氧缺陷型TiO2-x可见光催化性能的研究

doi:10.3724/SP.J.1077.2012.12097

无机材料学报 ›› 2012, Vol. 27 ›› Issue (12): 1301-1305.DOI: 10.3724/SP.J.1077.2012.12097 CSTR: 32189.14.SP.J.1077.2012.12097

氧缺陷型TiO_2-x可见光催化性能的研究

操小鑫, 陈亦琳, 林碧洲, 高碧芬

(华侨大学材料科学与工程学院厦门 361021)

收稿日期:2012-02-18 修回日期:2012-04-20 出版日期:2012-12-20 网络出版日期:2012-11-19
作者简介:操小鑫 (1986–), 男, 硕士研究生.
基金资助:
国家自然科学基金(21003055, 21103054); 福建省自然科学基金(2012J01043); 华侨大学高层次人才资助项目(06BS213)

Study of the Photocatalytic Performance of Oxygen-deficient TiO₂ Active in Visible Light

CAO Xiao-Xin, CHEN Yi-Lin, LIN Bi-Zhou, GAO Bi-Fen

(College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China)

Received:2012-02-18 Revised:2012-04-20 Published:2012-12-20 Online:2012-11-19
About author:CAO Xiao-Xin.
Supported by:
National Natural Science Foundation of China (21003055, 21103054); Natural Science Foundation of Fujian Province (2012J01043); Startup Fund for the Talent of Huaqiao University (06BS213)

摘要/Abstract

摘要： 采用氢气还原法制备氧缺陷型二氧化钛(TiO_2-x), 考察氧气氛中不同返烧温度对TiO_2-x性能的影响. 利用X射线光电子能谱、电子自旋共振谱、紫外-可见漫反射光谱和荧光光谱等技术对样品的表面化学状态、氧缺陷位的种类、光吸收性能和光生载流子的分离效率等性质进行了表征, 并以气相的苯为模型污染物, 研究催化剂样品在可见光(λ > 400 nm)照射下的光催化氧化能力. 结果表明, 与未返烧的催化剂相比, 返烧后TiO_2-x对苯的光催化氧化降解能力显著提高, 反应4 h、催化剂活性稳定后, 经300℃返烧的TiO_2-x样品对苯的转化率为36.9 %, 是未返烧样品的5.3倍. 还原过程中生成的体相氧缺陷位(束缚单电子的氧空位)是催化剂具有可见光催化性能的主要原因, 返烧热处理减少了催化剂表面氧缺陷位(Ti³⁺)的浓度并有效地抑制了光生载流子的复合.

关键词: 氧缺陷位, TiO₂, 可见光, 光催化

Abstract: Oxygen-deficient titanium dioxide (TiO_2-x) was prepared by heating TiO₂ in H₂ atmosphere, followed by the post-calcination in O₂ at different temperatures. The physicochemical properties of the products were characterized by X-ray photoelectron spectroscope (XPS), electron spin resonance (ESR), UV-Vis diffuse reflectance spectrum (UV-Vis DRS) and photoluminescence spectrum (PL). The photocatalytic activity of the as-prepared samples was determined by the degradation of gas-phase benzene under visible light (λ > 400 nm) irradiation. The results show that the TiO_2-x post-heated at 300℃ exhibits the highest photocatalytic activity. After photocatalytic oxidation for 4 h, the conversion rate of benzene over the catalyst is up to 36.9% at steady state, which is 5.3 times as much as that on the untreated sample. The enhanced photocatalytic performance of the TiO_2-x is related to the amount of the oxygen vacancies in matrix (single-electron-trapped oxygen vacancies). The postcalcination successfully reduces the surface oxygen vacancies (Ti³⁺), efficiently hindering the photoinduced carriers from recombination.

Key words: oxygen vacancy, TiO₂, visible light, photocatalysis

中图分类号:

O643

操小鑫, 陈亦琳, 林碧洲, 高碧芬. 氧缺陷型TiO_2-x可见光催化性能的研究[J]. 无机材料学报, 2012, 27(12): 1301-1305.

CAO Xiao-Xin, CHEN Yi-Lin, LIN Bi-Zhou, GAO Bi-Fen. Study of the Photocatalytic Performance of Oxygen-deficient TiO₂ Active in Visible Light[J]. Journal of Inorganic Materials, 2012, 27(12): 1301-1305.

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氧缺陷型TiO_2-x可见光催化性能的研究

Study of the Photocatalytic Performance of Oxygen-deficient TiO₂ Active in Visible Light

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氧缺陷型TiO2-x可见光催化性能的研究

Study of the Photocatalytic Performance of Oxygen-deficient TiO2 Active in Visible Light

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氧缺陷型TiO_2-x可见光催化性能的研究

Study of the Photocatalytic Performance of Oxygen-deficient TiO₂ Active in Visible Light