(中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083)
摘 要: 通過聚合?配合方法和溶膠-凝膠方法，制備了具有層狀鈣鈦礦結(jié)構(gòu)復(fù)合氧化物K2La2Ti3O10光催化劑，采用X射線衍射(XRD)、紫外-可見漫反射光譜(DRS)、掃描電鏡(SEM)等手段進(jìn)行表征；以I-為電子給體，比較了制備方法對K2La2Ti3O10分解水產(chǎn)氫活性的影響。研究結(jié)果表明，溶膠?凝膠法制備的K2La2Ti3O10比聚合?配合法制備的K2La2Ti3O10光催化產(chǎn)氫活性要高出1倍左右，且制備條件友好，所得K2La2Ti3O10具有較好的單相性；獲得了以I-為電子給體，溶膠?凝膠法制備的K2La2Ti3O10分解水的最佳實驗條件：產(chǎn)氫的最佳pH值為11.5，RuO2的負(fù)載量為0.2%~0.3%。
關(guān)鍵字: 溶膠?凝膠法；光催化活性；氫氣
（College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:An ion-exchangeable layered perovskite type oxide, K2La2Ti3O10, was prepared by polymerized complex method and sol-gel method and characterized by XRD, DRS and SEM, et al. The influence of preparation method on the photocatalytic reactivity of K2La2Ti3O10 for hydrogen production was studied while I- was used as electron donor. The optimum condition for water splitting was investigated when K2La2Ti3O10 prepared by sol-gel method was used as photocatalyst. The results show that, the sol-gel method has superiority compared with the polymerized complex method. When K2La2Ti3O10 prepared by sol-gel method is used as photocatalyst for water splitting, the hydrogen production rate is twice of that prepared by polymerized complex. The preparation condition is kind and it is easy to get single phase K2La2Ti3O10 photocatalyst with sol-gel method. When K2La2Ti3O10 is used as photocatalyst with I? as electron donor, the optimum water splitting condition is obtained as follows: pH value is 11.5, the amount of loading RuO2 on K2La2Ti3O10 photocatalyst is 0.2%-0.3%.
Key words: sol-gel method; photocatalytic activity; hydrogen
