Mechanistic insights into the detoxification of Cr(VI) and immobilization of Cr and C during the biotransformation of ferrihydrite-polygalacturonic acid-Cr coprecipitates

Zhang，Hanyue1,2; Lu，Yang3; Ouyang，Zhuozhi5; Zhou，Wenjing4; Shen，Xinyue4; Gao，Kun4; Chen，Shuling4; Yang，Yang6; Hu，Shiwen4; Liu，Chongxuan4

2023-04-15

10.1016/j.jhazmat.2023.130726

JOURNAL OF HAZARDOUS MATERIALS   Impact Factor & Quartile

0304-3894

1873-3336

Coupled reactions among chromium (Cr), organic matter (OM), and iron (Fe) minerals play significant roles in Cr and carbon (C) cycling in Cr-contaminated soils. Although the inhibitory effects of Cr or polysaccharides acid (PGA) on ferrihydrite transformation have been widely studied, mechanistic insights into detoxification of Cr(VI) and immobilization of Cr and C during the microbially mediated reductive transformation of ferrihydrite remain unclear. In this study, underlying sequestration mechanisms of Cr and C during dissimilatory Fe reduction at various Cr/Fe ratios were investigated. Solid-phase analysis showed that reductive transformation rates of ferrihydrite were impeded by high Cr/Fe ratio and more magnetite was found at low Cr loadings. Microscopic analysis showed that formed Cr(III) was immobilized by magnetite and goethite through isomorphous substitution, whereas PGA was adsorbed on the crystalline Fe mineral surface. Spectroscopic results uncovered that binding of Fe minerals and PGA was achieved by surface complexation of structural Fe with carboxyl functional groups, and that the adhesion order of PGA functional groups and Fe minerals was influenced by the Cr/Fe ratios. These findings have significant implications for remediating Cr contaminants, realizing C fixation, and developing a quantitative model for Cr and C cycling by coupling reductive transformation in Cr-contaminated environments.

Chromium Detoxification Immobilization Polygalacturonic acid Reductive transformation of ferrihydrite

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1.CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu,610041,China
2.University of Chinese Academy of Sciences,Beijing,100049,China
3.South China Institute of Environmental Sciences,Ministry of Ecology and Environment (MEE),Guangzhou,7 West Street, Yuancun, Guangdong,510655,China
4.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of the Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
5.College of Natural Resources and Environment,Northwest A&F University,Yangling,Shaanxi,712100,China
6.National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China,Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management,Institute of Eco-environmental and Soil Sciences,Guangdong Academy of Sciences,Guangzhou,510650,China

Zhang，Hanyue,Lu，Yang,Ouyang，Zhuozhi,et al. Mechanistic insights into the detoxification of Cr(VI) and immobilization of Cr and C during the biotransformation of ferrihydrite-polygalacturonic acid-Cr coprecipitates[J]. JOURNAL OF HAZARDOUS MATERIALS,2023,448.

Zhang，Hanyue.,Lu，Yang.,Ouyang，Zhuozhi.,Zhou，Wenjing.,Shen，Xinyue.,...&Liu，Chongxuan.(2023).Mechanistic insights into the detoxification of Cr(VI) and immobilization of Cr and C during the biotransformation of ferrihydrite-polygalacturonic acid-Cr coprecipitates.JOURNAL OF HAZARDOUS MATERIALS,448.

Zhang，Hanyue,et al."Mechanistic insights into the detoxification of Cr(VI) and immobilization of Cr and C during the biotransformation of ferrihydrite-polygalacturonic acid-Cr coprecipitates".JOURNAL OF HAZARDOUS MATERIALS 448(2023).