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Catalysts 2017, 7(11), 346; doi:10.3390/catal7110346

Efficient Degradation of Refractory Organics Using Sulfate Radicals Generated Directly from WO3 Photoelectrode and the Catalytic Reaction of Sulfate

1
School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, China
2
Key Laboratory of Thin Film and Microfabrication Technology, Ministry of Education, Shanghai 200240, China
*
Authors to whom correspondence should be addressed.
Received: 12 October 2017 / Revised: 10 November 2017 / Accepted: 12 November 2017 / Published: 17 November 2017
(This article belongs to the Special Issue Advances in Electrocatalysis)
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Abstract

An environment-friendly method of efficiently degrading refractory organics using SO4• generated directly from a WO3 photoelectrode and a catalytic reaction of sulfate was proposed, in which the cycling process of SO42− → SO4• → SO42− was achieved in the treatment of organic pollutants without any other activator and without the continuous addition of sulfate. The results show that the removal efficiency for a typical refractory organics of methyl orange (MO) with 5 mg/L was up to 95% within 80 min, and merely 3% by photolysis and 19% by photocatalysis, respectively, under similar conditions. The rate constant for the disposal of MO at pH 2, in which SO4• instead of HO• is the main oxidizer confirmed by radical scavenger experiment, is up to 5.21 × 10−4 s−1, which was ~6.6 times that (7.89 × 10−5 s−1) under neutral condition, in which HO• is the main oxidizer. The concentration of active persulfate (S2O82−, SO52−, and SO4•) species at pH 2 was up to 0.38 mM, which was ~16-fold as much as that (0.023 mM) in neutral conditions. The method provides a new approach for the treatment and resource utilization of sulfate wastewater. View Full-Text
Keywords: sulfate radical; photoelectrocatalysis; WO3; refractory organics; sulfate wastewater sulfate radical; photoelectrocatalysis; WO3; refractory organics; sulfate wastewater
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Zheng, J.; Li, J.; Bai, J.; Tan, X.; Zeng, Q.; Li, L.; Zhou, B. Efficient Degradation of Refractory Organics Using Sulfate Radicals Generated Directly from WO3 Photoelectrode and the Catalytic Reaction of Sulfate. Catalysts 2017, 7, 346.

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