摘要
采用溶胶-凝胶法制备了纯TiO2和La掺杂TiO2复合纳米粉体,通过XRD,UV-Vis等测试手段分析了在紫外光照射下,以降解甲基橙为探针反应研究其可见光催化性能。结果显示样品均为锐钛矿相纳米TiO2,稀土元素镧掺杂后纳米TiO2特征衍射峰宽化,强度降低;掺入的La主要以La2O3的形式存在,同时有一部分形成Ti-O-La键;La掺杂可减小TiO2晶粒尺寸及增大催化剂比表面积;与未掺杂的二氧化钛相比较,适当含量的镧掺杂可有效促进TiO2表面光生载流子的分离,从而显著提高其光催化活性。当La/Ti的摩尔比为0.010时,可见光催化性能最好。
Pure nano TiO2 and La-doped nano-TiO2 catalyst were prepared by a sol-gel method process and charac- terized by XRD and UV-Vis. The UV-light photoeatalytie performance of the obtained materials was evaluated by methyl- ene orange（OM）decomposition. The results showed that the samples were all pure anatase phase nano-TiO2, and their dif- fraction peak were broadens obviously after La-doping. Laa＋ dispersed onto TiOz as the form of La20a and partly as the form of Ti-O-La bond. La dopant can is also beneficial to gain smaller particle size and large surface area of TiO2. Compared with pure TiO2, the appropriate content of La-doping could effectively promote the separation effect of surface photoinduced charge carriers on TiO2, which was responsible for the remarkable increase in photoeatalytic activity. The photocatalytie ac- tivity of La co-doped TiO2 was higher than that of TiOz or La-doped TiOz, which was enhanced with increasing the content of La ,and reaching the maximum at the La/Ti molar ratios of 0. 010.
出处
《化工新型材料》
CAS
CSCD
北大核心
2013年第6期169-170,185,共3页
New Chemical Materials
基金
内蒙古包头市科技局资助项目(2010Z1002)
内蒙古科技大学创新基金项目(2011NCL025)
关键词
纳米TIO2粉体
LA掺杂
甲基橙
光催化降解
Ti02 nanopartiele, La co-doping, methylene orange, photocatalytie degradation
