青岛科技大学  English 
王志义
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教授 硕士生导师  

教师拼音名称:Wang Zhiyi

学历:博士研究生

学位:工学博士

职称:教授

毕业院校:中国海洋大学

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Effect of SiO<inf>2</inf>on thermal stability and photocatalytic activity of SiO<inf>2</inf>/TiO<inf>2</inf> films

摘要:SiO<inf>2</inf>/TiO<inf>2</inf> sols were prepared via a novel sol-gel process using TiCl<inf>4</inf> and industrial SiO<inf>2</inf> sol as starting material precursors. A series of SiO<inf>2</inf>/TiO<inf>2</inf> composite films were formed via a dip-coating route on ceramic substrates precoated with 4 layers of Al<inf>2</inf>O<inf>3</inf> films, and characterized using an X-ray diffractometer (XRD), a field-emission scanning electron microscope (FE-SEM) and a Fourier transform infrared (FT-IR) spectrometer. The effect of SiO<inf>2</inf> on the anatase-rutile phase transformation in the films was also examined. The results showed that the presence of SiO<inf>2</inf> greatly retarded the anatase-rutile transformation and inhibited the grain growth of TiO<inf>2</inf>. The anatase-rutile transformation temperature increased from 700°C (in the case of pure TiO<inf>2</inf>) to 1000°C (in the case of using 10 mol% SiO<inf>2</inf>). The average crystalline size of TiO<inf>2</inf> in the films after calcination at 1000°C was about 28 nm. The photocatalytic activities of the films were evaluated based on degradation rates of a methylene blue solution under UV irradiation, and the results revealed that double layered SiO<inf>2</inf>/TiO<inf>2</inf> composite films calcined at 700°C exhibited the highest photocatalytic BV activity. Copyright © 2015 American Scientific Publishers All rights reserved.

卷号:7

期号:4

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