g-C_(3)N_(4)/MXene@Ag多功能膜制备及其水净化性能研究

Study on the preparation of an advanced g-C_(3)N_(4)/MXene@Ag multifunctional membranes and their properties for water purification

通过真空辅助组装构建g-C_(3)N_(4)/MXene@Ag(CNMA)分离膜。研究表明,银纳米粒子的引入可以增强表面润湿性并优化传质通道,复合膜最高分离通量(对水包1,2-二氯乙烷乳液)为(6812.7±106)L m^(-2)h^(-1)bar^(-1),最大效率可达99.7%。值得注意的是,CNMA复合膜具有显著的抗污能力,在连续使用10次后仍保持稳定的分离性能。此外,MXene@Ag材料能够优化复合膜体系的能带结构,促进电子-空穴(e^(-)-h^(+))的有效空间分离,从而改善光电性能,实现对有机污染物(染料、抗生素)的高效去除,其中对亚甲基蓝染料的降解效率为98%。CNMA分离膜适用于有机污染物场景下的水环境修复,满足实际污水处理要求,具有十足的发展前景。

The g-C_(3)N_(4)/MXene@Ag(CNMA)separation membrane was constructed by vacuum-assisted self-assembly.It is shown that the introduction of Ag nanoparticles can optimize the surface wettability and transport channels of the membranes.The separation flux(for 1,2-dichloroethane/water emulsions)of the composite membrane is up to(6812.7±106)L/(m^(2)·h·bar)with a maximum separation efficiency of 99.7%.Notably,the CNMA separation membrane has remarkable anti-fouling performance and maintains stable separation properties after 10 consecutive uses.In addition,MXene@Ag can enhance the energy band structure,improve the photoelectric properties,provide positive spatial separation of electrons-holes(e^(-)-h^(+))and achieve efficient removal of organic pollutants(dyes,antibiotics).The efficiency of the membrane in degrading methylene blue dye is 98%.The CNMA functional separation membrane is suitable for water environment remediation under organic pollutant scenarios.This work meets the actual wastewater treatment requirements and has a promising development.