层状光催化材料H_2La_2Ti_3O_(10)/CdS的制备及其性质研究  

Synthesis and Property of H_2La_2Ti_3O_(10)/CdS Layered Nanocomposite Photocatalyst

作　　者：张莉莉[1,2] 刘冠鹏[1] 张维光[1,2] 陆路德[1] 杨绪杰[1] 汪信[1] 

机构地区：[1]南京理工大学化工学院材料化学实验室 [2]淮阴师范学院化学系,江苏淮安223001

出　　处：《中国稀土学报》2006年第2期168-173,共6页Journal of the Chinese Society of Rare Earths

基　　金：江苏省高校研究生创新研究计划项目;江苏省高校自然科学研究指导性计划项目(04KJD150034);江苏省淮安市科技计划项目(HAG04043;HAG05039)

摘　　要：通过改善酸交换过程,用分步柱撑法制备了一种新的层柱材料H2La2Ti3O10/CdS。用X射线粉末衍射(XRD)、红外光谱(IR)、比表面(BET)等方法对材料进行了表征;以光催化降解苯胺为探针对材料的活性进行了研究。结果表明:通过柱撑CdS,H2La2Ti3O10的光催化性能得到明显提高;同时,对试验条件进行了优化,得到了最佳催化反应条件。H2La2Ti3O10/CdS nanocomposite with high photoactivity was synthesized by a stepwise exchange process from H2La2Ti3O10, which was obtained by H^＋- exchanging reaction of K, H2La2Ti3O10 with HCI other than the normally used HNO3. The pillaring process was investigated by XRD, TEM, FT-IR, and BET methods.The photocatalytic decomposition of aniline was used as the model system to evaluate the photochemical properties of H2La2Ti3O10/CdS H2La2Ti3O10 and H2La2Ti3O10. It is found that the photoactivity of layered H2La2Ti3O10 is greatly improved by the intercalation of CdS in the interlayer. In general, the excellent photoactivity of the H2La2Ti3O10/CdS nanocomposite might be attributing to the extremely small particle size of incorporated CdS and good contact between CdS and La2Ti3O10^2- layers. On the other hand, the coupling of two semiconductor particles with different energy gap is useful to achieve effective charge separation. In H2La2Ti3O10/CdS, a photo-generated electron can transfer from CdS to the H2La2Ti3O10^2- layer, while the holes remain in the CdS particles. This helps to diffuse the electrons and holes before reaching the interface, and the holes and electrons can be effectively captured by the electrolyte in the solution. Simultaneously, the optimal operating condition of photodecomposition aniline was investigated.

关 键 词：镧钛酸盐 柱撑 苯胺 光降解 稀土 

分 类 号：O614.1[理学—无机化学]