(1. 华南农业大学 理学院应用化学系，广州 510642;
2. 湖南大学 材料科学与工程学院， 长沙 410082;
3. 华南农业大学 动物科学学院实验中心， 广州 510642)
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。
关键字: 纳米TiO2; 硫掺杂； 酸催化溶胶-凝胶法； 可见光催化降解
（1. Department of Applied Chemistry, College of Science,
South-China Agricultural University, Guangzhou 510642, China;
2. College of Materials Science and Engineering, Hunan University,
Changsha 410082, China;
3. Center of Testing, College of Animal Science,
South-China Agricultural University, Guangzhou 510642, China）
Abstract: 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(OC4H9)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 Ti4+ 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.
Key words: nano-TiO2; sulfur doping; sol-gel method with acid as catalytic; visible light catalytic degradation
