氧化多壁碳纳米管对PVA-CS-O-MWNTs/PAN渗透汽化膜性能的影响

The effects of O-MWNTs on the performances of PVA-CS-O-MWNTs/PAN pervaporation membrane

在涂膜液聚乙烯醇(PVA)-壳聚糖(CS)混合物中加入无机相氧化多壁碳纳米管(O-MWNTs),使用浸渍法涂膜的方式制备PVA-CS-O-MWNTs/PAN中空纤维膜(PAN为聚丙烯腈),应用于渗透汽化分离甲醇(Me OH)/碳酸二甲酯(DMC)混合物.考察了O-MWNTs含量、热处理温度、料液温度对渗透汽化性能的影响.结果表明,加入氧化多壁碳纳米管可以提高PVA-CS/PAN膜的渗透通量、亲水性和机械性能.较佳的工艺条件为:O-MWNTs质量分数为0.1%,热处理温度为80℃,料液温度为40℃,Me OH的质量分数为70%.在此实验条件下,PVA-CS-O-MWNTs/PAN膜的渗透汽化性能达到最佳,渗透通量为210 g·m-2·h-1,甲醇选择性为7.82.

Oxidized multi-wall carbon nanotubes（ O-MWNTs） were used as inorganic nanofillers and added in the coating solution of polyvinyl alcohol （ PVA）-chitosan （CS） mixtures,and the PVA-CS-O-MWNTs/PAN hollow fiber membranes were prepared by the dip-coating method for the pervaporation separation of methanol （MeOH） /dimethyl carbonate （DMC） mixture. The process conditions including the O-MWNTs amount,heat treatment temperature,and feed temperature were investigated in detail. The re-sults indicate that the addition of O-MWNTs can enhance the permeation flux, hydrophilicity and mechanical properties of PVA- CS-O-MWNTs/PAN membranes. The preferable conditions are that O-MWNTs amount,heat treatment temperature,feed tempera- ture,and the concentration of MeOH are 0. 1% ,80 ,40 and 70% Respectively. Thus,the permeation fluxand MeOHselectiv-ity can attain 210 g ·m -2·h -1 and 7. 82 Respectively.