Preparation and Characterization of Cu Doped TiO2 Nanoparticles and Their Photocatalytic Activity

Abstract

Abstract: In this work,pure and Cu doped TiO₂ nanoparticles with different molar fractions of Cu were prepared by a sol-gel process,and were characterized by means of XRD,TG-DTA,XPS,DRS and FS spectra. We mainly investigated the effects of calcining temperature and Cu content on the properties and the photocatalytic activity of as-prepared TiO₂ samples,and also discussed the relationships between FS spectra and photocatalytic activity as well as the mechanisms of Cu doping on TiO₂ phase transformation. The results showed that Cu²⁺ dopant greatly promoted TiO₂ phase transformation,and made the optic response range of TiO₂ nanoparticles expand to the visual light,Cu dopant did not give rise to new FS phenomena,but it could make the FS intensity decrease with an appropriate Cu content. Moreover,in the experiment of photocatalytic degradation phenol,Cu doped TiO₂ nanoparticles calcined at 500 ℃ exhibited a higher photocatalytic activity,corresponding to the characterization results. The order of photocatalytic activity of Cu doped TiO₂ samples with different molar fractions of Cu was opposite to the orders of their PL intensity,namely,the weaker the PL intensity,the higher the photocatalytic activity. This could be explained by the points that the dopant Cu²⁺ could capture photoinduced electrons not only to make the FS intensity decrease during the process of photoluminescence but also to promote the oxidation of organic pollutants during the process of photocatalytic reaction.

Key words: TiO₂, Doping, Cu, Fluorescence spectrum, Photocatalysis

CLC Number:

O643

TrendMD:

XIN Bai-Fu, JING Li-Qiang, FU Hong-Gang, SUN Zhi-Hua, REN Zhi-Yu, WANG Bai-Qi, CAI Wei-Min. Preparation and Characterization of Cu Doped TiO₂ Nanoparticles and Their Photocatalytic Activity[J]. Chem. J. Chinese Universities, 2004, 25(6): 1076.

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Preparation and Characterization of Cu Doped TiO₂ Nanoparticles and Their Photocatalytic Activity

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