Gd^(3+)掺杂纳米TiO_2的制备及光解水制氢性能研究  

The preparation of nanoparticle Gd^(3+)-doped TiO_2 and the performance of photocatalytic decomposition of water into hydrogen

作　　者：彭绍琴[1] 李凤丽[1] 李越湘[1] 吕功煊[2] 李树本[2] 

机构地区：[1]南昌大学化学系,江西南昌330047 [2]中国科学院兰州化学物理研究所,羰基合成与选择氧化国家重点实验室,甘肃兰州730000

出　　处：《功能材料》2006年第10期1663-1666,共4页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2003CB214503);江西省教育厅基金资助项目(赣教技字[2005]37号)

摘　　要：采用溶胶-凝胶法和溶胶-凝胶浸渍法制备了纯的和Gd3+掺杂的纳米TiO2,并利用XRD,电化学,PL光谱和UV-vis漫反射光谱等手段对样品进行了表征。考察了焙烧温度和Gd3+掺杂量对TiO2在紫外光照射下光催化分解水制氢活性的影响。结果发现Gd3+的掺入提高了TiO2光解水制氢活性,并且用溶胶-凝胶浸渍法制备的Gd3+掺杂TiO2光催化剂的活性优于用溶胶-凝胶法制备的光催化剂活性,Gd3+的最佳掺杂量为0.5%(质量分数),催化剂的最佳煅烧温度为500℃。Gd3+的掺入阻止了TiO2由锐钛矿相向金红石相的转变,抑制了晶粒的生长,在紫外区的光吸收能力增强,电子-空穴对的分离效率提高,从而提高了TiO2光催化分解水制氢活性。Pure and Gd^3＋-doped TiO2 nanoparticle photocatalysts were prepared by sol-gel and sol-gel impregnation method, and characterized by means of X-ray diffraction, electrochemistry, PL and UV-vis absorption spectra. The effects of Gd^3＋ doping content and calcinated temperature on the photocatalytic activity for hydrogen generation of photocatalysts under ultraviolet light irradiation were investigated. The results show that the activity of photocatalysts prepared by sol-gel impregnation method was higher than that by sol-gel method, the optimal Gd^3＋ doping content and calcinated temperature of photocatalysts were 0.5wt% and 500℃, respectively. The phase transfer from anatase to futile and the grain growth of TiO2 were inhibited by doping Gd^3＋ , the absorption intensity and the separation of photo-generated electrons and holes of Gd^3＋ doped TiO2 were promoted compared with pure TiO2 so that the activity of hydrogen generation from water was increased.

关 键 词：二氧化钛 光催化 钆 掺杂 制氢 

分 类 号：O643[理学—物理化学]