Removal of As(V) from wastewaters using magnetic iron oxides formed by zero-valent iron electrocoagulation

Wang, Yi; Liu, Lihu; Yang, Xiong; Suib, Steven L.; Qiu, Guohong

doi:10.1016/j.jenvman.2022.114519

Removal of As(V) from wastewaters using magnetic iron oxides formed by zero-valent iron electrocoagulation

Journal Article · Tue Jan 18 00:00:00 EST 2022 · Journal of Environmental Management

DOI:https://doi.org/10.1016/j.jenvman.2022.114519· OSTI ID:1977296

Wang, Yi ^[1]; Liu, Lihu ^[1]; Yang, Xiong ^[1]; Suib, Steven L. ^[2]; ^[1]

Huazhong Agricultural University, Wuhan (China)
University of Connecticut, Storrs, CT (United States)

Electrocoagulation of zero-valent iron has been widely applied to the removal of dissolved arsenic, but the solid-liquid separation of arsenic-containing precipitates remains technically challenging. In this work, zero-valent iron was electrochemically oxidized to magnetic iron oxides for the removal of As(V) from simulated and actual mining wastewaters. The results indicated that lepidocrocite was formed when zero-valent iron was oxidized by dissolved oxygen, but ferrihydrite and green rust were first formed and then transformed to magnetic iron oxides (mainly magnetite and maghemite) in the electrochemical oxidation from 0 to 0.9 V (vs. SCE), which facilitates the adsorption of As(V) and subsequent solid-liquid separation under a magnetic field. In simulated As(V)-containing solution with initial pH 7.0, zero-valent iron was electrochemically oxidized to magnetite and maghemite at 0.6 V (vs. SCE) for 2 h. The As(V) concentration first decreased from 5127.5 to 26.8 μg L^-1 with a removal ratio of 99.5%. In actual mining wastewaters, zero-valent iron was electrochemically oxidized to maghemite at 0.6 V (vs. SCE) for 24 h, and the As(V) concentration decreased from 5486.4 to 3.6 μg L^-1 with a removal ratio of 99.9%. The removal ratio of As(V) increased slightly with increasing potential, and increased first and then decreased with increasing initial pH. Compared with that of SO₄^2- and NO₃^-, the presence of Cl^- significantly enhanced the removal of As(V). This work provides a highly efficient, facile and low-cost technique for the treatment of arsenic-containing wastewaters.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Connecticut, Storrs, CT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); National Natural Science Foundation of China (NSFC); China Postdoctoral Science Foundation; National Key Research and Development Program of China; Central Universities

Grant/Contract Number:: FG02-86ER13622; 42007127; 42077133; 41877025; BX20200144; 2021M691163; 2020YFC1808503; 2662018JC055; 2662015JQ002

OSTI ID:: 1977296

Journal Information:: Journal of Environmental Management, Vol. 307, Issue C; ISSN 0301-4797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
arsenic
electrocoagulation
zero-valent iron
magnetic iron oxides
wastewater

Removal of As(V) from wastewaters using magnetic iron oxides formed by zero-valent iron electrocoagulation

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