Enhancement of arsenite removal using manganese oxide coupled with iron (III) trimesic

•The oxidation of As(III) by K-OMS2 and adsorption of As(V) by Fe-BTC could simultaneously achieve greater As(III) removal.•K-OMS2 could completely oxidize As(III) to As(V) with temperature range 303–333K.•The transformed As(V) maximum adsorption capacity of Fe-BTC was 76.34mg/g, which was higher th...

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Bibliographic Details
Published in:Applied surface science 2018-01, Vol.427, p.545-552
Main Authors: Phanthasri, Jakkapop, Khamdahsag, Pummarin, Jutaporn, Panitan, Sorachoti, Kwannapat, Wantala, Kitirote, Tanboonchuy, Visanu
Format: Article
Language:English
Subjects:
Arsenate
Arsenic
Arsenite
Manganese oxide
Metal organic frameworks
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Summary:•The oxidation of As(III) by K-OMS2 and adsorption of As(V) by Fe-BTC could simultaneously achieve greater As(III) removal.•K-OMS2 could completely oxidize As(III) to As(V) with temperature range 303–333K.•The transformed As(V) maximum adsorption capacity of Fe-BTC was 76.34mg/g, which was higher than other iron based materials from previous studies.•The simultaneous As(III) removal by K-OMS2 and Fe-BTC shortened the process time compared to the case where K-OMS2 was added first, followed by the addition of Fe-BTC. A simultaneous removal of As(III) was investigated on a mixture of manganese oxide based octahedral molecular sieves (K-OMS2) and iron-benzenetricarboxylate (Fe-BTC). As(III) removal was stimulated by an oxidation cooperated with adsorption process. K-OMS2 and Fe-BTC were separately synthesized and characterized by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). K-OMS2 showed characters of pure cryptomelane phase, nanorod structure, and a mixed-valent manganese framework with the coexistence of Mn(IV) and Mn(III). As(III) was successfully oxidized to As(V) by K-OMS2 in a temperature range of 303–333K. An intermediate adsorption of As(V) was carried out with Fe-BTC in the same batch. A maximum adsorption capacity, described by Langmuir isotherm model, was observed at 76.34mg/g. With an As(III) initial concentration of 5mg/L, when K-OMS2 and Fe-BTC were simultaneously introduced into the solution, the As(III) removal process was completed within 60min. Thus, it shortened the process time compared to the case where K-OMS2 was added first, followed by the addition of Fe-BTC.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2017.09.032