掺杂石墨相氮化碳高通量芳香聚酰胺超滤膜制备

Preparation of High Flux Aromatic Polyamide Ultrafiltration Membrane Doped with Graphitic Carbon Nitride

以聚间苯二甲酰间苯二胺(PMIA)为膜材料,石墨相氮化碳(g-C3N4)为添加剂,通过相转化法制备了PMIA/g-C3N4超滤膜。分别探讨了不同添加量的g-C3N4对超滤膜的水通量、分子截留性能等影响。结果表明,与不含gC3N4的超滤膜相比,改性后的超滤膜的结构和性能发生了显著变化,添加一定比例的g-C3N4纳米粒子可以有效增加膜的通量和亲水性,但过量的添加会影响膜的分离性能。研究发现,当添加的g-C3N4的量相对于PMIA的质量分数为5%时,膜的整体性能最佳,此添加量的膜的纯水通量达到了542 L/(m^2·h),截留分子量Mm为133.3×10^3,表面纯水接触角为48.36°,孔隙率为67.10%,裂解温度为360℃。

PMIA/g-C3 N4 ultrafiltration membranes with poly(m-phenylene isophthalamide)(PMIA)as the membrane material and graphitic carbon nitride(g-C3 N4)as additive were prepared by phase inversion method.The effects of different amounts of g-C3 N4 on the pure water flux and molecular rejection of the ultrafiltration membrane were investigated.The results showed that the structure and properties of the modified ultrafiltration membrane were significantly changed compared with the ultrafiltration membrane without g-C3 N4.The addition of a certain proportion of g-C3 N4 nanoparticles could effectively increase the flux and hydrophilicity of the membrane,but excessive addition would affect the separation performance of the membrane.The study found that when the addition amounts of g-C3 N4 nanoparticles was 5%relative to the mass fraction of PMIA,the overall performance of the membrane was optimal,and the pure water flux of the membrane reached 542 L/(m^2·h),molecular weight cut-off Mm was 133.3×10^3,contact angle of pure water surface was 48.36°,porosity was 67.10%and pyrolysis temperature was 360℃.