Ag~+改性复合钛铌酸钾盐对二甲基硫醚和乙硫醇吸附与光催化氧化研究

采用高温固相法合成具有不同Nb/Ti摩尔比的复合钛铌酸钾盐,通过Ag+离子交换对其进行改性。在静态下评价了Ag+改性复合钛铌酸钾盐对二甲基硫醚(DMS)和乙硫醇(EM)的吸附与紫外光催化氧化作用,使用红外光谱技术对催化剂表面滞留物种进行表征。结果表明,Ag+改性复合钛铌酸钾盐对DMS的吸附作用力比EM弱。随着Nb/Ti摩尔比增加,Ag+改性复合钛铌酸钾盐对EM的吸附作用力增强。在紫外光辐射下,Ag+改性的复合钛铌酸钾盐将DMS氧化为亚砜、砜和硫酸盐,而EM则被氧化为磺酸和单齿硫酸盐。

Adsorption and photocatalytic oxidation of DMS and EM on Ag~+ modified composite potassium titanoniobates

Composite potassium titanoniobates with different molar ratio of Nb and Ti were synthesized by the solid-state method and then modified by Ag~+ ion-exchange. The adsorption feature and photocatalytic oxidation activi-ty for dimethyl sulfide (DMS) and ethyl mercaptan (EM) on the as-prepared catalysts were evaluated by means of in-frared spectroscopy. The results showed that the interaction between DMS and the Ag~+ modified potassium titanonio-bates was weaker than that of EM. As the Nb/Ti molar ratio increased, the interaction between the catalyst and DMS (or EM) was strengthen. DMS was converted to sulfoxide, sulfone, and sulfate, and EM was converted to sulfonateand monodentate sulfate under ultra light radiation.