Remediation of hexavalent chromium contaminated soil by biochar-supported zero-valent iron nanoparticles

•NZVI@BCwassynthesisedandusedintheremediationofCr(VI)-contaminated soil.•NZVI@BC could effectively immobilise Cr(VI) in soil.•The EX fraction of Cr was almost completely converted to OX and OM.•Such remediation improved soil fertility and didn't cause excess iron leaching.•The phytotoxicity of...

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Bibliographic Details
Published in:Journal of hazardous materials 2016-11, Vol.318, p.533-540
Main Authors: Su, Huijie, Fang, Zhanqiang, Tsang, Pokeung Eric, Zheng, Liuchun, Cheng, Wen, Fang, Jianzhang, Zhao, Dongye
Format: Article
Language:English
Subjects:
Biochar (BC)
Biodegradation, Environmental
Brassica
Brassica - drug effects
Brassica - growth & development
Charcoal - chemistry
Chromium - analysis
Cr(VI)-contaminated soil
Environmental Restoration and Remediation
Ferric Compounds - chemistry
Hexavalent chromium
Iron
Iron - chemistry
Leaching
Manganese Compounds - chemistry
Metal Nanoparticles - chemistry
Mustard
Mustard Plant - drug effects
Mustard Plant - growth & development
Nanoparticles
Oxides
Oxides - chemistry
Phytotoxicity
Remediation
Seedlings - drug effects
Seedlings - growth & development
Soil (material)
Soil fertility
Soil Pollutants - chemistry
Zero-valent iron nanoparticles (nZVI)
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Summary:•NZVI@BCwassynthesisedandusedintheremediationofCr(VI)-contaminated soil.•NZVI@BC could effectively immobilise Cr(VI) in soil.•The EX fraction of Cr was almost completely converted to OX and OM.•Such remediation improved soil fertility and didn't cause excess iron leaching.•The phytotoxicity of Cr(VI) was significantly reduced by nZVI@BC. In this study, a kind of high-efficiency and low-cost biochar-supported zero-valent iron nanoparticles (nZVI@BC) was synthesised and used in the remediation of Cr(VI)-contaminated soil. The remediation tests indicated that the immobilisation efficiency of Cr(VI) and Crtotal was 100% and 91.94%, respectively, by 8g nZVI@BC per kg soil for 15 d of remediation. Further investigations showed that exchangeable Cr was almost completely converted to Fe-Mn oxides and organic matter. Moreover, nZVI@BC could effectively improve soil fertility and reduce the leachability of Fe caused by nZVI. At the same time, the cabbage mustard growth experiments indicated that the phytotoxicity of Cr(VI) and Fe in the seedlings was effectively decreased by nZVI@BC treatment, and that the cabbage mustard growth was enhanced.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2016.07.039