Ce掺杂TiO_2/SiO_2的制备及其光催化降解罗丹明B  

Preparation of Ce-doped TiO_2/SiO_2 photocatalysts and their photocatalytic activity

作　　者：谢英娜[1] 高子伟[2] 刘新杰[1] 

机构地区：[1]内蒙古科技大学化学与化学工程学院,包头014010 [2]陕西师范大学化学与材料科学学院应用表面与胶体化学教育部重点实验室,西安710062

出　　处：《化工新型材料》2011年第5期79-81,共3页New Chemical Materials

基　　金：国家自然科学基金(20771071);教育部"新世纪优秀人才支持计划"项目;陕西省自然科学基金(2007B06;2006B23)

摘　　要：采用溶胶-凝胶法制备了纯TiO2和掺杂不同含量Ce的TiO2/SiO2复合纳米粒子。并用FT-IR,UV-Vis对样品结构进行了表征,并以罗丹明B(RB)的光催化降解为探针反应,评价了其光催化性能。结果表明,TiO2/SiO2催化剂中形成了新的Ti-O-Si键,Ce的掺杂使TiO2/SiO2光谱响应范围向可见光区拓展。与未掺杂的TiO2/SiO2相比较,掺杂的TiO2/SiO2具有更高的催化性能。Ce掺杂的最佳值为x(Ce)∶x(Ti)=0.0090,光催化剂最佳投放量为30mg。Pure TiO2 and Ce doped TiO2/SiO2 composite nano-particles with different molar fractions of Ce were prepared by a sol-gel method and were characterized by FT-IR,UV-Vis spectra.The photocatalytic degradation of Rhodamine B（RB） in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity.From FT-IR analysis,a new band at 968 cm-1 for Ti-O-Si vibration was observed.The results showed that Ce4＋ dopant greatly restrained TiO2/SiO2 phase transformation,and made the optic response range of TiO2/SiO2 particles expand to the visual light.Ce-doped TiO2/SiO2 had better visible photoactivity than TiO2/SiO2.The composite nano-particles with Ce/TiO2 molar ratio of 0.009,The optimal concent ration of the nano-particles Ce-TiO2/SiO2 was 30mg.

关 键 词：二氧化钛 掺杂 溶胶-凝胶法 光催化降解 

分 类 号：X50[环境科学与工程—环境工程]