膜法制备g-C_3N_4/CdS复合光催化剂及其光催化降解性能研究

Membrance Synthesis of g-C_3N_4/CdS Composites with Enhanced Photocatalytic Properties and Analysis of Photocatalysis Degradation Dharacteristic

采用高温聚合有机物前驱体的方法,以三聚氰胺为前驱体,制得了类石墨型氮化碳(g-C_3N_4)粉末。以硫化钠、氯化镉和制得的g-C_3N_4为前驱体,通过膜法制备了g-C_3N_4/CdS复合光催化剂。利用X射线衍射(XRD)和扫描电镜(SEM)等对催化剂的结构和形貌进行了表征,并结合降解活性艳红(X-3B)的实验评价了催化剂的光催化活性。研究结果表明:采用膜法制备显著增强了光催化剂的活性;与纯CdS相比,g-C_3N_4/CdS复合光催化剂光催化活性明显增强,其中(CdS/g-C_3N_4)2:1光催化活性最强。

In this paper, the graphite-type carbon nitride （g-C3N4） was prepared by using high temperature poly- merization of organic precursors and melamine as precursors. The g-C3N4/CdS composite photocatalysts was prepared by membrane method using sodium sulfide, cadmium chloride and g-C3 N4 as precursors. The catalysts were characterized by XRD and SEM. X-3B dye was selected as the organic pollutant to evaluate the photocatalytic activity of the catalysts.The result showed that the photocatalytic activity of g-C3N4/CdS were enhanced significantly by membrane synthesis. The g-C3N4-CdS showed better photocatalytic activity than CdS. The photocatalytic activity of （CdS/C3N4 ）2 ： 1 was best.