing 400044, China; Chongqing Research Institute of NCU, Chongqing 402660, China; Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400044, China.
| | - Dan Qiu
- Center of Space Exploration, Ministry of Education, Chongqing University, Chongqing 400044, China; School of Life Sciences, Chongqing University, Chongqing 401331, China; Chongqing Research Institute of NCU, Chongqing 402660, China.
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Liu C, Ye J, Lin Y, Wu X, Price GW, Wang Y. Effect of natural aging on biochar physicochemical property and mobility of Cd (II). Sci Rep 2024; 14:22214. [PMID: 39333259 PMCID: PMC11436867 DOI: 10.1038/s41598-024-72771-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Accepted: 09/10/2024] [Indexed: 09/29/2024] Open
Abstract
This project utilized both field experiment and laboratory analyses to address the gap in understanding regarding the alterations in properties and functions of biochar, and the impact of heavy metal passivation in soil over long-term natural field aging. The study aimed to examine the changes in the physical and chemical characteristics of biochar over an extended period of natural aging. Additionally, it sought to analyze the impact and mechanisms of biochar in reducing of the harmful effects of the heavy metal cadmium (Cd) during the aging process. Both original and aged biochar conformed to the pseudo-second-order kinetics model and the Langmuir model. The aging process enhanced the adsorption of Cd by biochar and mitigated the leaching of Cd2+ into the soil. These findings provide a scientific basis for evaluating biochar's environmental behavior and its potential use in the remediation of soil contaminated with heavy metals.
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Affiliation(s)
- Cenwei Liu
- Institute of Resources, Environment and Soil Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, Fujian, China
- Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou, 350003, Fujian, China
| | - Jing Ye
- Institute of Resources, Environment and Soil Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, Fujian, China
- Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou, 350003, Fujian, China
| | - Yi Lin
- Institute of Resources, Environment and Soil Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, Fujian, China
- Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou, 350003, Fujian, China
| | - Xiaomei Wu
- Institute of Food Science and Technology, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, Fujian, China
| | - G W Price
- Faculty of Agriculture, Dalhousie University, Truro, NS, B2N 5E3, Canada
| | - Yixiang Wang
- Institute of Resources, Environment and Soil Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, Fujian, China.
- Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou, 350003, Fujian, 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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Nawab J, Ghani J, Ullah S, Ahmad I, Akbar Jadoon S, Ali S, Hamidova E, Muhammad A, Waqas M, Din ZU, Khan S, Khan A, Ur Rehman SA, Javed T, Luqman M, Ullah Z. Influence of agro-wastes derived biochar and their composite on reducing the mobility of toxic heavy metals and their bioavailability in industrial contaminated soils. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2024; 26:1824-1838. [PMID: 38832561 DOI: 10.1080/15226514.2024.2357640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
The agro-waste derived valuable products are prime interest for effective management of toxic heavy metals (THMs). The present study investigated the efficacy of biochars (BCs) on immobilization of THMs (Cr, Zn, Pb, Cu, Ni and Cd), bioaccumulation and health risk. Agro-wastes derived BCs including wheat straw biochar (WSB), orange peel biochar (OPB), rice husk biochar (RHB) and their composite biochar (CB) were applied in industrial contaminated soil (ICS) at 1% and 3% amendments rates. All the BCs significantly decreased the bioavailable THMs and significantly (p < 0.001) reduced bioaccumulation at 3% application with highest efficiency for CB followed by OPB, WSB and RHB as compared to control treatment. The bioaccumulation factor (BAF), concentration index (CI) and ecological risk were decreased with all BCs. The hazard quotient (HQ) and hazard index (HI) of all THMs were <1, except Cd, while carcer risk (CR) and total cancer risk index (TCRI) were decreased through all BCs. The overall results depicted that CB at 3% application rate showed higher efficacy to reduce significantly (p < 0.001) the THMs uptake and reduced health risk. Hence, the present study suggests that the composite of BCs prepared from agro-wastes is eco-friendly amendment to reduce THMs in ICS and minimize its subsequent uptake in vegetables.
