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℃mol/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。
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 ℃mol / 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.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2016年第1期7-12,共6页
Chinese Journal of Luminescence
基金
安徽省自然科学基金(1408085MB35)
安徽省高等学校省级自然科学研究项目(KJ2014A191
2015KJ008)
安徽省高校优秀青年人才基金重点项目(2013SQRL058ZD)资助
关键词
二氰二胺
碘化铵
水浴-焙烧法
SiO2/CNI
光催化
光解水产氢
dicyanodiamine
ammonium iodide
bath-calcination process
SiO2/CNI
photocatalysts
photolysis water producing hydrogen
