微波辅助制备CdS插层K2La2Ti3O10复合物及其光催化制氢的性能

采用微波辅助通过酸交换、胺柱撑、离子交换等步骤制备了CdS插层的K2La2Ti3O10(记做CdS-K2La2Ti3O10)复合光催化剂.利用X射线粉末衍射(XRD),场发射扫描电子显微镜(SEM),紫外-可见漫反射吸收光谱(UV-Vis)和光致发光光谱(PL)等对产物进行表征,考察了CdS-K2La2Ti3O10在紫外光及可见光下催化制氢活性.结果表明,微波辅助法与传统法制备的插层复合催化剂晶型结构相似,同时大大减少了离子交换反应时间,减少了对层间结构的破坏,拓展了催化剂的可见光吸收范围.微波辅助制备的催化剂在紫外光和可见光照射3 h后的产氢量分别为221.53 mmol/(g cat.)和3.23 mmol/(g cat.),并对光催化机理进行了分析.

Synthesis of CdS-pillared K2La2Ti3O10 Catalyst via a Microwave Assisted Process and Its Photocatalytic Property

CdS-pillared K2La2Ti3O10 photocatalysts were synthesized via ion-exchange reaction,bu-tylamine pillaring and sulfuration processes under the assistance of the microwave irradiation.The structure of the photocatalysts was determined by means of powder X-ray diffraction(XRD),scanning electron microscope(SEM),and ultraviolet-visible diffuse reflection spectra(UV-Vis).The photocatalytic activities of these composite compounds for hydrogen production were also investigated under UV and visible light irradiation.The results revealed that the CdS-pillared K2La2Ti3O10 photocatalysts prepared under the assistance of microwave irradiation possess the similar crystal structures with that prepared via a traditional waterlogging method.At the same time,microwave irradiation can greatly decrease the preparation time,resulting in less destruction of the layered structure and improve the absorption for visible light.The photo-catalytic activities for hydrogen production of the CdS-pillared K2La2Ti3O10 photocatalyst prepared via a microwave assisted procedure were 221.53 mmol/(g cat.) and 3.23 mmol/(g cat.) under UV light and visible light irradiation,respectively,after 3 h irradiation.At last,the photocatalysis mechanism was deduced.