Stabilization of chromium(VI) by hydroxysulfate green rust in chromium(VI)-contaminated soils

Chromium (Cr)-contaminated soils pose a great environmental risk, with high solubility and persistent leaching of Cr(VI). In this study, hydroxysulfate green rust (GRSO4), with the general formula Fe(II)4Fe(III)2(OH)12SO4·8H2O, was evaluated for its efficiency in Cr(VI) stabilization via Cr(VI) redu...

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Vydáno v:Pedosphere Ročník 31; číslo 4; s. 645 - 657
Hlavní autoři: ALIDOKHT, Leila, OUSTAN, Shahin, KHATAEE, Alireza, NEYSHABURI, Mohammad R., REYHANITABAR, Adel
Médium: Journal Article
Jazyk:angličtina
Vydáno: Beijing Elsevier Ltd 01.08.2021
Elsevier Science Ltd
Research Laboratory of Advanced Water and Wastewater Treatment Processes,Department of Applied Chemistry,Faculty of Chemistry,University of Tabriz,Tabriz 51666-16471,Iran%Faculty of Agriculture,Department of Soil Science,University of Tabriz,Tabriz 51666-16471,Iran%Research Laboratory of Advanced Water and Wastewater Treatment Processes,Department of Applied Chemistry,Faculty of Chemistry,University of Tabriz,Tabriz 51666-16471,Iran
Department of Environmental Engineering,Gebze Technical University,Gebze 41400,Turkey
Faculty of Agriculture,Department of Soil Science,University of Tabriz,Tabriz 51666-16471,Iran
Témata:
batch system
birnessite
Chromium
Cr(III) oxidation
Environmental risk
Field capacity
Green rust
Iron
layered double hydroxide
Leaching
Manganese
manganese monoxide
Manganese oxides
phosphates
Reduction
remediation
risk
Rusting
Soil contamination
Soil pollution
Soil remediation
Soils
solubility
Stabilization
stoichiometry
Trivalent chromium
batch system
layered double hydroxide
Cr(III) oxidation
reduction
soil remediation
birnessite
Cr(Ⅲ)oxidation
ISSN:1002-0160, 2210-5107
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Shrnutí:Chromium (Cr)-contaminated soils pose a great environmental risk, with high solubility and persistent leaching of Cr(VI). In this study, hydroxysulfate green rust (GRSO4), with the general formula Fe(II)4Fe(III)2(OH)12SO4·8H2O, was evaluated for its efficiency in Cr(VI) stabilization via Cr(VI) reduction to Cr(III) in four representative Cr(VI)-spiked soils. The initial concentrations of phosphate buffer-extractable Cr(VI) (Cr(VI)b) in soils 1, 2, 3, and 4 were 382.4, 575.9, 551.3, and 483.7 mg kg–1, respectively. Reduction of Cr(VI) to Cr(III) by structural Fe(II) (Fe(II)s) in GRSO4 in all studied soils was fast, wherein the application of GRSO4 markedly decreased the amount of Cr(VI)b at the Cr(VI)b/Fe(II)s stoichiometric mole ratio of 0.33. The kinetics of Cr(VI) reduction by GRSO4 could not be determined as this reaction coincided with the release of Cr(VI) from soil during the experiment. The concentration of Cr(VI)b decreased, as the Cr(VI)b/Fe(II)s ratio decreased from 0.46 to 0.20, generally to below 10 mg kg–1. Back-transformation of the generated Cr(III) was examined in the presence of manganese oxide birnessite at the birnessite/initial Cr(III) mole ratio of 4.5. The results of batch tests showed that only 5.2% of the initial Cr(III) was converted to Cr(VI) after two months, while under field capacity moisture conditions, less than 0.05% of the initial Cr(III) was oxidized to Cr(VI) after six months. The results illustrated that remediation of Cr(VI)-contaminated soils would be fast, successful, and irreversible with an appropriate quantity of fresh GRSO4.
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ISSN:1002-0160
2210-5107
DOI:10.1016/S1002-0160(21)60009-7