Small amount of TiO 2 modified SnO 2 with enhanced photocatalytic performance toward the removal of rhodamine B

Micro & nano letters

article

Yi Zhang¹  Hu Yang¹  Wei Zou¹ 

[1] Key Laboratory of Fine Chemical Additives and Surfactants of Sichuan Institutes of High Education, College of Chemistry Engineering, Sichuan University of Science and Engineering

关键词: electron-hole recombination;    photoelectrochemistry;    dyes;    tin compounds;    visible spectra;    ultraviolet spectra;    titanium compounds;    surface photovoltage;    photocatalysis;    photocatalysts;    surface chemistry;    semiconductor materials;    semiconductor growth;    crystal growth from solution;    water pollution control;    water treatment;    composite materials;    photogenerated electron-hole pairs;    TiO2–SnO2 composite photocatalysts;    rhodamine B;    toxic organic pollutants;    high recombination rates;    hydrothermal method;    ultraviolet–visible-diffuse reflectance spectra;    UV light absorption ability;    surface photovoltage spectroscopy;    photoelectrochemistry;    UV irradiation illumination;    TiO2-SnO2;   

DOI  :  10.1049/mnl.2020.0320

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Tin dioxide (SnO 2 ) photocatalyst has broad prospects for the degradation of toxic organic pollutants; however, its practical application is greatly hampered by poor activity due to the high recombination rates of photogenerated electron-hole pairs. In this work, titania (TiO 2 ) modified SnO 2 photocatalysts were obtained by a facile hydrothermal method to suppress the rapid recombination of photogenerated electron-hole pairs and improve the photocatalytic activity. Ultraviolet–visible (UV–vis)_ diffuse reflectance spectra suggest that TiO 2 –SnO 2 composite photocatalysts hold stronger UV light absorption ability than that of the pure SnO 2 . Surface photovoltage spectroscopy and photoelectrochemistry results show that the separation rate of photogenerated charge pairs of TiO 2 –SnO 2 photocatalysts was greatly enhanced. The photocatalytic activities of the photocatalysts were evaluated by the decay of rhodamine B (RhB) under UV irradiation illumination. The results display that modification of SnO 2 by TiO 2 can largely enhance the photocatalytic activity and the photocatalytic performance of 0.5:1-TS sample is nearly 5 times that of the pure SnO 2 . Moreover, maintaining the ratio of TiO 2 and SnO 2 at 0.5:1, the amount of catalyst was 30 mg, the concentration of dye was 10 mg/l, and the pH of RhB solution was 2, the sample has the best photocatalytic activity.

【 授权许可】

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