可见光响应Pt沉积La2O3/TiO2制备及其对甲苯的光热催化去除

doi:10.3724/SP.J.1077.2011.01175

无机材料学报 ›› 2011, Vol. 26 ›› Issue (11): 1175-1180.DOI: 10.3724/SP.J.1077.2011.01175

可见光响应Pt沉积La₂O₃/TiO₂制备及其对甲苯的光热催化去除

仲鑫, 孙剑, 刘守新

(东北林业大学生物质材料教育部重点实验室, 哈尔滨 150040)

收稿日期:2010-12-23 修回日期:2011-03-10 出版日期:2011-11-20 网络出版日期:2011-11-11
作者简介:仲鑫(1986-), 女, 硕士研究生. E-mail: zhongxinmagic@163.com
基金资助:
中央高校基本科研业务费专项基金(DL09DB01); 博士点基金(20100062110003)

Preparation of Visible Light Response Pt-doped La₂O₃/TiO₂ and Thermo-photocatalytic Degradation of Toluene

ZHONG Xin, SUN Jian, LIU Shou-Xin

(Key Laboratory of Biological Materials of Ministry of Education, Northeast Forestry University, Harbin 150040, China)

Received:2010-12-23 Revised:2011-03-10 Published:2011-11-20 Online:2011-11-11
Supported by:
Fundamental Research Fund for the Central Universities (DL09DB01); Doctoral Fund of Ministry of Education of China (20100062110003)

摘要/Abstract

摘要： 以钛酸四丁酯和硝酸镧为原料, 采用溶胶?凝胶法制备La₂O₃/TiO₂, 通过光沉积法在La₂O₃/TiO₂表面负载纳米Pt粒子. 采用XPS、FTIR、XRD、DRS、TEM和低温氮物理吸附对光催化剂的晶体结构、光谱特征和表面结构进行表征. 考察了催化剂在可见光下对甲苯的去除性能和温度对催化剂去除甲苯的影响. 结果表明, 沉积的Pt以单质和吸附氧的形式存在, 其中以吸附氧的形式为主. Pt的掺入没有引起TiO₂相结构的变化, 减小了晶粒尺寸并增大了催化剂的比表面积. 纳米Pt均匀地分布在La₂O₃/TiO₂上, 尺寸分布比较均一, 大约为5~10nm. Pt-La₂O₃/TiO₂的表面羟基官能团伸缩振动明显增强, 比TiO₂和La₂O₃/TiO₂具有更高的可见光催化活性. Pt-La₂O₃/TiO₂对甲苯的降解率, 随着温度的升高而增大, 产生了与光催化作用平行的热催化作用. 气相甲苯光热催化过程不是光催化与热催化的简单叠加, 而是存在协同作用.

关键词: 可见光, Pt沉积, La 掺杂, TiO₂, 甲苯

Abstract: Pt-La₂O₃/TiO₂ photocatalyst was prepared by Sol-Gel and photodeposition methods using Ti(OBu)₄ and La(NO)₃·6H₂O as raw material. The catalyst was characterized by XPS, FTIR, XRD, DRS, TEM, and N2(77K) adsorption. The performance of photocataltic in the removal of toluene under visible light and the influence of temperature on removal of toluene were investigated. The results showed that doped-Pt existed as the forms of single Pt and oxygen-adsorption. Pt loading had no influence on the phase composition of TiO₂, but decreased TiO₂particle size and increased the surface area. Nano-Pt was uniformly dispersed on La₂O₃/TiO₂ with diameter of 5-10 nm. Pt-La₂O₃/TiO₂has much more hydroxyl group than TiO₂ and La₂O₃/TiO₂. The rate of photocatalytic oxidation gaseous toluene on Pt-La₂O₃/TiO₂increased with the temperature increasing, and thermal catalytic reaction taken place in parallel with photocatalytic oxidation reaction. There is a synergetic effect between photocatalysis and thermal catalysis in the thermo-photocatalysis degradation of toluene.

Key words: visible light, Pt loading, La₂O₃/TiO₂, TiO₂, toluene

中图分类号:

TB333

仲鑫, 孙剑, 刘守新. 可见光响应Pt沉积La₂O₃/TiO₂制备及其对甲苯的光热催化去除[J]. 无机材料学报, 2011, 26(11): 1175-1180.

ZHONG Xin, SUN Jian, LIU Shou-Xin. Preparation of Visible Light Response Pt-doped La₂O₃/TiO₂ and Thermo-photocatalytic Degradation of Toluene[J]. Journal of Inorganic Materials, 2011, 26(11): 1175-1180.

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可见光响应Pt沉积La₂O₃/TiO₂制备及其对甲苯的光热催化去除

Preparation of Visible Light Response Pt-doped La₂O₃/TiO₂ and Thermo-photocatalytic Degradation of Toluene

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