AI Article Synopsis
- Carboxymethyl cellulose (CMC) stabilized microscale iron sulfide (FeS) particles were developed to effectively remediate hexavalent chromium (Cr(VI)) contaminated soil, demonstrating a high reduction rate of Cr(VI) when used in specified dosages.
- The study found that optimal remediation occurred at a molar ratio of FeS to Cr(VI) of 1.5:1, achieving a reduction of nearly 98% of Cr(VI) levels in just three days, while moisture and natural organic matter in the soil had little effect on the process.
- Compared to traditional iron sulfate (FeSO), the synthesized FeS particles showed superior efficiency in removing and immobilizing chromium
Article Abstract
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 (FeSO). 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 to 16 mg kg. 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 FeSO, 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.
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| http://dx.doi.org/10.1016/j.chemosphere.2016.11.060 | DOI Listing |
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