Preparation and Synergistic Catalytic Performance of Ag/TiO2 Composite Photocatalysts Modified by Acetic Acid

doi:10.7503/cjcu20160809

Abstract

Abstract:

Ag/TiO₂ sample was prepared by photochemical reduction approach, and then the sample was impregnated with acetic acid to obtain the HAc-Ag/TiO₂ composite photocatalysts. The samples were characterized by transmission electron microscopy(TEM), X-ray diffraction(XRD), UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS), X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared(FTIR) spectroscopy. The visible light photocatalytic degradation of methyl orange(MO) in an aqueous solution was used as a probe reaction to evaluate the photocatalytic activity of the obtained samples. It reveals that the modifying of acetic acid can obviously narrow the bandgap of TiO₂ via the formation of band tail in the bandgap of TiO₂. Especially, the co-modification of Ag and acetic acid resulted in more narrow TiO₂ bandgap and more positive top of valence band. The synergistic effects of Ag and acetic acid on TiO₂ enhanced the photocatalyst performance of HAc-Ag/TiO₂ composite. Under visible light irradiation, nearly 100% of MO was degraded within 2 h on the HAc-Ag/TiO₂ photocatalyst.

Key words: TiO₂, Ag nanoparticles, Acetic acid modifying, Visible-light photocatalysis

CLC Number:

O643

TrendMD:

A Shan, ZHEN Jiawei, LIU Juming, BAI Jie, YANG Jucai, ZHANG Qiancheng. Preparation and Synergistic Catalytic Performance of Ag/TiO₂ Composite Photocatalysts Modified by Acetic Acid[J]. Chem. J. Chinese Universities, 2017, 38(8): 1450.

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Preparation and Synergistic Catalytic Performance of Ag/TiO₂ Composite Photocatalysts Modified by Acetic Acid

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