Production and contribution of hydroxyl radicals between the DSA anode and
water interface |
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Authors: | Guoting Li Meiya Zhu Jing Chen Yunxia Li and Xiwang Zhang |
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Institution: | 1. Department of Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou 450011,China 2. School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore |
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Abstract: | Hydroxyl radicals play the key role during electrochemical oxidation and photoelectrochemical oxidation. The production and e ect
of hydroxyl radicals on the interface between DSA anode and water was investigated by examining the quenching e ect of iso-propanol
on Orange II decolorization. We observed that with an increase in electrode potential from 4 to 12 V across electrodes at pH 7.0, the
contribution percentage of hydroxyl radicals increased dramatically. More OH radicals were produced in acidic and alkaline conditions
than at neutral conditions. At electrode potential of 4 V, the contribution percentage of hydroxyl radicals was obviously higher at near
neutral pH conditions, while removal e ciency of Orange II achieved was the lowest concurrently. Finally, for photocatalytic oxidation,
electrochemical oxidation, and photoelectrochemical oxidation using the same DSA electrode, the e ect of hydroxyl radicals proved
to be dominant in photocatalytic oxidation but the contribution of hydroxyl radicals was not dominant in electrochemical oxidation,
which implies the necessity of UV irradiation for electrochemical oxidation during water treatment. |
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Keywords: | hydroxyl radicals DSA electrode photoelectrocatalysis Orange II |
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