论文部分内容阅读
以资源丰富的褐煤为原料,经高温石墨化处理后,采用改进的Hummers法制备氧化石墨烯(GO),再以四氯化钛(TiCl_4)为钛源,通过水热合成法制备煤基石墨烯/TiO_2(CRGO/TiO_2)复合材料。利用扫描电镜(SEM)、能谱仪(EDS)、透射电镜(TEM)、X射线衍射仪(XRD)、低温氮气物理吸附仪、傅里叶红外光谱仪(FTIR)对复合材料的微观结构进行系统表征,并重点研究不同GO添加量下所制CRGO/TiO_2复合材料对液相中罗丹明B的光催化降解性能。结果表明:以褐煤为碳质前体,TiCl_4为钛源,采用水热合成法可合成具有介孔特征的煤基石墨烯/TiO_2复合材料,其比表面积可达88.53~169.64m~2/g,孔径主要分布在2~12nm,且随着GO添加量的增加,复合材料的孔径分布逐渐变窄。复合材料中的TiO_2纳米颗粒主要以锐钛矿晶型均匀分散于层状石墨烯表面。GO添加量是影响复合材料光催化降解性能的重要因素。当GO添加量为8%时,CRGO/TiO_2复合材料在可见光下对罗丹明B的降解率可达98.9%。
Based on the rich lignite as raw material, graphite oxide was prepared by high-temperature graphitization, then modified Hummers method was used to prepare graphene oxide (GO), and titanium tetrachloride (TiCl4) was used as titanium source to prepare coal-based graphite by hydrothermal synthesis Olefin / TiO_2 (CRGO / TiO_2) composites. The microstructure of the composites was characterized by SEM, EDS, TEM, XRD, FTIR and Fourier transform infrared spectroscopy (FTIR) Characterization, and focused on the photocatalytic degradation of rhodamine B in liquid phase with different amounts of GO-added CRGO / TiO_2 composites. The results show that coal-based graphene / TiO_2 composites with mesoporous characteristics can be synthesized by hydrothermal method with lignite as carbon precursor and TiCl_4 as titanium source, and the specific surface area can reach 88.53 ~ 169.64m 2 / g , The pore size is mainly distributed in 2 ~ 12nm, and with the addition of GO, the pore size distribution of the composite becomes narrower. The TiO 2 nanoparticles in the composites are mainly dispersed on the surface of layered graphene with anatase crystal. The amount of GO added is an important factor affecting the photocatalytic degradation of composite materials. The degradation rate of rhodamine B in CRGO / TiO_2 composites was 98.9% under the visible light when the addition amount of GO was 8%.