Selective oxidation of arsenite by peroxymonosulfate with high utilization efficiency of oxidant

Zhaohui Wang, Richard T. Bush, Leigh A. Sullivan, Chuncheng Chen, Jianshe Liu

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Oxidation of arsenite (As(III)) is a critical yet often weak link in many current technologies for remediating contaminated groundwater. We report a novel, efficient oxidation reaction for As(III) conversion to As(V) using commercial available peroxymonosulfate (PMS). As(III) is rapidly oxidized by PMS with a utilization efficiency larger than 90%. Increasing PMS concentrations and pH accelerate oxidation of As(III), independent to the availability of dissolved oxygen the addition of PMS enables As(III) to oxidize completely to As(V) within 24 h, even in the presence of high concentrations of radical scavengers. On the basis of these observations and theoretical calculations, a two-electron transfer (i.e., oxygen atom transfer) reaction pathway is proposed. Direct oxidation of As(III) by PMS avoids the formation of nonselective reactive radicals, thus minimizing the adverse impact of coexisting organic matter and maximizing the utilization efficiency of PMS therefore, this simple approach is considered a cost-effective water treatment method for the oxidation of As(III) to As(V).

Original languageEnglish
Pages (from-to)3978-3985
Number of pages8
JournalEnvironmental Science and Technology
Volume48
Issue number7
DOIs
Publication statusPublished - 1 Apr 2014
Externally publishedYes

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