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采用水热法制备CdLa_2S_4,利用CdLa_2S_4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-CdLa_2S_4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-CdLa_2S_4催化剂在可见光(λ>420 nm)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-CdLa_2S_4光催化剂样品中,1%SiC-CdLa_2S_4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-CdLa_2S_4催化剂样品中,随着SiC质量分数的增大,CdLa_2S_4的衍射峰强度逐渐减弱;与此同时在复合SiC-CdLa_2S_4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-CdLa2S4的催化剂活性最高。
CdLa_2S_4 was prepared by hydrothermal method and SiC-CdLa_2S_4 composite photocatalyst with different mass fractions of SiC was prepared by calcination using CdLa_2S_4 and SiC as precursors. The catalysts were characterized by XRD, SEM, PL and PEC. Hydrogen production performance of photocatalytic decomposition of SiC-CdLa_2S_4 catalyst under visible light (λ> 420 nm) was evaluated using photolysis hydrogen production experiment. The experimental results show that 1% SiC-CdLa 2 S 4 photocatalyst has the highest hydrogen production activity in all samples of SiC-CdLa 2 S 4 photocatalyst. Under the visible light irradiation, the rate of hydrogen production by photolysis water reaches 48.2 μmol · h -1, . Because the composite SiC-CdLa_2S_4 catalyst samples, as the SiC mass fraction increases, the diffraction peak intensities of CdLa_2S_4 gradually weakened; at the same time in the composite SiC-CdLa_2S_4 catalyst samples, with the SiC mass fraction increases, SiC Diffraction peak intensity gradually increased. According to the relationship between the intensity of the diffraction peak and the activity of the catalyst, the activity of the catalyst of 1% SiC-CdLa2S4 can be judged to be the highest when the two catalysts are combined and the diffraction peak intensities of the two catalysts are combined.