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.
出处
《功能材料》
EI
CAS
CSCD
北大核心
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)
关键词
二氧化钛
光催化
钆
掺杂
制氢
titanium dioxide
p hotocatalysis
Gd
doping
hydrogen
