Inhibitory effect of formate on oxidation of Cr(III) under UV irradiation

WANG Zhaohui; XIAO Dongxue; LIU Renlan; LIU Jianshe

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Inhibitory effect of formate on oxidation of Cr(III) under UV irradiation

WANG Zhaohui * #,XIAO Dongxue,LIU Renlan,LIU Jianshe

College of Environmental Science and Engineering, Donghua University, Shanghai 201620

*Correspondence author

#Submitted by

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Funding: Research Fund for the Doctoral Program of Higher Education of China （No.No. 20100075120010) and the Fundamental Research Funds for the Central Universities）

Opened online:24 December 2013

Accepted by: none

Citation: WANG Zhaohui,XIAO Dongxue,LIU Renlan.Inhibitory effect of formate on oxidation of Cr(III) under UV irradiation[OL]. [24 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4575806

The oxidation processes of Cr(III) to Cr(VI) are not well understood, although the reduction of Cr(VI) has been extensively investigated. Here the effects of the small organic acid, formic acid, on the iron-catalyzed photo-oxidation of Cr(III) were examined. The concentrations of Cr(VI), Fe(II) and H2O2 were monitored to elucidate the reaction mechanisms. In the absence of formate, Cr(III) can be readily oxidized to Cr(VI) by photogenerated oOH from photolysis of ferric hydroxyl complex. The presence of formate diminished the production of Cr(VI) due to its strong radical scavenging capacity for oOH and potential re-reduction of Cr(VI) by its secondary reducing CO2o- radical. However, the yield of CO2o- may be very low because of the much lower quantum yield of oOH in UV/Fe(III) systems. The present study has important implication for understanding the redox chemistry of chromium species in carbon-rich aquatic environment.

Keywords:environmental science; iron cycling; redox; photochemistry

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