Peroxymonosulfate improves the activity and stability of manganese oxide for oxidation of arsenite to arsenate

Liu, Y., Zhang, F., Hou, J. and Hartley, W. (2019) Peroxymonosulfate improves the activity and stability of manganese oxide for oxidation of arsenite to arsenate. CLEAN – Soil, Air, Water.

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Abstract

Manganese oxide has been widely investigated for oxidation of arsenite (As(III)) to arsenate (As(V)) due to its high redox potential, however it becomes extremely unstable after reuse. Here, As(III) oxidation activity and stability of manganese oxide in the presence of peroxymonosulfate (PMS) was investigated. Batch experimental results revealed that manganese oxide/PMS exhibits high catalytic activity for As(III) oxidation compared to manganese oxide or PMS alone. Addition of PMS to manganese oxide not only revealed long‐term stability for As(III) oxidation, but also showed high As(III) oxidation activity in the presence of coexisting ions such as As(V) and phosphate. Quenching tests revealed that As(III) oxidation in the manganese oxide/PMS system was attributed to activation of PMS by manganese oxide at different oxidation states (Mn(III) and Mn(IV)), and the generation of sulfate radicals that were responsible for As(III) oxidation.

Item Type: Article
Keywords: Activation, Arsenite oxidation, Manganese oxide, Peroxymonosulfate, Sulfate radicals
Divisions: Crop and Environment Sciences
Depositing User: Ms Kath Osborn
Date Deposited: 18 Dec 2019 12:33
Last Modified: 18 Dec 2019 12:33
URI: http://hau.repository.guildhe.ac.uk/id/eprint/17484

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