Screening Effect of Phosphate on Photoelectrocatalytic Activity of TiO₂ Electrode

Abstract:

Although the effect of phosphate on photocatalytic activity of TiO₂ is extensively investigated, its effect on the photoelectrocatalytic activity of TiO₂ electrode is not clear. The effect of phosphate on photoelectrocatalytic oxidation of water and organics on the TiO₂ electrode were investigated in this study. Phosphate has a sophisticated influence on the photoelectrocatalytic oxidation of water on TiO₂ electrode. The photoelectrocatalytic oxidation of water was inhibited at the low phosphate concentration (<5 μM) while improved at the high concentration. However, phosphate has an adverse influence on the photoelectrocatalytic oxidation of whether the strong or not the weak adsorption organics on the TiO₂ electrode, which is different from its effect on photocatalytic process of organics on the TiO₂ slurry, in which the photocatalytic oxidation of the weak adsorption organics is enhanced. However, phosphate can improve the linear concentration range of organics, especially strong adsorption organics (e.g. KHP, 0-333 μM for without phosphate to 0-500 μM for the with 1 M phosphate). Moreover, it is unanimously consent that phosphate has a very strong acid-base buffer capacity. These properties provide an excellent potential for phosphate application during the detection of practical samples, especially the acid and/or base samples.

• Periodical: Advanced Materials Research (Volumes 953-954)
• Pages: 1099-1104
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.953-954.1099
• Online since: June 2014
• Authors: Yan He Han, Jia Qing Chen
• Keywords: Phosphate, Photoelectrocatalysis, Screening Effect, TiO₂

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