烘干温度对氮掺杂二氧化钛光催化剂性能的影响  

Effect of drying temperature on performance of N-doped TiO_2 photocatalyst

作　　者：江元[1] 李越湘[1] 彭绍琴[1] 江风益[2] 

机构地区：[1]南昌大学化学系,江西南昌330031 [2]南昌大学材料科学研究所,江西南昌330047

出　　处：《功能材料》2010年第7期1140-1143,共4页Journal of Functional Materials

基　　金：长江学者和创新团队发展计划资助项目(IRT0730);国家自然科学基金资助项目(20763006);国家重点基础研究发展规划资助项目(2009CB220003);江西省自然科学基金资助项目(2007GZH1754);江西省教育厅科技资助项目(GJJ09041)

摘　　要：以Ti(SO4)2为原料,通过氨水水解法制备氮掺杂二氧化钛前驱体,煅烧前驱体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、透射电镜、热重-差热分析和比表面等方法对制备的样品进行表征。以蓝色发光二极管为光源,用甲醛降解反应考察了光催化剂的活性。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;低温烘干制备的催化剂相对高温烘干的具有较小的粒子尺寸和较大的比表面。烘干温度显著影响光催化性能,低温烘干的催化剂活性较高。A nitrogen-doped TiO2 （N-TiO2） photocatalyst consisted of nanoparticles was prepared by the calcination of the hydrolysis product of Ti（SO4）2 with aqueous ammonia.The prepared samples were characterized by XRD,UV-vis diffuse reflectance spectra （DRS）,transmission electron microscope （TEM）,thermogravimetric and differential thermal analysis （TG-DTA） and BET.Its photocatalytic activity was evaluated by degradation of formaldehyde under visible irradiation using blue light LED as light source.The catalyst is consisted of anatase phase.Nitrogen-doping leads to extend optical absorption to the visible-light region.The photocatalyst prepared at lower drying temperature has smaller particle size and larger specific surface area than that prepared at higher drying temperature.The drying temperature has significant influence on its photocatalytic activity and the photocatalyst dried at lower temperature has higher photocatalytic activity than that dried at higher temperature.

关 键 词：氮掺杂 二氧化钛 光催化降解 甲醛 烘干温度 

分 类 号：O643[理学—物理化学]