Immobilization of Cr(VI) in Soil Using a Montmorillonite-Supported Carboxymethyl Cellulose-Stabilized Iron Sulfide Composite

Effectiveness and Biotoxicity Assessment

Bibliographic Data

ID15468226
AuthorsDading Zhang (China University of Mining and Technology), Yanqiu Xu (China University of Mining and Technology), Xiaofei Li (0000-0001-6508-2543, Beijing University of Chemical Technology), Zhenhai Liu (0000-0002-8245-676X, Nankai University), Lina Wang (0009-0002-3877-4928, China University of Mining and Technology), Chaojun Lu (Chinese Research Academy of Environmental Sciences), Xuwen He (China University of Mining and Technology), Yan Ma (0000-0001-9735-5868, China University of Mining and Technology, corresponding author), Dexun Zou (0000-0001-8930-0410, Beijing University of Chemical Technology, corresponding author)
Year2020
Volume17
Issue17
Pages6087-6087
Publication date2020-08-21
Open AccessYes
TypeARTICLE
VenueInternational Journal of Environmental Research and Public Health (JOURNAL)
Journal identifiersISSN: 1661-7827 • E-ISSN: 1660-4601
PublisherMultidisciplinary Digital Publishing Institute (PUBLISHER • CH)
DOI10.3390/ijerph17176087
PMID32825647
OpenAlexW3080865539
LanguageEN
References cited57

A novel composite of montmorillonite-supported carboxymethyl cellulose-stabilized nanoscale iron sulfide (CMC@MMT-FeS), prepared using the co-precipitation method, was applied to remediate hexavalent chromium (Cr(VI))-contaminated soil. Cr(VI)-removal capacity increased with increasing FeS-particle loading. We tested the efficacy of CMC@MMT-FeS at three concentrations of FeS: 0.2, 0.5, and 1 mmol/g, hereafter referred to as 0.2 CMC@MMT-FeS, 0.5 CMC@MMT-FeS, and 1.0 CMC@MMT-FeS, respectively. The soil Cr(VI) concentration decreased by 90.7% (from an initial concentration of 424.6 mg/kg to 39.4 mg/kg) after 30 days, following addition of 5% (composite-soil mass proportion) 1.0 CMC@MMT-FeS. When 2% 0.5 CMC@MMT-FeS was added to Cr(VI)-contaminated soil, the Cr(VI) removal efficiency, as measured in the leaching solution using the toxicity characteristic leaching procedure, was 90.3%, meeting the environmental protection standard for hazardous waste (5 mg/kg). The European Community Bureau of Reference (BCR) test confirmed that the main Cr fractions in the soil samples changed from acid-exchangeable fractions to oxidable fractions and residual fractions after 30 days of soil remediation by the composite. Moreover, the main complex formed during remediation was Fe(III)-Cr(III), based on BCR and X-ray photoelectron spectroscopy analyses. Biotoxicity of the remediated soils, using Vicia faba and Eisenia foetida , was analyzed and evaluated. Our results indicate that CMC@MMT-FeS effectively immobilizes Cr(VI), with widespread potential application in Cr(VI)-contaminated soil remediation

Carboxymethyl cellulose · Chromium · Contamination · Environmental remediation · Heavy metals · Hexavalent chromium · Iron sulfide · Leaching (pedology · Montmorillonite · Nuclear chemistry · Sodium · Soil water · Sulfide · Toxicity characteristic leaching procedure · Adsorption and biosorption for pollutant removal · Chemistry · Chromium effects and bioremediation · Environmental remediation with nanomaterials · Environmental Science · Environmental Chemistry

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