PVC/OHA/D2EHPA基膜增强型聚合物包容膜的制备及性能评价  

Preparation and performance evaluation of PVC/OHA/D2EHPA matrix reinforced polymer inclusion membranes

作　　者：李晨 贾悦 吕晓龙 陈华艳 LI Chen;JIA Yue;LYU Xiaolong;CHEN Huayan(State Key Laboratory of Separation Membranes and Membrane Processes,Tianjin 300387,China;School of Material Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]省部共建分离膜与膜过程国家重点实验室,天津300387 [2]天津工业大学材料科学与工程学院,天津300387

出　　处：《精细化工》2022年第7期1386-1392,共7页Fine Chemicals

基　　金：国家自然科学基金项目(21776216);山东省自然科学重点基金项目(ZR2019LFG007)。

摘　　要：为解决聚合物包容膜(PIM)传输效率低的问题,制备了一种以聚氯乙烯(PVC)为基体,N-羟基正辛酰胺(OHA)和二(2-乙基己基)磷酸酯(D2EHPA)为固、液载体的基膜增强型PIM。OHA作为固体载体固定于基膜孔道内,利用其与D2EHPA的协同作用实现高效传质。对制备的基膜增强型PIM进行了SEM、EDS、FTIR、XPS表征,对其传质性能进行了考察。结果表明,铸膜液组分为22% OHA+17% D2EHPA+61% PVC(百分数均为质量分数)的基膜增强型PIM(M-3膜)对质量浓度为50mg/L的ZnSO_(4)(pH=5.6乙酸缓冲溶液配制)的10 h回收效果最佳,萃取率和反萃率分别为59.86%和51.10%。5个周期的运行实验中,M-3膜的初始传质通量为587.36mg/(m^(2)·h),约是仅包含液相萃取剂PIM(M-1膜)初始传质通量[312.64mg/(m^(2)·h)]的2倍。5个循环周期结束后,M-3膜的传质通量仍高于仅包含液相萃取剂PIM初始传质通量。A novel matrix reinforced polymer inclusion membrane(PIM)was prepared using polyvinyl chloride(PVC)as polymer matrix,N-hydroxy n-octanamide(OHA)and bis(2-ethylhexyl)phosphate(D2EHPA)as solid and liquid carriers for more efficient mass transfer.As a solid carrier immobilized in the pores of PVC matrix,OHA synergizing with D2EHPA were major contributors for improved mass transfer efficiency.The mass transfer performance of matrix enhanced PIM was evaluated following its characterization by SEM,EDS,FTIR,XPS.The results showed that the matrix enhanced PIM(M-3membrane),prepared by casting solution of 22% OHA+17% D2EHPA+61% PVC(mass fraction,the same below),exhibited most effective Zn^(2+)recovery from ZnSO_(4) with initial mass concentration of 50 mg/L by a 59.86% extraction rate and 51.10%stripping rate in a 10-hour operation span.The initial mass transfer flux of M-3 membrane was 587.36 mg/(m^(2)·h),approximately twice that[312.64 mg/(m^(2)·h)]of PIM with only liquid carrier.Moreover,the mass transfer flux of M-3 membrane was higher than the initial mass transfer flux of PIM with only liquid extraction agent even after being recycled 5 times.

关 键 词：萃取 聚合物包容膜 N-羟基正辛酰胺 二(2-乙基己基)磷酸酯 锌离子 功能材料 

分 类 号：TQ028.3[化学工程]