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| The behaviors of photoinduced electrons on the degradation of the p-benzoquinone in TiO2 based photoelectrocatalytic process |
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Abstract Photoinduced electrons were formed by transferring from the TiO2/Ti thin film anode to the cathode under an anode bias potential supply. In this paper, the chemical behaviors of as formed photoinduced electrons were investigated in the cathodic solution, and the generated reactive oxygen species were identified by a spectrophotometric method using salicylic acid as the molecular probe. Additionally, the effects of initial pH, constant current value, and ion exchange membrane on the p-benzoquinone degradation efficiency of cathode compartment were also investigated, respectively. Experimental results shows that H2O2 and ·OH could be gradually formed by reduction from between the dissolved oxygen and as-formed photoinduced electrons under an acid condition. The degradation of p-benzoquinone could reach 82.3% within 60min under the following optimum conditions: the initial pH=2.0, constant current value=3.5 mA, and using a cation membrane as the connected model between anode and cathode compartment.
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Received: 25 September 2014
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