(1. 華南農(nóng)業(yè)大學(xué) 理學(xué)院應(yīng)用化學(xué)系，廣州 510642;
2. 湖南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410082;
3. 華南農(nóng)業(yè)大學(xué) 動物科學(xué)學(xué)院實驗中心， 廣州 510642)
摘 要: 采用酸催化溶膠-凝膠法合成硫摻雜納米TiO2光催化劑。 可見光光催化降解亞甲基藍(lán)實驗結(jié)果表明： 當(dāng)硫脲與鈦酸丁酯摩爾比為3.50時， 催化劑經(jīng)500 ℃熱處理后表現(xiàn)出最佳的可見光光催化降解效果。 TEM、 XRD和Raman光譜等表征結(jié)果表明： 硫摻雜大大提高了納米TiO2晶粒的分散程度， 有利于制備均一分散的納米晶粒； 另外， 硫摻雜有效地抑制了納米TiO2在熱處理過程中由銳鈦礦向金紅石的轉(zhuǎn)變， 一部分硫進(jìn)入TiO2的晶格取代部分Ti4+而導(dǎo)致一定程度畸變, 產(chǎn)生氧缺位， 從而大大提高催化劑的可見光催化活性。
關(guān)鍵字: 納米TiO2; 硫摻雜； 酸催化溶膠-凝膠法； 可見光催化降解
（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
