Pr3+掺杂的TiO2纳米粉体的表面特性和光催化活性

doi:10.7517/j.issn.1674-0475.2006.04.276

影像科学与光化学 ›› 2006, Vol. 24 ›› Issue (4): 276-285.DOI: 10.7517/j.issn.1674-0475.2006.04.276

Pr³⁺掺杂的TiO₂纳米粉体的表面特性和光催化活性

姜洪泉^1,2, 王鹏¹, 陈红艳², 于凯²

1. 哈尔滨工业大学, 市政环境工程学院, 绿色化学与技术研究中心, 黑龙江, 哈尔滨, 150090;
2. 哈尔滨师范大学, 化学系, 黑龙江, 哈尔滨, 150500

收稿日期:2006-03-07 修回日期:2006-04-25 出版日期:2006-07-23 发布日期:2006-07-23
通讯作者: 王鹏, 教授, 博导, 环境工程专业, 研究领域:环境纳米技术, Tel:0451-86283801.

Surface Properties and Photocatalytic Activity of Pr³⁺-Doped TiO₂ Nano-Powders

JIANG Hong-quan^1,2, WANG Peng¹, CHEN Hong-yan², YU Kai²

1. Research Center for Green Chemistry and Technology, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, P.R. China;
2. Department of Chemistry, Harbin Normal University, Harbin 150500, Heilongjiang, P.R. China

Received:2006-03-07 Revised:2006-04-25 Online:2006-07-23 Published:2006-07-23

摘要/Abstract

摘要： 利用酸催化的溶胶-凝胶法制备了纯的和不同Pr³⁺掺杂量的TiO₂纳米粉体.以亚甲基蓝(MB)溶液的光催化降解为探针反应,评价了它们的光催化活性.利用XRD和BET技术研究了Pr³⁺掺杂量和焙烧温度对TiO₂纳米粉体的相结构、晶粒尺寸和表面织构特性的影响,并用XPS和SPS技术研究了Pr³⁺掺杂的TiO₂纳米粉体的表面组成和表面光伏特性,探讨了Pr³⁺掺杂提高纳米TiO₂的光催化活性的机制.结果表明:适量Pr³⁺掺杂能显著提高纳米TiO₂的光催化活性.当Pr³⁺掺杂量为1.25%(以Pr³⁺/TiO₂质量比计),焙烧温度为600℃时,制得粉体的光催化活性最佳.Pr³⁺掺杂强烈地抑制TiO₂由锐钛矿相向金红石相的转变,减小晶粒尺寸,增大比表面积,增加表面羟基和吸附氧的含量,提高光生电子和空穴的分离效率,改善粉体表面的光吸收性能,上述因素均有利于光催化活性的提高.

关键词: 纳米TiO₂, Pr³⁺掺杂, 表面特性, 光催化活性

Abstract: Pure and Pr³⁺-doped TiO₂ nano-powders with different doping contents were prepared by an acid-catalyzed sol-gel method using Ti(OC₄H₉)₄ and Pr(NO₃)₃ as precursors and characterized by XRD,BET,XPS and SPS techniques.The effects of Pr³⁺-doping content and calcination temperature on the photocatalytic activity for photocatalytic degradation of methylene blue(MB) in aqueous solution,phase structure,crystallite size and surface texture properties of the nano-powders were investigated.The surface composition and surface photovoltaic properties of the nano-particles were also studied.The mechanism of enhancement in their photocatalytic activity was also discussed.The results indicate that Pr³⁺-doping can enhance the photocatalytic activity of TiO₂ nano-powders as compared with pure TiO₂.1.25% Pr³⁺-doped TiO₂ nano-powders calcined at 600 ℃ for 2 h show the highest photocatalytic activity.The presence of Pr³⁺ in TiO₂ can strongly inhibit the phase transformation from anatase to rutile,and reduce crystallite size,and enlarge specific surface area,and increase the contents of both surface hydroxyl groups and adsorbed oxygen,and enhance separation efficiency of photo-generated electron-hole pairs,and improve the light adsorption properties of the particle surface as well,which result in the enhancement in the photocatalytic activity.

Key words: nano-sized titania, Pr³⁺-doping, surface property, photocatalytic activity

中图分类号:

O643

姜洪泉, 王鹏, 陈红艳, 于凯. Pr³⁺掺杂的TiO₂纳米粉体的表面特性和光催化活性[J]. 影像科学与光化学, 2006, 24(4): 276-285.

JIANG Hong-quan, WANG Peng, CHEN Hong-yan, YU Kai. Surface Properties and Photocatalytic Activity of Pr³⁺-Doped TiO₂ Nano-Powders[J]. Imaging Science and Photochemistry, 2006, 24(4): 276-285.

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Pr³⁺掺杂的TiO₂纳米粉体的表面特性和光催化活性

Surface Properties and Photocatalytic Activity of Pr³⁺-Doped TiO₂ Nano-Powders

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