| 铕掺杂TiO2的制备及其可见光光催化性能研究 |
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| 引用本文： | 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. |
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| 作者姓名： | 郑云 顾彦 汪淑廉 杨静 兰天龙 黄应平 张爱清 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金，湖北省创新群体项目，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 |
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| 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(nEu/nTi)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.
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| 关 键 词： | 铕(Eu)掺杂 晶格畸变 光催化 |
| 收稿时间： | 2011-05-30 |
Preparation and Photocatalytic Properties of Eu-Doped TiO2 under Visible Light Irradiation |
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| 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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| Authors: | ZHENG Yun GU Yan WANG Shu-lian YANG Jing LAN Tian-long HUANG Ying-ping ZHANG Ai-qing |
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| Institution: | 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 |
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| 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-TiO2 had 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,nEu/nTi=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). |
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| Keywords: | Eu-doped lattice expansion photocatalysis |
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