Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar.
Yi-Min Wang,Shao-wei Wang,Cheng-Qian Wang,Zhi-yuan Zhang,Jia-Qi Zhang,Meng Meng,Ming Li,Minori Uchimiya,And Xu-Yin Yuan +8 more
TLDR
It is shown that FCB application reduces the environmental mobility of metals in Cd-As contaminated soil, while it also increases soil pH and available nutrient mobility, improving soil environmental quality and reducing remediation costs.Abstract:
Remediation of soil heavy metal by biochar has been extensively studied. However, few studies focused on the role of biochar on the co-immobilization of cadmium (Cd(II)) and arsenate (As(V)) and related soil nutrient availability. Remediation tests were conducted with three types of pristine and ferric trichloride (FeCl3) modified biochar (rice, wheat, and corn straw biochar) in Cd-As co-contaminated soil, with application rates of 1, 5, and 10% (w/w) and the incubation of 1, 7, 10, and 15 days. Using TCLP (Toxicity Characteristic Leaching Procedure) method, 10% of FeCl3 modified corn-straw derived biochar (FCB) had the highest immobilization efficiency of Cd(II) (63.21%) and As(V) (95.10%) after 10 days of the incubation. Iron-modified biochar immobilized higher fractions of water-soluble (F1) and surface-absorbed (F2) metal fractions than pristine biochar. For FCB amendment, Cd was mostly presented in the organic matter (OM) and sulfides associated (F4) and residual (F5) fractions (88.52%), as was found in the Fe-Al (oxides and hydroxides) (F3), F4, and F5 fractions (75.87%). FCB amendment increased soil pH values and available iron contents (p 0.05). This study showed that FCB application reduces the environmental mobility of metals in Cd-As contaminated soil, while it also increases soil pH and available nutrient mobility, improving soil environmental quality and reducing remediation costs.read more
Citations
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Arsenite and arsenate binding to ferrihydrite organo-mineral coprecipitate: Implications for arsenic mobility and fate in natural environments.
TL;DR: The results of this study suggest that NOM interacts with arsenic in ways that promote arsenic mobility and especially promote the mobility of arsenate relative to arsenite, which is of great significance for evaluating the migration and bioavailability of arsenic in both natural and contaminated environments.
Journal ArticleDOI
Cd immobilization and soil quality under Fe–modified biochar in weakly alkaline soil
TL;DR: In this article, the effect of Fe-modified biochar on Cd bioavailability in soils and uptake by maize, soil aggregate distribution and stability, and microbial community composition in weakly alkaline Cd-contaminated soil was investigated.
Journal ArticleDOI
Biochar as environmental armour and its diverse role towards protecting soil, water and air.
TL;DR: A comprehensive review of the recent research findings and updates related to the diversified role of biochar is presented in this paper, where the authors highlight the critical role that biochar plays in various environmental applications, be it in soil, water or air.
Journal ArticleDOI
Biochar as environmental armour and its diverse role towards protecting soil, water and air
TL;DR: A comprehensive review of the recent research findings and updates related to the diversified role of biochar is presented in this article , where the authors highlight the critical role that biochar plays in various environmental applications, be it in soil, water or air.
References
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Biochar as a sorbent for contaminant management in soil and water: a review.
Mahtab Ahmad,Anushka Upamali Rajapaksha,Jung Eun Lim,Ming Zhang,Nanthi Bolan,Dinesh Mohan,Meththika Vithanage,Sang Soo Lee,Yong Sik Ok,Yong Sik Ok,Yong Sik Ok +10 more
TL;DR: Due to complexity of soil-water system in nature, the effectiveness of biochars on remediation of various organic/inorganic contaminants is still uncertain.
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Mechanisms of metal sorption by biochars: Biochar characteristics and modifications
Hong-Bo Li,Xiaoling Dong,Evandro B. da Silva,Letuzia M. de Oliveira,Yanshan Chen,Lena Q. Ma,Lena Q. Ma +6 more
TL;DR: This review summarizes the characteristics of biochar (e.g., surface area, porosity, pH, surface charge, functional groups, and mineral components) and main mechanisms governing sorption of As, Cr, Cd, Pb, and Hg by biochar and includes competitive sorption mechanisms of co-existing metals.
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Dairy-manure derived biochar effectively sorbs lead and atrazine.
TL;DR: Results from this study indicated that dairy manure can be converted into value-added biochar as effective sorbent for metal and/or organic contaminants.
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Engineered/designer biochar for contaminant removal/immobilization from soil and water: Potential and implication of biochar modification
Anushka Upamali Rajapaksha,Season S. Chen,Daniel C.W. Tsang,Ming Zhang,Meththika Vithanage,Sanchita Mandal,Bin Gao,Nanthi Bolan,Yong Sik Ok +8 more
TL;DR: Modification to produce engineered/designer biochar is likely to enhance the sorption capacity of biochar and its potential applications for environmental remediation.