Reduction of Cr(VI) in simulated groundwater by FeS-coated iron magnetic nanoparticles

Gong, Yanyan, Gai, Longshuang, Tang, Jingchun, Fu, Jie, Wang, Qilin and Zeng, Eddy Y. (2017) Reduction of Cr(VI) in simulated groundwater by FeS-coated iron magnetic nanoparticles. Science of the Total Environment, 595 743-751. doi:10.1016/j.scitotenv.2017.03.282


Author Gong, Yanyan
Gai, Longshuang
Tang, Jingchun
Fu, Jie
Wang, Qilin
Zeng, Eddy Y.
Title Reduction of Cr(VI) in simulated groundwater by FeS-coated iron magnetic nanoparticles
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 1879-1026
0048-9697
Publication date 2017-10-01
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2017.03.282
Open Access Status Not yet assessed
Volume 595
Start page 743
End page 751
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Subject 2305 Environmental Engineering
2304 Environmental Chemistry
2311 Waste Management and Disposal
2310 Pollution
Abstract FeS-coated iron (Fe/FeS) magnetic nanoparticles were easily prepared, characterized, and applied for Cr(VI) removal in simulated groundwater. TEM, XRD, and BET characterization tests showed that FeS coating on the surface of Fe inhibited the aggregation of Fe and that Fe/FeS at a S/Fe molar ratio of 0.207 possessed a large surface area of 62.1 m/g. Increasing the S/Fe molar ratio from 0 to 0.138 decreased Cr(VI) removal by 42.8%, and a further increase to 0.207 enhanced Cr(VI) removal by 63% within 72 h. Moreover, Fe/FeS inhibited the leaching of Fe, reducing the toxicity of the particles. Mechanistic analysis indicated that Fe, Fe, and S were synergistically involved in the reduction of Cr(VI) to nontoxic Cr(III), which further precipitated as (CrFe)(OH) and Cr(III)-Fe-S. The process of Cr(VI) sorption by Fe/FeS (S/Fe = 0.207) was fitted well with a pseudo-second-order kinetic model, and the isotherm data were simulated by Langmuir isotherm model with a maximum sorption capacity of 69.7 mg/g compared to 48.9 mg/g for Fe. Low pH and initial Cr(VI) concentration favored Cr(VI) removal. Continuous fixed bed column studies showed that simulated permeable reactive barriers (PRB) with Fe/FeS was considerably effective for in situ removal of Cr(VI) from groundwater. This study demonstrated the high potential of Fe/FeS for Cr(VI) immobilization in water, groundwater, and soil.
Formatted abstract
FeS-coated iron (Fe/FeS) magnetic nanoparticles were easily prepared, characterized, and applied for Cr(VI) removal in simulated groundwater. TEM, XRD, and BET characterization tests showed that FeS coating on the surface of Fe0 inhibited the aggregation of Fe0 and that Fe/FeS at a S/Fe molar ratio of 0.207 possessed a large surface area of 62.1 m2/g. Increasing the S/Fe molar ratio from 0 to 0.138 decreased Cr(VI) removal by 42.8%, and a further increase to 0.207 enhanced Cr(VI) removal by 63% within 72 h. Moreover, Fe/FeS inhibited the leaching of Fe, reducing the toxicity of the particles. Mechanistic analysis indicated that Fe0, Fe2+, and S2− were synergistically involved in the reduction of Cr(VI) to nontoxic Cr(III), which further precipitated as (CrxFe1-x)(OH)3 and Cr(III)-Fe-S. The process of Cr(VI) sorption by Fe/FeS (S/Fe = 0.207) was fitted well with a pseudo-second-order kinetic model, and the isotherm data were simulated by Langmuir isotherm model with a maximum sorption capacity of 69.7 mg/g compared to 48.9 mg/g for Fe0. Low pH and initial Cr(VI) concentration favored Cr(VI) removal. Continuous fixed bed column studies showed that simulated permeable reactive barriers (PRB) with Fe/FeS was considerably effective for in situ removal of Cr(VI) from groundwater. This study demonstrated the high potential of Fe/FeS for Cr(VI) immobilization in water, groundwater, and soil.
Keyword Cr(VI) removal
Fe/FeS nanoparticles
Groundwater
Remediation
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 31270544
41503085
[2015]1098
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Advanced Water Management Centre Publications
 
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