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Photochemical Formation Process of Schwertmannite on Montmorillonite and Corresponding Cr(VI) Adsorption Capacity
Zhipeng Shu; Lihu Liu; Guohong Qiu; Xiong Yang; Mingzhe Zhang; Wenfeng Tan; Chengshuai Liu; Fei Wu
2019
Source PublicationACS Earth and Space Chemistry
Volume3Issue:5Pages:718-727
Abstract

The formation and transformation of schwertmannite affect the migration, conversion, and toxicity of chromium (Cr) in soils and sediments. Schwertmannite could be obtained from the oxidation of Fe(II) by hydroxyl radicals (OH) and superoxide radicals (O2•–) generated from the photolysis of NO3 under acidic and sulfate-rich conditions. As one of the most abundant components, montmorillonite is widely distributed in soils and sediments. However, the effect of montmorillonite on the photochemical formation process and corresponding Cr adsorption behaviors of schwertmannite remains elusive. This study indicates that schwertmannite could be formed on the montmorillonite surface during the photocatalytic oxidation of dissolved Fe(II). The formation rate, particle size, and crystallinity degree of schwertmannite formed on montmorillonite surface increased with increasing FeSO4 concentration (1.0–5.0 mmol L–1). The presence of montmorillonite led to a decrease in the particle size of schwertmannite. When the initial concentration of Fe(II) was 5.0 mmol L–1, the specific surface area of schwertmannite–montmorillonite aggregates reached 243.3 m2 g–1, which was remarkably larger than that of single-phase schwertmannite (24.6 m2 g–1) and montmorillonite (138.1 m2 g–1). The schwertmannite–montmorillonite aggregates showed a higher adsorption capacity for Cr(VI) (97.4 mg Cr g–1 Fe) than single-phase schwertmannite (72.9 mg Cr g–1 Fe). This work reveals the possible formation pathway and Cr adsorption behavior of schwertmannite on the surface of montmorillonite in waters and soils.

KeywordSolar Irradiation no3− Schwertmannite montmorillonite adsorption cr(Vi)
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10879
Collection环境地球化学国家重点实验室
Affiliation1.† Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricult
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Recommended Citation
GB/T 7714
Zhipeng Shu,Lihu Liu,Guohong Qiu,et al. Photochemical Formation Process of Schwertmannite on Montmorillonite and Corresponding Cr(VI) Adsorption Capacity[J]. ACS Earth and Space Chemistry,2019,3(5):718-727.
APA Zhipeng Shu.,Lihu Liu.,Guohong Qiu.,Xiong Yang.,Mingzhe Zhang.,...&Fei Wu.(2019).Photochemical Formation Process of Schwertmannite on Montmorillonite and Corresponding Cr(VI) Adsorption Capacity.ACS Earth and Space Chemistry,3(5),718-727.
MLA Zhipeng Shu,et al."Photochemical Formation Process of Schwertmannite on Montmorillonite and Corresponding Cr(VI) Adsorption Capacity".ACS Earth and Space Chemistry 3.5(2019):718-727.
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