Abstract: A polymer inclusion membrane (PIM) system containing polyvinyl chloride (PVC) polymer matrix and bis(2-ethyl hexyl)-phosphoric acid (D2EHPA, P204), as a specific carrier, was prepared without using any additional plasticizers, expressed as PD-PIM. The chemical composition, crystallization behavior and morphology of as-prepared PD-PIM were characterized with Fourier transform infrared spectrophotometry, X-ray diffraction and atomic force microscopy. The facilitated transport of phenol through the PD-PIM was investigated. The influences of carrier content of PD-PIM, phenol concentration, pH in source phase, and HCl concentration in receiving phase on the transport were investigated. The transport kinetics of phenol and the stability of membranes were studied. The results show that the early transmission process of phenol is in line with the first order kinetic equation and the optimal transport process can be obtained with the membrane containing 70%D2EHPA/30%PVC (mass), from the source solution of phenol concentration at 400 mg·L^-1 and pH 6.0, by using 0.1 mol·L^-1 HCl as receiving phase. In addition, the experiments demonstrate that PD-PIM presents good stability and the phenol transport through the membrane is facilitated by co-transport.

Key words: inclusion membrane, phenol, D2EHPA, separation, permeation, extraction

摘要： 以二-(2-乙基己基) 膦酸(D2EHPA,P204)为载体,制备了聚氯乙烯(PVC)为膜基材的系列聚合物包容膜(PD-PIM),用FTIR、XRD及AFM表征了PD-PIM的化学组成、结晶行为和微观形貌.以渗透系数和渗透通量为指标,考察了PD-PIM膜中载体含量、料液相浓度和pH,以及解析相中盐酸浓度对PD-PIM分离苯酚的影响,探讨了实验条件下苯酚通过PD-PIM的传输机制.结果表明:在实验设定的范围内,PD-PIM对苯酚的传质通量随PD-PIM中载体质量分数、料液相中苯酚浓度的增加而增大,并在料液相苯酚浓度为400 mg·L^-1、pH=6,解析相盐酸浓度为0.1 mol·L^-1,载体P204含量为70%(质量)时达到最佳分离效果.PD-PIM对苯酚的传输机制为促进耦合迁移,初期传输符合一级动力学方程.重复使用实验证实PD-PIM具有较高的稳定性.

关键词: 聚合物包容膜, 苯酚, 二-(2-乙基己基) 膦酸, 分离, 渗透, 萃取