Photochemical Anti-Fouling Approach for Electrochemical Pollutant Degradation on Facet-Tailored TiO2 Single Crystals

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CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
Department of Municipal Engineering, Hefei University of Technology, Hefei, 230009, China
*(A.-Y.Z.) E-mail: [email protected]
*(H.-Q.Y.) E-mail: [email protected]
Cite this: Environ. Sci. Technol. 2017, 51, 19, 11326–11335
Publication Date (Web):September 11, 2017
Copyright © 2017 American Chemical Society
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Electrochemical degradation of refractory pollutants at low bias before oxygen evolution exhibits high current efficiency and low energy consumption, but its severe electrode fouling largely limits practical applications. In this work, a new antifouling strategy was developed and validated for electrochemical pollutant degradation by photochemical oxidation on facet-tailored {001}-exposed TiO2 single crystals. Electrode fouling from anodic polymers at a low bias was greatly relieved by the free ·OH-mediated photocatalysis under UV irradiation, thus efficient and stable degradation of bisphenol A, a typical environmental endocrine disrupter, and treatment of landfill leachate were accomplished without remarkable oxygen evolution in synergistic photoassisted electrochemical system. Electrochemical and spectroscopic measurements indicated a clean electrode surface during cyclic pollutant degradation. Such a photochemical antifouling strategy for low-bias anodic pollutants degradation was mainly attributed to the improved electric conductivity and excellent electrochemical and photochemical activities of tailored TiO2 anodic material, whose unique properties originated from the favorable surface atomic and electronic structures of high-energy {001} polar facet and single-crystalline structure. Our work opens up a brand new approach to develop catalytic systems for efficient degradation of refractory contaminants in water and wastewater.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.7b04105.

  • Characterizations of TiO2 SCs and P25 (Figures S–S), Sb-doped SnO2/Ti (Figures S1–S7) and Ti0.7Ru0.3O2/Ti electrodes (Figures S8–S10), additional PC, EC and PEC characterizations and BPA degradation tests (Figures S11–S13), evolution of main BPA degradation intermediates (Figures S26), light spectrum of the utilized Xe lamp (Figure S27), BPA adsorption tests (Figures S28), EC and PEC kinetic constant ratios (Figure S29), diagram of the PEC cell (Scheme S1), BPA degradation pathway (Scheme S2), the general PEC mechanism (Scheme S3), characteristics of landfill leachate (Table S1) and BPA removal behaviors under various conditions (Table S2) (PDF)

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