Fe-biochar for simultaneous stabilization of chromium and arsenic in soil: Rational design and long-term performance

Excess chromium (Cr) and arsenic (As) coexist in soil such as chromated copper arsenate (CCA) contaminated sites, leading to high risks of pollution. Fe-biochar with adjustable redox activity offers the possibility of simultaneous stabilization of Cr and As. Here, a series of Fe-biochar with distinc...

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Bibliographic Details
Published in:The Science of the total environment 2023-03, Vol.862, p.160843, Article 160843
Main Authors: Wang, Lubin, Luo, Yating, Pang, Jingli, Li, Yifan, Wu, Hanxin, Jiang, Xiaohan, Tong, Jianhao, Shi, Jiyan
Format: Article
Language:English
Subjects:
Adsorption
Arsenic
Charcoal - chemistry
Chromium - analysis
Cr/As
Fe-biochar
Leaching risk
Long-term stability
Reduction-oxidation
Soil
Soil Pollutants - analysis
Soil stabilization
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Summary:Excess chromium (Cr) and arsenic (As) coexist in soil such as chromated copper arsenate (CCA) contaminated sites, leading to high risks of pollution. Fe-biochar with adjustable redox activity offers the possibility of simultaneous stabilization of Cr and As. Here, a series of Fe-biochar with distinct Fe/C structure were rationally produced for the remediation of Cr and As contaminated soil (BCX-Fe, X represented the biomass/Fe ratio). Adsorption tests showed that maximal adsorption of BC5-Fe for Cr(VI) and As(III) reached 73.7 and 81.3 mg/g. A 90-day soil remediation experiment indicated that the introduction of 3% (w/w) Fe-biochar reduced the leaching state of Cr(VI) by 93.8–99.7% and As by 75.2–95.6%. Under simulated groundwater erosion for 10 years and acid rain leaching for 7.5 years, the release levels of Cr(VI) and As in the BC5-Fe remediated soil could meet the groundwater class IV standard in China (Cr(VI)
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2022.160843