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.
出处
《中国稀土学报》
CAS
CSCD
北大核心
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)
关键词
镧钛酸盐
柱撑
苯胺
光降解
稀土
layered lanthanum titanate
pillaring
aniline
photodecomposition
rare earths
