Reductive Sequestration of Cr(VI) and Immobilization of C during the Microbially Mediated Transformation of Ferrihydrite-Cr(VI)-Fulvic Acid Coprecipitates

Hu, Shiwen4,5; Zhang, Hanyue1,2,3; Yang, Yang4; Wang, Weiqi6; Zhou, Wenjing5; Shen, Xinyue5; Liu, Chongxuan5

2023-05-22

10.1021/acs.est.2c09803

ENVIRONMENTAL SCIENCE & TECHNOLOGY   影响因子和分区

0013-936X

1520-5851

["Uncoveringthe coupled kinetics of Cr-(VI) reduction andimmobilization of Cr-(III) and C during dissimilatory iron reductioncontributes to the synchronous sequestration of heavy metals and organicmatter in soil environments.","Cr-(VI) detoxification and organic matter (OM) stabilizationareusually influenced by the biological transformation of iron (Fe) minerals;however, the underlying mechanisms of metal-reducing bacteria on thecoupled kinetics of Fe minerals, Cr, and OM remain unclear. Here,the reductive sequestration of Cr-(VI) and immobilization of fulvicacid (FA) during the microbially mediated phase transformation offerrihydrite with varying Cr/Fe ratios were investigated. No phasetransformation occurred until Cr-(VI) was completely reduced, and theferrihydrite transformation rate decreased as the Cr/Fe ratio increased.Microscopic analysis was uncovered, which revealed that the resultingCr-(III) was incorporated into the lattice structure of magnetite andgoethite, whereas OM was mainly adsorbed on goethite and magnetitesurfaces and located within pore spaces. Fine line scan profiles showedthat OM adsorbed on the Fe mineral surface had a lower oxidation statethan that within nanopores, and C adsorbed on the magnetite surfacehad the highest oxidation state. During reductive transformation,the immobilization of FA by Fe minerals was predominantly via surfacecomplexation, and OM with highly aromatic and unsaturated structuresand low H/C ratios was easily adsorbed by Fe minerals or decomposedby bacteria, whereas Cr/Fe ratios had little effect on the bindingof Fe minerals and OM and the variations in OM components. Owing tothe inhibition of crystalline Fe minerals and nanopore formation inthe presence of Cr, Cr sequestration and C immobilization can be synchronouslyfavored at low Cr/Fe ratios. These findings provide a profound theoreticalbasis for Cr detoxification and synchronous sequestration of Cr andC in anoxic soils and sediments."]

iron minerals organic matter chromium phase transformation nanopores sequestration

SCI ; EI

英语

NI论文

通讯

China Postdoctoral Science Foundation[2021M701561] ; Guangdong Basic and Applied Basic Research Foundation[2021A1515110904] ; National Natural Science Foundation of China["42207249","41830861"] ; National Key Research and Development Program[2019YFC1803903]

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:001004514500001

AMER CHEMICAL SOC

20232514276341

Bacteria ; Biogeochemistry ; Chromium compounds ; Detoxification ; Magnetite ; Nanopores ; Organic acids ; Sediments

Geochemistry:481.2 ; Soil Mechanics and Foundations:483 ; Nanotechnology:761 ; Biochemistry:801.2 ; Physical Chemistry:801.4 ; Organic Compounds:804.1 ; Solid State Physics:933

ENVIRONMENT/ECOLOGY

Web of Science

1.Chinese Acad Sci, Chengdu Inst Biol, CAS Key Lab Mt Ecol Restorat & Bioresource Utiliza, Chengdu 610041, Peoples R China
2.Chinese Acad Sci, Chengdu Inst Biol, Biodivers Conservat Key Lab Sichuan Prov, Chengdu 610041, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Natl Reg Joint Engn Res Ctr Soil Pollut Control &, Guangdong Key Lab Integrated Agroenvironm Pollut C, Guangzhou 510650, Peoples R China
5.Southern Univ Sci & Technol, Sch Environm Sci & Engn, State Environm Protect Key Lab Integrated Surface, Shenzhen 518055, Peoples R China
6.Fujian Normal Univ, Inst Geog, Key Lab Humid Subtrop Ecogeog Proc, Minist Educ, Fuzhou 350007, Peoples R China

Hu, Shiwen,Zhang, Hanyue,Yang, Yang,et al. Reductive Sequestration of Cr(VI) and Immobilization of C during the Microbially Mediated Transformation of Ferrihydrite-Cr(VI)-Fulvic Acid Coprecipitates[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2023,57(22):8323-8334.

Hu, Shiwen.,Zhang, Hanyue.,Yang, Yang.,Wang, Weiqi.,Zhou, Wenjing.,...&Liu, Chongxuan.(2023).Reductive Sequestration of Cr(VI) and Immobilization of C during the Microbially Mediated Transformation of Ferrihydrite-Cr(VI)-Fulvic Acid Coprecipitates.ENVIRONMENTAL SCIENCE & TECHNOLOGY,57(22),8323-8334.

Hu, Shiwen,et al."Reductive Sequestration of Cr(VI) and Immobilization of C during the Microbially Mediated Transformation of Ferrihydrite-Cr(VI)-Fulvic Acid Coprecipitates".ENVIRONMENTAL SCIENCE & TECHNOLOGY 57.22(2023):8323-8334.