Elucidation of the mechanism of reaction between S2O 82-, selenite and Mn2+ in aqueous solution and limestone-gypsum FGD liquor

Hiroyuki Akiho; Shigeo Ito; Hiromitsu Matsuda; Toshiaki Yoshioka

doi:10.1021/es3042302

Elucidation of the mechanism of reaction between S₂O ₈^2-, selenite and Mn²⁺ in aqueous solution and limestone-gypsum FGD liquor

Hiroyuki Akiho, Shigeo Ito, Hiromitsu Matsuda, Toshiaki Yoshioka

ENV - Frontier Science for Advanced Environment

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

The mechanism of reaction between peroxodisulfate ion (S₂O ₈^2-), selenite (Se(IV)O₃^2-) and Mn²⁺ as an inhibitor of selenite oxidation was studied using aqueous solutions composed of commercial reagents, as well as limestone-gypsum flue gas desulfurization (FGD) liquors sampled from coal fired power plants. The oxidation of selenite to selenate (Se(VI)O₄^2-) is promoted by the sulfate ion radical (SO₄^-) which results from decomposition of S₂O₈^2-. In the presence of Mn²⁺, selenite oxidation was prevented due to the difference in rates of reaction with SO₄^-. The ratio of the oxidation rate constants of selenite and Mn²⁺ with SO₄^- was determined over a temperature range of 40-60 C, and was found to be little influenced by the various coexisting components in FGD liquors.

Original language	English
Pages (from-to)	11311-11317
Number of pages	7
Journal	Environmental Science & Technology
Volume	47
Issue number	19
DOIs	https://doi.org/10.1021/es3042302
Publication status	Published - 2013 Oct 1

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abstract = "The mechanism of reaction between peroxodisulfate ion (S2O 82-), selenite (Se(IV)O32-) and Mn2+ as an inhibitor of selenite oxidation was studied using aqueous solutions composed of commercial reagents, as well as limestone-gypsum flue gas desulfurization (FGD) liquors sampled from coal fired power plants. The oxidation of selenite to selenate (Se(VI)O42-) is promoted by the sulfate ion radical (SO4-) which results from decomposition of S2O82-. In the presence of Mn2+, selenite oxidation was prevented due to the difference in rates of reaction with SO4-. The ratio of the oxidation rate constants of selenite and Mn2+ with SO4- was determined over a temperature range of 40-60 C, and was found to be little influenced by the various coexisting components in FGD liquors.",

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AU - Akiho, Hiroyuki

AU - Ito, Shigeo

AU - Matsuda, Hiromitsu

AU - Yoshioka, Toshiaki

PY - 2013/10/1

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N2 - The mechanism of reaction between peroxodisulfate ion (S2O 82-), selenite (Se(IV)O32-) and Mn2+ as an inhibitor of selenite oxidation was studied using aqueous solutions composed of commercial reagents, as well as limestone-gypsum flue gas desulfurization (FGD) liquors sampled from coal fired power plants. The oxidation of selenite to selenate (Se(VI)O42-) is promoted by the sulfate ion radical (SO4-) which results from decomposition of S2O82-. In the presence of Mn2+, selenite oxidation was prevented due to the difference in rates of reaction with SO4-. The ratio of the oxidation rate constants of selenite and Mn2+ with SO4- was determined over a temperature range of 40-60 C, and was found to be little influenced by the various coexisting components in FGD liquors.

AB - The mechanism of reaction between peroxodisulfate ion (S2O 82-), selenite (Se(IV)O32-) and Mn2+ as an inhibitor of selenite oxidation was studied using aqueous solutions composed of commercial reagents, as well as limestone-gypsum flue gas desulfurization (FGD) liquors sampled from coal fired power plants. The oxidation of selenite to selenate (Se(VI)O42-) is promoted by the sulfate ion radical (SO4-) which results from decomposition of S2O82-. In the presence of Mn2+, selenite oxidation was prevented due to the difference in rates of reaction with SO4-. The ratio of the oxidation rate constants of selenite and Mn2+ with SO4- was determined over a temperature range of 40-60 C, and was found to be little influenced by the various coexisting components in FGD liquors.

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Elucidation of the mechanism of reaction between S₂O ₈^2-, selenite and Mn²⁺ in aqueous solution and limestone-gypsum FGD liquor

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