V掺杂TiO_2纳米粒子的制备及其光催化研究  

Synthesis of V Doped TiO_2 Nanoparticles and Its Photocalysis Investigation

作　　者：张东日[1] 

机构地区：[1]延边大学工学院化学工程与工艺系,吉林延吉133002

出　　处：《广州化工》2014年第24期77-79,102,共4页GuangZhou Chemical Industry

基　　金：延边大学博士启动基金(012800-910600017)

摘　　要：溶胶-凝胶法制备5at.％V掺杂的TiO2和纯TiO2,然后在500℃煅烧6 h。 XRD谱图显示,样品均是锐钛矿型TiO2,还有一些无定型成分,平均晶粒大小分别为6.8 nm和9.7 nm。 TEM照片显示的纳米粒子大小分别在8.0-18.7 nm和21.6-30.2 nm范围内,比XRD计算结果大,这是因为样品未能充分分散所造成。 EDS谱图显示V的掺杂量是6.5at.％,红外光谱也证实V元素的存在。拉曼光谱表明, V元素均匀地分散在TiO2中。 Rh. B的光催化降解实验表明, V掺杂TiO2的光催化效率比纯TiO2低,这是由于较高的掺杂浓度导致电子-空穴复合中心增加,从而降低光催化效率。5at.%V doped TiO2 and pure TiO2 nanoparticles were synthesized throug the sol-gel method and calcined at 500 ℃ for 6 h. XRD pattens showed that both samples were anatase TiO2 with some amorphous and crystal sizes were 6. 8 nm and 9. 7 nm, respectively. TEM images showed that nanoparticle sizes were in the ranges of 8. 0-18. 7 nm and 21. 6-30. 2 nm for V doped TiO2 and pure TiO2 , respectively, larger than the values calculated from the XRD patterns, due to the poor dispersion of TiO2 samples. EDS measurement confirmed the presence of V elements with a 6. 5at.%, also supported by IR spectrum. Raman spectrum confirmed the well dispersions of V elements in the TiO2 matrix. The photodegradation of Rh. B showed that the photodegradation efficiency of V doped TiO2 was lower than that of pure TiO2 , probably due to the enhancement of electron-hole pair recombination rate resulted from the high doping level.

关 键 词：二氧化钛 钒掺杂 光催化 罗丹明B 

分 类 号：O64[理学—物理化学]