铕掺杂TiO2的制备及其可见光光催化性能研究

doi:10.7517/j.issn.1674-0475.2012.01.60

影像科学与光化学 ›› 2012, Vol. 30 ›› Issue (1): 60-70.DOI: 10.7517/j.issn.1674-0475.2012.01.60

铕掺杂TiO₂的制备及其可见光光催化性能研究

郑云¹, 顾彦¹, 汪淑廉¹, 杨静¹, 兰天龙¹, 黄应平¹, 张爱清²

1. 三峡大学三峡库区生态环境教育部工程研究中心, 湖北宜昌 443002;
2. 中南民族大学催化材料科学湖北省暨国家民委-教育部共建重点实验室, 湖北武汉 430070

收稿日期:2011-05-30 修回日期:2011-08-01 出版日期:2012-01-15 发布日期:2012-01-15
通讯作者: 黄应平, 教授,E-mail: huangyp@ctgu.edu.cn.
基金资助:
国家自然科学基金(20877048,21177072; 湖北省创新群体(2009CDA020)及催化材料科学湖北省暨国家民委-教育部共建重点实验室开放基金(CHCL10007).

Preparation and Photocatalytic Properties of Eu-Doped TiO₂ under Visible Light Irradiation

ZHENG Yun¹, GU Yan¹, WANG Shu-lian¹, YANG Jing¹, LAN Tian-long¹, HUANG Ying-ping¹, ZHANG Ai-qing²

1. China Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, Hubei, P.R.China;
2. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities, Wuhan 430070, Hubei, P.R.China

Received:2011-05-30 Revised:2011-08-01 Online:2012-01-15 Published:2012-01-15

摘要/Abstract

摘要： 采用溶胶-凝胶法制备了不同铕(Eu)掺杂量的TiO₂纳米颗粒(Eu-TiO₂),利用透射电镜(TEM),X射线光电子能谱(XPS),X射线衍射(XRD)及紫外可见漫反射(UV-Vis DRS)等方法对Eu-TiO₂进行了物理特性的初步表征.结果表明:与未掺杂纳米TiO₂比较,Eu-TiO₂禁带宽度变窄,具有可见光光催化活性.在可见光下(λ≥420 nm)照射下,以光催化降解染料罗丹明B(Rhodamine B,RhB)为目标反应,探讨了Eu-TiO₂不同制备条件对RhB降解光催化活性的影响,优化得到制备高活性Eu-TiO₂最佳pH为3、掺杂比例(n_Eu/n_Ti)为0.05%、煅烧温度为500 ℃.研究了可见光照射下Eu-TiO₂降解RhB和无色有机小分子水杨酸(SA)光催化反应条件及降解特性,RhB的12 h深度氧化矿化率为60.2%,SA的8 h降解率达到100%.通过跟踪测定可见光下Eu-TiO₂光催化反应过程中氧化物种的变化,研究了可见光激发Eu-TiO₂光催化反应机理,表明其光催化反应主要涉及羟基自由基(·OH)历程.

关键词: 铕(Eu)掺杂, 晶格畸变, 光催化

Abstract: Eu-doped TiO₂ nano-particles had been prepared by sol-gel method and characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and UV-visible diffuse reflectance spectra (UV-Vis DRS). The results showed that the band gap of Eu-TiO₂ was narrower than that of TiO₂. Eu-TiO₂had photocatalytic activity. The effect of preparation conditions of orgaric compounds on the degradation of rhodamine B(RhB) was studied. The optimal conditions were pH 3, n_Eu/n_Ti=0.05% and calcination temperature 500 ℃. The degradation of rhodamine B (RhB) and salicylic acid (SA) under visible light irradiation were used as testing reactions to analyze the activity of Eu-TiO₂ with different loadings. The results showed that RhB and SA were effectively degraded and mineralized, and the degradation reaction was predominated by the hydroxyl radical (·OH).

Key words: Eu-doped, lattice expansion, photocatalysis

中图分类号:

郑云, 顾彦, 汪淑廉, 杨静, 兰天龙, 黄应平, 张爱清. 铕掺杂TiO₂的制备及其可见光光催化性能研究[J]. 影像科学与光化学, 2012, 30(1): 60-70.

ZHENG Yun, GU Yan, WANG Shu-lian, YANG Jing, LAN Tian-long, HUANG Ying-ping, ZHANG Ai-qing. Preparation and Photocatalytic Properties of Eu-Doped TiO₂ under Visible Light Irradiation[J]. Imaging Science and Photochemistry, 2012, 30(1): 60-70.

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铕掺杂TiO₂的制备及其可见光光催化性能研究

Preparation and Photocatalytic Properties of Eu-Doped TiO₂ under Visible Light Irradiation

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