聚乙烯亚胺改性多壁碳纳米管用于制备高通量复合纳滤膜

PEI modified MWCNTs used to prepare high-throughput composite nanofiltration membranes

以聚砜(PSf)超滤膜为基膜,聚乙烯亚胺(PEI)为水相单体,均苯三甲酰氯(TMC)为有机相单体,将聚乙烯亚胺改性的多壁碳纳米管(MWCNTs-PEI)添加至水相中,采用界面聚合法制备了有机无机杂化复合纳滤膜.分析和表征了改性多壁碳纳米管的微观形貌、化学性质和分散性及其改性后的纳滤膜的微观结构、红外光谱和接触角,讨论了MWCNTs-PEI添加量对膜性能的影响.结果表明,当改性多壁碳纳米管的添加量为100mg/L时,制备的复合纳滤膜水通量能达到119.5L/(m^(2)·h·MPa),MgCl_(2)的截留率为94.4%.同时,该复合纳滤膜对4种常见的商业染料的截留率均约为98%.

Polyethyleneimine modified multi-walled carbon nanotubes were prepared,using polysulfone ultrafiltration membrane,polyethyleneimine and trimesoyl chloride as the base membrane,water phase monomer,and organic phase monomer,respectively.Modified multi-walled carbon nanotubes were added into the water phase,and the organic-inorganic hybrid composite nanofiltration membrane was prepared by the interfacial polymerization method.The microscopic morphology/chemical properties and dispersion properties of the modified multi-walled carbon nanotubes were analyzed and characterized.The microstructure,infrared spectrum and contact angle of the base membrane and nanofiltration membrane were analyzed and characterized,and the influence of the addition amount of polyethyleneimine modified multi-walled carbon nanotubes on the membrane performance was discussed.The results show that the water flux of the composite nanofiltration membrane with 100 mg/L modified multi-walled carbon nanotubes can reach 119.5 L/(m^(2)·h·MPa),and the rejection rate of MgCl_(2) is 94.4%.At the same time,the rejection rate for the four common commercial dyes is about 98%.