吸附法制备 CdS／HKLBT 复合催化材料及其可见光制氢活性

摘要

CdS/HKLBT composite photocatalyst was synthesized by CdS loaded on layer HKLBT via an adsorption method and subsequently characterized by X‐ray diffraction (XRD) , UV‐Vis diffuse reflectance spectroscopy (DRS) ,and transmission electron microscope (TEM ) . The difference of photocatalysts prepared by adsorption and ion exchange methods for photo‐catalytic hydrogen evolution was tested .The influence of amount of CdS loading on photocata‐lytic activity was also investigated .Results showed that CdS on the surface of HKLBT could enhance the photocatalytic activity as well .The CdS/HKLBT composite photocatalyst exhibi‐ted the highest photocatalytic activity for hydrogen evolution when the amount of CdS loading was 15% (mass fraction) ,reaching 532 μmol/h ,near the CdS/HKLBT composite prepared by ion exchange .Excess CdS amount is not benefit for the promotion of photocatalytic activity due to the barrier of the carrier migration between CdS and HKLBT .%采用吸附法制备了 CdS 和层状物的复合光催化材料 CdS／HKLBT （吸附），并采用 X 射线衍射（XRD）、紫外‐可见漫反射（DRS）、透射电子显微镜（TEM ）等技术对其进行了表征和分析。实验对比了吸附法制备的复合材料与离子交换法制备材料活性差异，考察了 CdS 负载量对复合物制氢活性的影响。结果表明，表面复合也能明显提高 CdS 的可见光制氢活性，当 CdS 复合量为15％（质量分数）时活性最高，达到532μmol／h ，与离子交换法制备的光催化剂的产氢速率接近；而过多 CdS 的负载造成载流子迁移的障碍，从而不利于活性的提高。