MWNTs-Ag^+/壳聚糖膜渗透汽化分离苯/环己烷

Separation of benzene/cyclohexane mixtures through mixed matrix membranes of MWNTs-Ag^+ and chitosan

采用异烟酸与酸化后的多壁碳纳米管(MWNTs)发生酯化反应,将Ag+与酯化后的MWNTs上的吡啶环发生络合反应,使MWNTs接上Ag+.改性后的MWNTs与壳聚糖共混制备以聚砜为底膜的复合杂化膜.用FT-IR、TEM和XPS表征改性后的MWNTs以证实MWNTs上接了Ag+.并且利用SEM观察复合杂化膜的表面与断面.通过渗透汽化实验的结果表明:MWNTs-Ag+/壳聚糖杂化膜的分离性能优于MWNTs/壳聚糖杂化膜,并且随着Ag+质量分数的增加,渗透通量J增加,分离因子先增加后减小,当膜中MWNTs-Ag+相对于壳聚糖的质量比为1.5%时,分离因子α达到最大值为30.88,通量为237.78g/(m2·h)(苯质量分数为10%,温度为20℃).

This study was designed to prepare functionalized multiwalled carbon nanotubes（MWNTs-Ag^＋）incorporated chitosan membrane for separation of benzene/cyclonexane mixtures by pervaporation.Ag^＋was grafted to the pyridine ring on the MWNTs by a complexation reaction. Membranes made of chitosan and Ag^＋/carbon nanotubes were prepared with polysulfone membranes as support.The surface structure of modified MWNTs was examined by FT-IR,TEM and XPS to assess its morphology.Pervaporation results showed that the MWNTsAg^＋/chitosan hybrid membrane separation performance is better than MWNTs/chitosan hybrid membrane and pristine chitosan membrane.The permeation flux of the membranes were increased,the separation factors were increased firstly and then decreased with the increased of the content of MWNTs-Ag^＋.The separation factor reached 30.88 and the permeate flux was237.78g/（m^2·h）（the mass ratio of benzene was 10%,the temperature is 20℃）when the mass ratio of the MWNTs-Ag^＋to chitosan was 1.5%.