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

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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.

Key words： reverse photocatalysis light transmittance of water film preparation parameters comparisons of forward and reverse systems

Received: 08 February 2023

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X703

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	Articles by authors
	ZHANG Xun-zhi
	LU Jin-suo
	ZHANG Zhi-qiang
	YANG Jing
	PANG He-liang

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ZHANG Xun-zhi,LU Jin-suo,ZHANG Zhi-qiang等. Construction and efficiency analysis of reverse photocatalytic oxidation system: a novel pattern to overcome bottleneck of light attenuation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4568-4577.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4568

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