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Affiliation(s)
- Javed Nawab
- Department of Environmental Sciences, Kohat University of Science and Technology Kohat, Kohat, Pakistan
| | - Junaid Ghani
- Department of Biological, Geological and Environmental Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Sajid Ullah
- School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China
| | - Imran Ahmad
- Department of Horticulture, The University of Agriculture Peshawar, Peshawar, Pakistan
| | - Sultan Akbar Jadoon
- Department of Plant Breeding and Genetics, The University of Agriculture Peshawar, Peshawar, Pakistan
| | - Shaukat Ali
- Department of Environmental Sciences, Karakoram International University, Gilgit-Baltistan, Pakistan
| | - Emiliya Hamidova
- Department of Earth and Environmental Sciences, University of Milano Bicocca, Milan, Italy
| | - Asim Muhammad
- Department of Agronomy, The University of Agriculture Peshawar, Peshawar, Pakistan
| | - Muhammad Waqas
- Department of Environmental Sciences, Kohat University of Science and Technology Kohat, Kohat, Pakistan
| | - Zia Ud Din
- Department of Environmental Sciences, Kohat University of Science and Technology Kohat, Kohat, Pakistan
| | - Sardar Khan
- Department of Environmental Sciences, University of Peshawar, Peshawar, Pakistan
| | - Ajmal Khan
- Department of Environmental Sciences, Kohat University of Science and Technology Kohat, Kohat, Pakistan
| | - Syed Aziz Ur Rehman
- Department of Environmental Sciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Tehseen Javed
- Department of Environmental Sciences, Kohat University of Science and Technology Kohat, Kohat, Pakistan
| | - Muhammad Luqman
- Department of Environmental Sciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Zahid Ullah
- State Key Laboratory of Biogeology and Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan, China
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Qiu J, Fernandes de Souza M, Wang X, Chafik Y, Morabito D, Ronsse F, Ok YS, Meers E. Dynamic performance of combined biochar from co-pyrolysis of pig manure with invasive weed: Effect of natural aging on Pb and As mobilization in polluted mining soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 935:173424. [PMID: 38782284 DOI: 10.1016/j.scitotenv.2024.173424] [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: 02/19/2024] [Revised: 05/02/2024] [Accepted: 05/19/2024] [Indexed: 05/25/2024]
Abstract
Due to the natural biochar aging, the improvement of soil quality and immobilization of soil pollutants achieved by biochar may change; understanding the dynamic evolution of the in situ performance of biochar in these roles is essential to discuss the long-term sustainability of biochar remediation. Therefore, in this study, combined biochar from co-pyrolysis of pig manure and invasive Japanese knotweed - P1J1, as well as pure pig manure - PM - and pure Japanese knotweed - JK - derived biochar were applied to investigate their remediation performance in a high As- and Pb-polluted soil with prolonged incubation periods (up to 360 days). Biochar application, especially P1J1 and PM, initially promoted soil pH, dissolved organic carbon, and EC, but the improvements were not constant through time. The JK-treated soil exhibited the highest increase of soil organic matter (OM), followed by P1J1 and then PM, and OM did not change with aging. Biochar, especially P1J1, was a comprehensive nutrient source of Ca, K, Mg, and P to improve soil fertility. However, while soluble cationic Ca, K, and Mg increased with time, anionic P decreased over time, indicating that continuous P availability might not be guaranteed with the aging process. The total microorganism content declined with time; adding biochars slowed down this tendency, which was more remarkable at the later incubation stage. Biochar significantly impeded soil Pb mobility but mobilized soil As, especially in PM- and P1J1-treated soils. However, mobilized As gradually re-fixed in the long run; meanwhile, the excellent Pb immobilization achieved by biochars was slightly reduced with time. The findings of this study offer fresh insights into the alterations in metal(loid)s mobility over an extended duration, suggesting that the potential mobilization risk of As is reduced while Pb mobility slightly increases over time.
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Affiliation(s)
- Jing Qiu
- Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Ghent, Belgium.
| | - Marcella Fernandes de Souza
- Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Ghent, Belgium
| | - Xiaolin Wang
- Future Energy Center, School of Business, Society and Engineering, Mälardalen University, 722 23 Västerås, Sweden
| | - Yassine Chafik
- INRA USC1328, LBLGC EA 1207, University of Orleans, Rue de Chartres, BP 6759, 45067 Orléans Cedex 2, France
| | - Domenico Morabito
- INRA USC1328, LBLGC EA 1207, University of Orleans, Rue de Chartres, BP 6759, 45067 Orléans Cedex 2, France
| | - Frederik Ronsse
- Thermochemical Conversion of Biomass Research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
| | - Yong Sik Ok
- Korea Biochar Research Center, APRU Sustainable Waste Management Program & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Erik Meers
- Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Ghent, Belgium
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Long XX, Yu ZN, Liu SW, Gao T, Qiu RL. A systematic review of biochar aging and the potential eco-environmental risk in heavy metal contaminated soil. JOURNAL OF HAZARDOUS MATERIALS 2024; 472:134345. [PMID: 38696956 DOI: 10.1016/j.jhazmat.2024.134345] [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: 12/07/2023] [Revised: 04/15/2024] [Accepted: 04/17/2024] [Indexed: 05/04/2024]
Abstract
Biochar is widely accepted as a green and effective amendment for remediating heavy metals (HMs) contaminated soil, but its long-term efficiency and safety changes with biochar aging in fields. Currently, some reviews have qualitatively summarized biochar aging methods and mechanisms, aging-induced changes in biochar properties, and often ignored the potential eco-environmental risk during biochar aging process. Therefore, this review systematically summarizes the study methods of biochar aging, quantitatively compares the effects of different biochar aging process on its properties, and discusses the potential eco-environmental risk due to biochar aging in HMs contaminated soil. At present, various artificial aging methods (physical aging, chemical aging and biological aging) rather than natural field aging have been applied to study the changes of biochar's properties. Generally, biochar aging increases specific surface area (SSA), pore volume (PV), surface oxygen-containing functional group (OFGs) and O content, while decreases pH, ash, H, C and N content. Chemical aging method has a greater effect on the properties of biochar than other aging methods. In addition, biochar aging may lead to HMs remobilization and produce new types of pollutants, such as polycyclic aromatic hydrocarbons (PAHs), environmentally persistent free radicals (EPFRs) and colloidal/nano biochar particles, which consequently bring secondary eco-environmental risk. Finally, future research directions are suggested to establish a more accurate assessment method and model on biochar aging behavior and evaluate the environmental safety of aged biochar, in order to promote its wider application for remediating HMs contaminated soil.
