硫掺杂对纳米TiO_2的结构相变及可见光催化活性的影响  

Effects of sulfur doping on structure phase transformation and visible-light photocatalytic activity of nano-TiO_2

作　　者：周武艺[1] 曹庆云[2] 唐绍裘[3] 罗颖[1] 

机构地区：[1]华南农业大学理学院应用化学系,广州510642 [2]华南农业大学动物科学学院实验中心,广州510642 [3]湖南大学材料科学与工程学院,长沙410082

出　　处：《中国有色金属学报》2006年第7期1233-1238,共6页The Chinese Journal of Nonferrous Metals

基　　金：华南农业大学博士启动基金资助项目(K06128)

摘　　要：采用酸催化溶胶凝胶法合成硫掺杂纳米TiO2光催化剂。可见光光催化降解亚甲基蓝实验结果表明:当硫脲与钛酸丁酯摩尔比为3.50时,催化剂经500℃热处理后表现出最佳的可见光光催化降解效果。TEM、XRD和Raman光谱等表征结果表明:硫掺杂大大提高了纳米TiO2晶粒的分散程度,有利于制备均一分散的纳米晶粒;另外,硫掺杂有效地抑制了纳米TiO2在热处理过程中由锐钛矿向金红石的转变,一部分硫进入TiO2的晶格取代部分Ti4+而导致一定程度畸变,产生氧缺位,从而大大提高催化剂的可见光催化活性。The sulfur-doped nano-TiO2 photocatalysts were obtained by sol-gel method using acid as catalyst. The results of visible light photocatalytic degradation of methyleneblue demonstrate that the sulfur-doped TiO2 exhibits the best photocatalytic activity while the mole ratio of thiourea and tetrabutyltitanate[Ti（OC4 H9 ）4] is 3.5 and the doped TiO2 is calcined at 500 ℃ for 2 h. The results of transmission electron microscope （TEM）, X-ray diffraction （XRD） and Raman scattering spectrum show that the sulfur doping improves the dispersion of nano-TiO2 particles. The well-dispersed sulfur-doped TiO2 nanoparticles were obtained after calcined at 500℃ for 2 h. Sulfur doping restrains effectively the phase transformation from anatase to rutile. Some of Ti^4＋ ions in TiO2 crystals are replaced by sulfur ions, which results in the localized crystal distortion of TiO2 crystal,and produces the oxygen defect, which improves the visible light catalytic activity.

关 键 词：纳米TIO2 硫掺杂 酸催化溶胶-凝胶法 可见光催化降解 

分 类 号：O643[理学—物理化学]