Journal
APPLIED SURFACE SCIENCE
Volume 471, Issue -, Pages 912-920Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.12.079
Keywords
Cr(VI); BPA; Solar photocatalysis; Dopamine; Carbon felt cathode; BiVO4 photoanode
Categories
Funding
- National Nature Science Foundation of China [21777106, 51708356]
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07202]
- China Postdoctoral Science Foundation [2017M612749]
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In this work, a carbon felt cathode modified by dopamine (DPA/CF) was explored to enhance the cathodic reduction of Cr(VI) in a two chambers photoelectrochemical system, which was driven by solar light irradiation using BiVO4 photoanode. In the anode chamber, the bisphenol A (BPA) decomposition can be significantly improved by increasing pH to 8. The electron-hole pairs photogenerated on the surface of BiVO4 were efficiently separated by the application of the DPA/CF cathode. At the optimal conditions, 86% of low-concentration BPA was removed within 60 min. In the cathodic chamber, 80% of Cr(VI) was removed at pH of 4. Based on the XPS and electrochemical analyses, it was proposed that the positively-charged groups on the DPA/CF cathode led to the multilayer adsorption of Cr(VI) anions, which enhanced the reduction of Cr(VI) with the electrons generated on the BiVO4. On the other hand, the C-O groups on the DPA/CF electrode also played an important role as electron transfer mediator for Cr(VI) reduction. The prepared DPA/CF cathode associated with BiVO4 photo-anode could be a potential application for efficient removal of Cr(VI) and organic pollutants under solar light irritation.
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