摘要
以钛酸丁酯和硫脲为原料,用溶胶凝胶法制备掺杂硫的TiO2光催化剂,并用XRD、XPS、及UV-Vis吸收光谱对粉体进行了表征.以其对亚甲蓝和1-萘酚-8-磺酸的去除率来考察催化剂的可见光活性.结果表明:硫的掺杂减小了TiO2的禁带能隙,使其在可见光区具有光催化活性.硫的掺杂量对TiO2光催化剂的可见光吸收范围及可见光活性有明显的影响.当S掺杂量在1.2%时,样品的吸收带边可达450nm,对亚甲蓝的光降解率最高.10mg.L-1的1-萘酚-8-磺酸使用1.2%S-TiO2催化剂在可见光下反应7h,去除率达72.4%.该催化剂为锐钛矿型,平均粒径约为7.4nm.XPS分析结果表明,S原子在催化剂中主要以S6+和S4+价态存在.
S-doped TiO2 nanoparticles were synthesized by sol-gel method with tetrabutyl titanate and thiourea as precursor. The S-TiO2 photoeatalyst characterized by XRD, XPS, UV-Vis and the photocatalytic activity was evaluated by photodegradation of methylene blue and 1-naphthol-8-sulfonic acid under visiblelight radiation. The results showed that doped S reduced energy band gap of TiO2, thereby increasing the photocatalytivity in the visible-light region. The visible-light responding bound and photocatalytic activity of catalyst were affected by the doping amount. The 1.21% S doped TiO2 UV-Visible absorption band was about 450 nm, and the removal efficiency of methylene blue was the biggest. The concentration of the 1- naphthol-8-sulfonic acid was 10 mg ·L^-1, and the photocatalytic degradation rate can reach 72.4% under visible-light illuminated 7 h with 1.2% S-TiO2. The average particle diameter of resultant S-TiO2 was about 7. 4 nm and its crystal form was anatase. The formation of S atoms in S-TiO2 particles was determined to be mainly S^6＋ and S^4＋ from X-ray photoelectron spectra （XPS）.
出处
《南京师大学报（自然科学版）》
CAS
CSCD
北大核心
2007年第4期56-60,共5页
Journal of Nanjing Normal University(Natural Science Edition)
基金
江苏省教育厅自然科学基金(05KJD6010110)资助项目.
关键词
溶胶-凝胶法
硫掺杂
掺杂量
可见光
光催化降解
sol-gel method, S-doping, doping amount, visible-light, photodegradation
