中文摘要：

采用水热法制备CdLa2S4，利用CalLa2S4和SiC作为前驱体，采取焙烧法制备了具有不同质量分数SiC的SiC—CdLa2S4复合光催化剂。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、光致发光光谱（PL）和光电化学（PEC）性能测试等对催化剂进行了表征。利用光解水产氢实验，评价了SiC-CdLa2S4催化剂在可见光（A〉420nm）作用下光催化分解水的产氢性能。实验结果表明：在所有的SiC-CdLa2S4光催化剂样品中，l％SiC-CdLa2S4光催化剂具有最高的产氢活性，其在可见光照射下，光解水产氢速率达到48．2μmol·h^-1。因为在复合SiC—CdLa2S4催化剂样品中，随着SiC质量分数的增大，CdLa2S4的衍射峰强度逐渐减弱；与此同时在复合SiC-CdLa2S4催化剂样品中，随着SiC质量分数的增大，SiC的衍射峰强度逐渐增强。根据衍射峰强度与催化剂活性对应关系，两种催化剂复合后，综合二者衍射峰强度可以判断1％SiC—Cd·La2S^4的催化剂活性最高。

英文摘要：

CdLa2S4 was prepared by hydrothermal process. Using CdLaES4 and SiC as the precursors respectively, the SiC-CdLa2S4 composite photocatalysts with various weight contents of SiC were successfully prepared by calcination process. The obtained samples were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, photoluminescence （PL） and photo electro chemical （PEC） technique. With photocatalytic decomposition of water hydrogen production as the experiment, the performance of photocatalytic decomposition of water hydrogen production was evaluated under the visible light. The experimental results showed that in all SiC-CdLa2S4 samples, 1% SiC-CdLa2S4 of photocatalyst had the highest catalytic activity under the visible light, and the rate of photocatalytic decomposition of water hydrogen production could reach 48.2 μmol·h^-1. Because in the composite catalyst samples of SiC-CdLa2S4, with the increase of quality percentage of SiC, the intensity of diffraction peak of CdLa2 S4 weakened gradually, at the same time, in the composite catalyst samples of SiC-CdLa2S4, with the increase of quality percentage of SiC, the intensity of diffraction peak of SiC gradually strengthened. According to the corresponding relationship between the intensity of the diffraction peak and the ac- tivity of the catalyst, after two kinds of catalysts compositing, combining the intensity of diffraction peak of two kinds of catalysts, the composite catalyst of 1% SiC-CdLa2S4 showed the highest catalyst activity.