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Affiliation(s)
- Xin-Xian Long
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, Guangdong 510642, China; Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China.
| | - Ze-Ning Yu
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Shao-Wen Liu
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Ting Gao
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Rong-Liang Qiu
- Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, Guangdong 510642, China; Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China.
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Yang S, Dong Z, Zhu B, Yan X, Huang J, Xie X, Chang Z, Tian S, Ning P. Feasibility and solidification mechanism study of self-sustaining smoldering remediation for copper and lead-contaminated soil. ENVIRONMENTAL RESEARCH 2024; 250:118498. [PMID: 38382665 DOI: 10.1016/j.envres.2024.118498] [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: 12/12/2023] [Revised: 01/24/2024] [Accepted: 02/14/2024] [Indexed: 02/23/2024]
Abstract
Soil heavy metal pollution is an important issue that affects human health and ecological well-being. In-situ thermal treatment techniques, such as self-sustaining smoldering combustion (SSS), have been widely studied for the treatment of organic pollutants. However, the lack of fuel in heavy metal-contaminated soil has hindered its application. In this study, we used corn straw as fuel to investigate the feasibility of SSS remediation for copper and lead in heavy metal-contaminated soil, as well as to explore the remediation mechanism. The results of the study showed that SSS increased soil pH, electrical conductivity (EC), total phosphorus (TP), total potassium (TK), rapidly available phosphorus (AP), and available potassium (AK), while decreasing total nitrogen (TN), alkali-hydrolyzed nitrogen (AN), and cation exchange capacity (CEC). The oxidation state of copper (Cu) increased from 10% to 21%-40%, and the residual state of lead (Pb) increased from 18% to 51%-73%. The Toxicity characteristic leaching procedure (TCLP) of Cu decreased by a maximum of 81.08%, and the extracted state of Diethylenetriaminepentaacetic acid (DTPA) decreased by 67.63%; the TCLP of Pb decreased by a maximum of 81.87%, and DTPA decreased by a maximum of 85.68%. The study indicates that SSS using corn straw as fuel successfully achieved remediation of heavy metal-contaminated soil. However, SSS does not reduce the content of copper and lead; it only changes their forms in the soil. The main reasons for the fixation of copper and lead during the SSS process are the adsorption of biochar, complexation with -OH functional groups, binding with π electrons, and the formation of crystalline compounds. This research provides a reference for the application of SSS in heavy metal-contaminated soil and has potential practical implications.
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Affiliation(s)
- Shunfu Yang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Zejing Dong
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Bin Zhu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Ximing Yan
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Jianhong Huang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China.
| | - Xin Xie
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Zhaofeng Chang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Senlin Tian
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
| | - Ping Ning
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, PR China
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Meng Z, Huang S, Zhao Q, Xin L. Respective evolution of soil and biochar on competitive adsorption mechanisms for Cd(II), Ni(II), and Cu(II) after 2-year natural ageing. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:133938. [PMID: 38479140 DOI: 10.1016/j.jhazmat.2024.133938] [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: 01/29/2024] [Revised: 02/22/2024] [Accepted: 02/29/2024] [Indexed: 04/07/2024]
Abstract
To reveal the respective evolution of soil and biochar on competitive heavy metal adsorption mechanisms after natural ageing, three soils and two biochars were tested in this study. The soil-biochar interlayer samples were buried in the field for 0.5, 1, and 2 years, for which competitive adsorption characteristics and mechanisms of soils and biochars in four systems (Cd, Cd+Ni, Cd+Cu, and Cd+Ni+Cu) were investigated. Results showed that physicochemical properties, adsorption capacity and mechanisms of soils and biochars all changed the most in the first 0.5 years. The properties and adsorption capacity of biochars gradually weakened with the ageing time, meanwhile, those of soils gradually enhanced. After co-ageing with acidic soil for 0.5 years, the Cd(II) adsorption capacity of modified biochar decreased by 86.59% in the ternary system; meanwhile, that of acidic soil increased by 65.52%. The contributions of mineral mechanisms decreased significantly, while non-mineral mechanisms were slightly affected by ageing. This study highlighted that when using biochar to remediate heavy metal-contaminated soils, biochar should be applied at least half a year in advance before planting crops so that biochar can fully contact and react with the soil.
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Affiliation(s)
- Zhuowen Meng
- State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China
| | - Shuang Huang
- State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China.
| | - Qin Zhao
- State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China
| | - Lei Xin
- State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China
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