层状光催化材料H2La2Ti3O10/CdS的制备及其性质研究

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.

Synthesis and Property of H2La2Ti3O10/CdS Layered Nanocomposite Photocatalyst

H_2La_2Ti_3O_ 10/CdS nanocomposite with high photoactivity was synthesized by a stepwise exchange process from H_2La_2Ti_3O_ 10, which was obtained by H+-exchanging reaction of K_2La_2Ti_3O_ 10 with HCl other than the normally used HNO_3. 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 H_2La_2Ti_3O_ 10/CdS, H_2La_2Ti_3O_ 10 and K_2La_2Ti_3O_ 10. It is found that the photoactivity of layered H_2La_2Ti_3O_ 10 is greatly improved by the intercalation of CdS in the interlayer. In general, the excellent photoactivity of the H_2La_2Ti_3O_ 10/CdS nanocomposite might be attributing to the extremely small particle size of incorporated CdS and good contact between CdS and La_2Ti_3O_ 10 2- layers. On the other hand, the coupling of two semiconductor particles with different energy gap is useful to achieve effective charge separation. In H_2La_2Ti_3O_ 10/CdS, a photo-generated electron can transfer from CdS to the La_2Ti_3O_ 10 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.