发光学报, 2016, 37 (1): 7, 网络出版: 2016-03-22  

催化剂SiO2/CNI的制备及其在光解水制氢领域中的应用

Preparation of Composite Catalyst SiC-CdLa2S4 and Its Application in Photocatalytic Decomposition of Water Hydrogen Production
崔玉民 1,2,*师瑞娟 1,2李慧泉 1,2苗慧 1,2
作者单位
1 阜阳师范学院 化学与材料工程学院, 安徽 阜阳236037
2 安徽环境污染物降解与监测省级实验室, 安徽 阜阳236037
摘要
以二氰二胺和碘化铵为前驱体, 采用水浴-焙烧方法首次制备了CNI与SiO2不同质量比的SiO2/CNI复合光催化剂。采用X射线衍射(XRD)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、光致发光光谱(PL)和紫外-可见漫反射光谱(UV-Vis DRS)等对催化剂进行了表征。实验结果表明, 与CNI相比, CNI/SiO2复合光催化剂具有更高的光催化活性。当SiO2与CNI的质量比为1: 15时, SiO2/CNI催化剂样品的光解水产氢活性最高, 光解水产氢速率为88.6 μmol/h。SiO2/CNI(1: 15)样品之所以具有高活性主要有两方面原因: 适量的SiO2与CNI复合可以使光生电子-空穴对的复合得到显著的抑制; SiO2与CNI复合使得SiO2/CNI对可见光(200~600 nm)吸收能力增强, 且其吸收带边向长波方向移动。
Abstract
Using dicyanodiamine and ammonium iodide as the precursors respectively, the SiO2/CNI composite photocatalysts with different mass ratio of SiO2 and CNI were successfully prepared by a bath-calcination process. The samples were characterized by X-ray diffraction(XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy(XPS), photoluminescence(PL) and UV-Vis diffuse reflection spectra(UV-Vis DRS), respectively. The results show that the photocatalytic activity of the SiO2/CNI samples are greatly enhanced, compared with pure CNI. When the mass ratio of SiO2 and CNI is 1: 15, the activity of SiO2/CNI for photolysis water producing hydrogen is the highest, and the rate of photolysis water producing hydrogen of SiO2/CNI reaches 88.6 μmol/h. The enhanced photocatalytic activities can be mainly attributed to the fact that the proper composite of SiO2 and CNI makes the recombination of the photoproduction electronic-hole pair be observably controlled, increases the absorption in 200-600 nm region and the absorption edge has a little shift to long wavelength.

崔玉民, 师瑞娟, 李慧泉, 苗慧. 催化剂SiO2/CNI的制备及其在光解水制氢领域中的应用[J]. 发光学报, 2016, 37(1): 7. CUI Yu-min, SHI Rui-juan, LI Hui-quan, MIAO Hui. Preparation of Composite Catalyst SiC-CdLa2S4 and Its Application in Photocatalytic Decomposition of Water Hydrogen Production[J]. Chinese Journal of Luminescence, 2016, 37(1): 7.

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