具有可见光光催化活性N掺杂纳米二氧化钛的制备和表征  

Preparation and characterization of N-doped TiO_2 nano-powder with visible light photocatalytic activity

作　　者：彭兵[1] 刘立强[1] 齐萨仁[1] 柴立元[1] 刘云超[1] 李国良[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2009年第4期944-949,共6页Journal of Central South University:Science and Technology

基　　金：湖南省科技厅科技计划项目(2007CK3075)

摘　　要：以廉价的TiOSO4为原料,通过水解法制备正钛酸前驱体,然后,向正钛酸前驱体中加入尿素作为氮源,经煅烧制备氮掺杂纳米二氧化钛。用X射线衍射、紫外-可见吸收光谱、热重-差热分析和X射线光电子能谱等方法对制备的样品进行表征,考察煅烧温度、煅烧时间及Ti与N配比等对光催化活性的影响。研究结果表明:制备的样品均为锐钛矿,氮掺杂使二氧化钛在可见光区的光吸收明显增强;煅烧温度和Ti与N配比对光催化性能影响显著;于400℃制备的样品中存在1个最佳的Ti与N配比,所对应的可见光催化活性最强,甲基橙降解实验15min时脱色率达到97%。The nano-meter particle of TiO2 precursor was prepared by hydrolysis with industrial titanic solution, and then urea was added as the source of nitrogen. The mixture was calcined to obtain N-doped TiO2. The prepared samples were then characterized using X-ray diffractrometry, UV-Vis absorption spectra, TG-DTA and X-ray photoelectron spectroscopy. The effects of calcination temperature, time and mole ratio of Ti to N on the photocatalytic activity were investigated. The results show that all catalysts are anatase, and the doping of nitrogen leads to an obvious increase in optical absorption intensity in the visible-light region. The calcination temperature and mole ratio of Ti to N has significant influence on photoctalytic activity. There exists an optimal mole ratio of Ti to N for the catalysts calcined at 400℃, which results in the highest visible-light photoctalytic activity. In the experiment of degradation of methyl orange, the degradation rate reaches 97% in 15 min.

关 键 词：硫酸氧钛 氮掺杂TiO2 尿素 可见光 光催化 

分 类 号：TQ134.11[化学工程—无机化工]