多功能GO/g-C3N4/Ag复合膜的制备及性能研究

Fabrication and performance evaluation of multifunctional GO/g-C3N4/Ag composite membrane

采用真空辅助抽滤的方法制备了自支撑的氧化石墨烯复合膜,对其形态和结构进行表征,并以R6G溶液为目标污染物,考察了复合膜的水通量、R6G(罗丹明6G)截留率、SERS(表面增强拉曼光谱)检测性能及光催化降解性能.结果表明,g-C3N4(石墨相氮化碳)和Ag纳米颗粒成功嵌入GO片层之间,制备出GO/g-C3N4/Ag复合膜,膜厚度约为4.2μm,水通量为230.64 L/(m^2·h·MPa),R6G截留率达到91.27%;复合膜通过SERS技术能实现对R6G的快速、高灵敏度检测,检测浓度可低至10 nmol/L;复合膜光催化降解性能良好,可见光下反应2 h后R6G降解率可达97.05%.GO/g-C3N4/Ag复合膜具有吸附分离、SERS检测及光催化降解等多种功能,改善了GO膜的渗透通量低、不可重复利用等问题,可用于水中有机污染物的检测及降解.

In this paper,a freestanding graphene oxide composite membrane(GO/g-C3N4/Ag membrane)was fabricated by facile vaccum filtration.Characterizations on its morphology and structure were then carried out.The water flux,rejection rate,SERS detection activity and photogradation performance of GO/g-C3N4/Ag membrane were respectively evaluated by treating R6G solutions.The GO/g-C3N4/Ag membrane has a thickness of about 4.2μm.With intercalation of g-C3N4 and AgNPs into GO nanosheets,the GO/g-C3N4/Ag membrane exhibits high water flux of 230.64 L/(m^2·h·MPa)and rejection rate of 91.27%.SERS detection was conducted after filtering R6G solution through the GO/g-C3N4/Ag membrane,and it was detectable with the concentration of as low as 10 nM.The GO/g-C3N4/Ag membrane also exhibits high photocatalytic activity with degradation rate of 97.05%after irradiation of 2 h.This multifunctional GO composite membrane overcome the deficiency of low permeation flux and non-recyclability of pure GO membrane,indicating a great potential in treating organic pollutants.