Bicarbonate promotes the oxidation of As(III) by S(IV)-Mn(II) system

Abstract Advanced oxidation processes based on sulfite [S(IV)] have attracted more and more attention due to their low-cost advantages. In this study, we investigated the oxidation effect and mechanism of As(III) in high-arsenic groundwater in the presence of bicarbonate (HCO^-₃) by the Mn(II)-activated S(IV) system. The results showed that HCO^-₃ significantly promoted the oxidation of As(III) in the S(IV)-Mn(II) system. Kinetic experiments showed that increasing concentrations of S(IV) and Mn(II) promoted the oxidation of As(III), but too high concentrations inhibited the oxidation process. The effect of pH on the oxidation of As(III) due to the species changes of S(IV) and Mn(II) in the reaction solution. The promotion effect of HCO^-₃ on the oxidation of As(III) may due to two aspects: (1) it formed weak coordination with Mn(II), which was helpful for the combination of S(IV) and Mn(II); (2) it promoted the oxidation of Mn(II) to Mn(III), which was favorable for the formation of SO^·-₄. Quenching experiments revealed that SO^·-₄ was the primarily reactive oxygen species in the oxidation of As(III). This study enhances the understanding of the S(IV)-HCO^-₃-Mn(II) system and provides a new solution for the treatment of high arsenic water.

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	CAO Min
	MENG Zihe
	SONG Baodong
	WU Songhai
	HAN Xu

Keywords： As(III) oxidation sulfite bicarbonate

Received 2022-02-17;

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CAO Min, MENG Zihe, SONG Baodong, WU Songhai, HAN Xu.Bicarbonate promotes the oxidation of As(III) by S(IV)-Mn(II) system[J] Chemcial Industry and Engineering, 2024,V41(4): 88-96

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