Molecular Catalysis ( IF 4.6 ) Pub Date : 2020-03-10 , DOI: 10.1016/j.mcat.2020.110874 Salwa Hussein Ahmed , Maram Bakiro , Fatma Ibrahim Abdulla Aljasmi , Aseilah Mohamed Obaid Albreiki , Safae Bayane , Ahmed Alzamly
CeO2 and CeO2/rGO composites photocatalysts has been prepared using simple coprecipitation method. The effect of rGO on structural surface morphology and optical properties of the prepared photocatalysts was characterized using diffuse reflectance spectroscopy (DRS), powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller for determination of the specific surface area/ porosity (BET). All prepared photocatalysts exhibits fluorite-type structure with no phase change up to 5 wt percent rGO when calcinated at 700 °C for 1 h. A red shift in optical band gap measurements was observed with increasing rGO percent. Photocatalytic performance of prepared photocatalysts were examined using visible-light-induced photocatalytic reduction of 4-nitroaniline to p-phenylenediamine. The highest photocatalytic efficiency was achieved using CeO2 photocatalyst with 5 wt percent rGO.
中文翻译:
CeO 2 / rGO复合材料的带隙和光催化性能的研究
采用简单的共沉淀法制备了CeO 2和CeO 2 / rGO复合光催化剂。使用扩散反射光谱(DRS),粉末X射线衍射(PXRD),扫描电子显微镜(SEM)和Brunauer-Emmett-Teller来测定rGO对制备的光催化剂的结构表面形态和光学性质的影响。比表面积/孔隙率(BET)。所有制备的光催化剂均显示萤石当在700°C下煅烧1 h时,r型相结构的相变不超过5%rGO。随着rGO百分比的增加,观察到了光学带隙测量的红移。使用可见光诱导的4-硝基苯胺将光催化还原为对苯二胺来检查制备的光催化剂的光催化性能。使用具有5 wt%rGO的CeO 2光催化剂可获得最高的光催化效率。