有机硫化物在Ag+改性钛铌酸盐上的吸附和光催化氧化

 使用Ag+改性的钛铌酸钾盐（6K2O·TiO2·5Nb2O5）作为光催化剂，考察了二甲基硫醚（DMS）、乙硫醇（EM）及它们分别与正己烷混合物在Ag+改性的钛铌酸钾盐表面吸附与光催化氧化作用，采用红外光谱方法对吸附与光催化氧化样品进行表征。结果表明，在Ag+改性钛铌酸盐表面，DMS吸附作用较弱，在可见光辐射下稳定。但在紫外光辐射下氧化成亚砜、砜、硫酸酯与单齿硫酸盐等，而EM的吸附较强,在可见光辐射下即可氧化为乙基磺酸(CH3CH2SO2OH)。正己烷增强了DMS和EM同Ag+改性钛铌酸盐表面的作用力，促进了DMS和EM的深度氧化。

ADSORPTION AND PHOTOCATALYTIC OXIDATION OF ORGANIC SULFIDES ON Ag~+-MODIFIED TITANONIOBATE

Ag~+-modified titanoniobate was used as photocatalyst, which was prepared with potassium titanoniobate (6K_2O· TiO_2·5Nb_2 O_5) through Ag~+ modification. The adsorption feature and photocatalytic activity of dimethyl sulfide (DMS), ethyl mercaptan (EM), and the mixture of n-hexane with DMS or EM, respectively, on the as-prepared Ag~+-modified titanoniobate were evaluated through infrared spectroscopy technique. The results showed that the DMS adsorbed on the surface of Ag~+-modified titanoniobate was stable under visible light irradiation due to a weak interaction between it and the catalyst surface, while it was converted to DMSO, DMSO_2, dimethyl sulfate and monodentate sulphate under ultra-light irradiation. The EM adsorbed on the surface of Ag~+-modified titanoniobate was converted to ethyl sulfonic acid (CH_3CH_2SO_2OH) even though under visible light irradiation due to a strong interaction between EM and the catalyst surface. The interaction between DMS or EM and the surface of the Ag~+-modified titanoniobate was enhanced and the oxidation of DMS and EM was promoted when they were mixed with n-bexane.