Abstract：The traditional photocatalytic oxidation technology was greatly limited by water translucency and light energy attenuation. In this study, a high transmittance TiO2film was prepared by liquid phase deposition method, and an innovative reverse photocatalytic oxidation system was constructed. The Rhodamine B (RhB) was employed as the targeted pollutant, and the degrading speed was used to evaluate the performance of reverse photocatalytic oxidation system. The effects of film preparation parameters and mass transfer efficiency on degradation were explored, while the comparisons between forward and reverse photocatalytic systems were expounded. Moreover, the major contributors for RhB degradation and the stability of TiO2film were clarified. It was demonstrated that the RhB degradation process in reverse photocatalytic system obeyed pseudo-first-order kinetics. The TiO2film with the optimum photocatalytic performance was obtained at the following parameters: deposition temperature at 60 ℃ for 1.5h, heat treatment at 700℃ for 1h. The reverse photocatalytic system produced numerous active species (e.g. ·OH), which dominantly contributed to pollutant degradation. The traditional forward photocatalytic system presented significant degrading performance with thin transparent liquid layer, while the reverse photocatalytic system displayed satisfactory degrading performance with the thick transparent liquid layer. Additionally, stable photocatalytic performances were observed in the reverse photocatalytic system in the case of TiO2reuse. The proposed reverse photocatalytic system has potential research and application values in the field of water treatment with poor light transmittance.
张逊之, 卢金锁, 张志强, 杨静, 庞鹤亮. 反向光催化氧化体系构建及效能研究:突破光衰减瓶颈的新途径[J]. 中国环境科学, 2023, 43(9): 4568-4577.
ZHANG Xun-zhi, LU Jin-suo, ZHANG Zhi-qiang, YANG Jing, PANG He-liang. Construction and efficiency analysis of reverse photocatalytic oxidation system: a novel pattern to overcome bottleneck of light attenuation. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4568-4577.
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