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Remediation of hexavalent chromium spiked soil by using synthesized iron sulfide particles
Li, Yujie1; Wang, Wanyu1; Zhou, Liqiang2; Liu, Yuanyuan1; Mirza, Zakaria A.3; Lin, Xiang4
2017-02-01
摘要Carboxymethyl cellulose (CMC) stabilized microscale iron sulfide (FeS) particles were synthesized and applied to remediate hexavalent chromium (Cr(VI)) spiked soil. The effects of parameters including dosage of FeS particles, soil moisture, and natural organic matter (NOM) in soil were investigated with comparison to iron sulfate (FeSO4). The results show that the stabilized FeS particles can reduce Cr(VI) and immobilize Cr in soil quickly and efficiently. The soil moisture ranging from 40% to 70% and NOM in soil had no significant effects on Cr(VI) remediation by FeS particles. When molar ratio of FeS to Cr(VI) was 1.5:1, about 98% of Cr(VI) in soil was reduced by FeS particles in 3 d and Cr(VI) concentration decreased from 1407 mg kg(-1) to 16 mg kg(-1). The total Cr and Cr(VI) in Toxicity Characteristic Leaching Procedure (TCLP) leachate were reduced by 98.4% and 99.4%, respectively. In FeS particles-treated soil, the exchangeable Cr fraction was mainly converted to Fe-Mn oxides bound fraction because of the precipitation of Cr(III)-Fe(III) hydroxides. The physiologically based extraction test (PBET) bioaccessibility of Cr was decreased from 58.67% to 6.98%. Compared to FeSO4, the high Cr(VI) removal and Cr immobilization efficiency makes prepared FeS particles a great potential in field application of Cr(VI) contaminated soil remediation. (C) 2016 Elsevier Ltd. All rights reserved.
关键词Hexavalent chromium/Cr(VI) FeS particles Soil remediation Immobilization
DOI10.1016/j.chemosphere.2016.11.060
发表期刊CHEMOSPHERE
ISSN0045-6535
卷号169页码:131-138
通讯作者Liu, YY (reprint author), Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Minist Educ, Chongqing 400044, Peoples R China.
收录类别SCI
WOS记录号WOS:000393003300016
语种英语