Photoelectro Degradation of Rhodamine B on Co-Doped TiO₂ Films under Visible Light

Abstract:

In a single photoreactor, the degradation of rhodamine B (RhB) was studied on TiO₂ and Co-doped TiO₂ (Co-TiO₂) films under visible light. The results show that the degradation rate of RhB by photocatalytic (PC) and photosensitization (PS) on Co-TiO₂ films is quicker than that by PS degradation on TiO₂ film. However, a fast N-de-ethylation leads to the increase in degradation rate unsatisfactory. When a bias potential was applied onto Co-TiO₂ films, the degradation rate of RhB greatly increased. This can be attributed to the generation of more hydroxyl radicals on Co-TiO₂ anodes and cathode. These OH⋅ radicals attack the chromophoric structure of RhB. In addition, with the bias potential application, the optimal Co²⁺ dopant concentration increases from 0.02 % to 0.4%.

• Periodical: Applied Mechanics and Materials (Volume 723)
• Pages: 619-623
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.723.619
• Online since: January 2015
• Authors: Feng Zhu, Jiang Lin Cao*, Ning Duan
• Keywords: Co-Doped Tio₂, Photodegradation, Rhodamine B, Thin Film, Visible Light

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