类石墨氮化碳/伊利石复合材料的制备及其可见光催化性能

摘要

以伊利石为载体、双氰胺(C2H4N4)为类石墨氮化碳(g-C3N4)前驱体,采用液相浸渍-热聚合联合工艺制备出一种可见光响应的g-C3N4/伊利石光催化复合材料.利用 XRD、FESEM、AFM、UV-Vis、BET 及 PL 对样品的微观结构、界面特性及光学性能进行检测分析,同时考察g-C3N4/伊利石光催化复合材料在可见光照射下光催化降解环丙沙星(CIP)的效果.结果表明:相比纯 g-C3N4,g-C3N4/伊利石复合材料在可见光下具有更高的光催化性能,其光催化速率是纯g-C3N4的 1 1.2 6 倍;伊利石与g-C3N4构成的复合结构能够有效地抑制光生载流子的复合,改善了纯g-C3N4材料的吸附性能和光催化活性.%Using illite as carrier and dicyandiamide(C2H4N4)as g-C3N4precursor,a novel visible light responding g-C3N4/illite photocatalytic composite was prepared through chemical impregnation combined with thermal polymer-ization technique.The microstructure,interface and optical properties of the obtained photo-catalytic composites were characterized by XRD、FESEM、AFM、UV-Vis、BET and PL.In addition,using ciprofloxacin(CIP)as the target pollutant,the photo-catalytic activity of photo-catalytic composite was evaluated under visible light.The re-sults indicate that the as-synthesized g-C3N4/illite sample exhibits significantly enhanced photocatalytic activity under visible-light irradiation,whose reaction constant rate is almost 1 1.26 times that of the pure g-C3N4.The g-C3N4nanoshe-ets are firmly attached on the surface of illite,which could effectively inhibit the recombination of photogenerated carriers and then further improve the adsorption capacity and photoactivity of g-C3N4photocatalyst.