TiO2纳米粒子膜的表面态性质及其光催化活性的研究

doi:10.7517/j.issn.1674-0475.1999.02.100

影像科学与光化学 ›› 1999, Vol. 17 ›› Issue (2): 100-103.DOI: 10.7517/j.issn.1674-0475.1999.02.100

TiO₂纳米粒子膜的表面态性质及其光催化活性的研究

曹亚安¹, 陈咏梅², 管自生¹, 马颖¹, 吴志芸², 白玉白², 李铁津², 姚建年¹

1. 中国科学院感光化学研究所北京100101;
2. 吉林大学化学系长春130023

收稿日期:1999-02-02 修回日期:1999-02-09 出版日期:1999-05-20 发布日期:1999-05-20
通讯作者: 姚建年
基金资助:
国家自然科学基金项目(批准号:59620167);中科院重大基础研究项目

RELATIONSHIP OF PHOTOCATALYTIC ACTIVITY AND SURFACE STATES OF TiO₂ NANOPARTICLE FILM

CAO Ya-an¹, CHEN Yong-mei², GUAN Zi-sheng¹, MA Ying¹, WU Zhi-yun², BAI Yu-bai², LI Tie-jin², YAO Jian-nian¹

1. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P. R. China;
2. Department of Chemistry, Jilin University, Changchun 130023, P. R. China

Received:1999-02-02 Revised:1999-02-09 Online:1999-05-20 Published:1999-05-20

摘要/Abstract

摘要： TiO₂纳米粒子膜催化剂光催化降解水中污染物,与粉末相比具有可重复使用、易回收等优点,近年来,在光化学领域受到人们的高度重视^[1～3].膜催化剂的表面性质与其光催化活性直接相关,研究这些性质能够为研制、开发高效催化剂提供理论依据.本文采用TiCl₄水解法,制备了酸性、碱性条件下TiO₂纳米粒子膜.利用原子力显微镜(AFM)、X-射线衍射谱(XRD)、红外光谱(IR)和场诱导表面光电压谱(EFISPS)测定其表面微结构.考察了它们对苯酚降解的光催化活性,讨论了膜催化剂的表面性质对光催化活性的影响.

关键词: TiO₂纳米粒子膜, 表面态, 光催化活性

Abstract: TiO₂ nanoparticle film catalysts have been prepared in acid and basic conditions respectively, by method of the hydrolysis of TiCl₄. Their surface microstructures and surface energy levels were tested by infrared (IR) spectra and electrical field induced surface photovoltage spectra (EFISPS). The results demonstrate that surface properties of the two kinds of TiO₂ films are different. A new peak at 1350 cm^-1 due to superoxide radical appears in the IR spectrum of TiO₂ powder prepared by basic condition, while it is not found in the one prepared by acidic condition. Furthermore, a new peak at 390nm attributed to Ti³⁺ surface state is also found in EFISPS of the film obtained from basic colloid, whereas the peak disappears in EFISPS of the film obtained from acidic colloid. Photodegradation of phenol shows that photocatalytic activity is affected by surface properties of the film. Photocatalytic activity of the latter is better than that of the former confirms that Ti³⁺ reduces photocatalytic activity of catalyst.

Key words: TiO₂ nanoparticle film, surface state, photocatalytic activity

曹亚安, 陈咏梅, 管自生, 马颖, 吴志芸, 白玉白, 李铁津, 姚建年. TiO₂纳米粒子膜的表面态性质及其光催化活性的研究[J]. 影像科学与光化学, 1999, 17(2): 100-103.

CAO Ya-an, CHEN Yong-mei, GUAN Zi-sheng, MA Ying, WU Zhi-yun, BAI Yu-bai, LI Tie-jin, YAO Jian-nian. RELATIONSHIP OF PHOTOCATALYTIC ACTIVITY AND SURFACE STATES OF TiO₂ NANOPARTICLE FILM[J]. Imaging Science and Photochemistry, 1999, 17(2): 100-103.

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TiO₂纳米粒子膜的表面态性质及其光催化活性的研究

RELATIONSHIP OF PHOTOCATALYTIC ACTIVITY AND SURFACE STATES OF TiO₂ NANOPARTICLE FILM

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