插层法制备g-C_3N_4/高岭石复合材料及其光学性能  

Preparation of g-C_3N_4/kaolinite Composite by Intercalation Method and Its Optical Performance

作　　者：程宏飞[1] 杜贝贝[1] 孙志明[2] 李春全[2] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《人工晶体学报》2017年第7期1258-1262,1266,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(41602171);北京市自然科学基金(8164062);北京市科技新星计划(2015B081)

摘　　要：高岭石表面与层间具有较高的活性和良好的规范性,因而适合对其进行化学修饰,在催化剂负载方面值得深入研究。本文以甲氧基嫁接的高岭石为前躯体,采用置换插层法制备出高岭石/三聚氰胺插层复合物,进一步在550℃煅烧获得g-C_3N_4/高岭石复合光催化剂。利用X射线衍射、傅里叶红外和热重-差热分析等手段对复合光催化材料进行表征,并对其光催化性能进行研究。结果表明,当高岭石与光催化剂前驱体三聚氰胺质量比为1∶1和1∶2时,较难缩聚得到g-C_3N_4;然而,当高岭石与三聚氰胺质量比为1∶3、1∶4、1∶5时,可获得不同g-C_3N_4占比的复合材料,其整体分散状况因高岭石的加入而有效改善,这表明高岭石的加入能有效避免g-C_3N_4的团聚。所制备的高岭石负载石墨相氮化碳光催化材料具有较好的光学性能,在探索经济、高效、绿色矿物基复合光催化剂方面研究具有重要意义。The surface and the interlayer of kaolinite has high activity and good normality which is so suitable for chemical modification,hence,the catalyst loading is worthy of in-depth study. Using methoxy-grafted kaolinite as precursor, the kaolinite-melamine composites were prepared by the displacement intercalation method. Then the kaolinite-melamine composite materials was calcined in the 550 ℃ to obtain the g-C3N4/kaolinite composite materials. The prepared composites were characterized by X-ray diffraction（ XRD）,Fourier transform infrared spectroscopy（ FTIR） and thermogravimetry and differential scanning calorimetry（ TG-DSC）,and their photocatalytic performance were also studied. It is indicated that it is difficult to synthesize g-C3N4 when kaolinite-melamine ratios are 1 ∶ 1 and 1 ∶ 2; while the composites with different ratios of g-C3N4 will be get when the mass ratio of kaolinite and melamine is 1∶ 3,1∶ 4 and 1∶ 5,respectively. Kaolinite can effectively prevent the reunion of g-C3N4,and improved dispersion condition can be obtained due to the addition of kaolinite. The prepared g-C3N4/kaolinite composites have good photocatalytic performance which has great significance in the research of mineral based economic,efficient and green catalyst.

关 键 词：高岭石 g-C3N4 插层法 结构 光催化性能 

分 类 号：X703[环境科学与工程—环境工程]