F掺杂 TiO2 纳米管阵列的可见光催化活性和电子结构

doi:10.3724/SP.J.1077.2011.00369

无机材料学报 ›› 2011, Vol. 26 ›› Issue (4): 369-374.DOI: 10.3724/SP.J.1077.2011.00369

F掺杂 TiO₂ 纳米管阵列的可见光催化活性和电子结构

陈秀琴 ¹,² , 张兴旺 ¹ , 雷乐成 ¹

(1. 浙江大学工业生态与环境工程研究所 , 杭州 310027) ; (2 浙江建设职业技术学院 , 杭州 311231)

收稿日期:2010-06-28 修回日期:2010-10-12 出版日期:2011-04-20 网络出版日期:2011-04-22
作者简介:陈秀琴 (1973- ),女 ,博士 ,副教授 .
基金资助:
国家自然科学基金(20676121) ;浙江省自然科学基金 (Y507682) ;浙江省建设厅建设科技科研 (2007043) ;浙江省教育厅科研项目 (Y200909263)

Electronic Structures and Photocatalysis Properties under Visible Irradiation and of F-doped TiO₂ nanotube Nanotube arrays Arrays

CHEN Xiu-Qin¹,²,ZHANG Xing-Wang¹,LEI Le-Cheng¹

1. Institute of Industrial Ecology and Environment, Zhejiang University, Hangzhou 310027, China ; 2 . Zhejiang College of Construction, Hangzhou 311231, China

Received:2010-06-28 Revised:2010-10-12 Published:2011-04-20 Online:2011-04-22
Supported by:
National Nature Science Foundation of China (20676121) ; Natural Science Foundation of Zhejiang Province (Y507682);Scientific Research Foundation of the Construction Department of Zhejiang Province (2007043); Scientific Research Foundation of the Education Department of Zhejiang Province (Y200909263)

摘要/Abstract

摘要： 采用电化学阳极氧化法, 在纯Ti表面一步制得原位生长的F掺杂TiO₂纳米管阵列. 对煅烧后样品进行扫描电镜(SEM)、X射线多晶衍射(XRD)表征. 结果表明,所得TiO₂纳米管排列整齐、平均管径约40nm, 平均管长约700nm. XPS蚀刻分析发现, 少量F原子以F-Ti-O键的形式掺杂进了TiO₂晶格, 同时产生活性物质Ti³⁺. 可见光照射下,在0.25V(vsSCE.)外加阳极偏压下,673K煅烧后F-TiO₂具有最高瞬态光电流密度(I_ph)8.2μA/cm², 这与光电极表面的Ti³⁺有关. 进一步的电子结构分析也表明,F掺杂未明显改变TiO₂带宽.

关键词: TiO₂纳米管阵列, F掺杂, 可见光, 电子结构

Abstract: Nanosized TiO₂ has excellent photocatalytic activity to degrade most of pollutants.The most important focus has been on the improvement of photocatalytic activity and the efficiency of utilizing solar energy. The researches has proved that nonmetal-doping can activate its visible-light activity.Self-organized F-doped TiO₂ nanotube arrays were fabricated by a one-step electrochemical anodization process on a Ti sheet. The prepared samples were annealed in air and detected by SEM, XRD and XPS. SEM images The results show that the well ordered TiO₂nanotube arrays with the average tube diameter of 40 nm and the average tube length of 700 nm are successfully fabricated. The substitutional F atoms that occupied oxygen sites in the TiO ₂crystal lattice cause the appearance of active spices Ti³⁺ , as evidenced by from XPS. The sample annealed at 673 K exhibits the highest photocurrent intensities under visible light irradiation, w hich may be attributed to the Ti³⁺ .The removal efficiency reaches 37.2% of AO7 at 180 min and the photoelectrocatalytic synergetic factor is 1.33. DFT study calculations suggests s that the valence and conduction band of F-TiO₂consist of the electrons of O2 p and Ti 3 d, while the small amount of electrons of F 2 p do not change the band gap of TiO₂.

Key words: TiO₂nanotube arrays, F doped, Visible visible light, Electronic electronic Structures structures

中图分类号:

O643

陈秀琴, 张兴旺, 雷乐成. F掺杂 TiO₂ 纳米管阵列的可见光催化活性和电子结构[J]. 无机材料学报, 2011, 26(4): 369-374.

CHEN Xiu-Qin,ZHANG Xing-Wang,LEI Le-Cheng. Electronic Structures and Photocatalysis Properties under Visible Irradiation and of F-doped TiO₂ nanotube Nanotube arrays Arrays[J]. Journal of Inorganic Materials, 2011, 26(4): 369-374.

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F掺杂 TiO₂ 纳米管阵列的可见光催化活性和电子结构

Electronic Structures and Photocatalysis Properties under Visible Irradiation and of F-doped TiO₂ nanotube Nanotube arrays Arrays

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