基于碳纳米管?聚丙烯腈纤维支撑层的正渗透膜制备

龙婉晓 王良芥 李玉平 苏春雷

doi:10.12034/j.issn.1009-606X.217193

过程工程学报 >

2017 , Vol. 17 >Issue 6: 1188 - 1194

DOI: https://doi.org/10.12034/j.issn.1009-606X.217193

反应与分离

基于碳纳米管?聚丙烯腈纤维支撑层的正渗透膜制备

龙婉晓王良芥李玉平苏春雷

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1. 湘潭大学化工学院，湖南湘潭 411105；2. 中国科学院过程工程研究所绿色过程与工程重点实验室，北京 100190； 3. 北京市过程污染控制工程技术研究中心，北京 100190

收稿日期: 2017-03-27

修回日期: 2017-04-05

网络出版日期: 2017-12-05

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Fabrication of Forward Osmosis Membranes with CNTs/PAN Fibers Supporting Layer

Wanxiao LONG Liangjie WANG Yuping LI Chunlei SU

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1. School of Chemical Engineering, Xiangtan University, Xiangtan, Hunan 411105, China; 2. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; 3. Beijing Engineering Research Centre of Process Pollution Control, Beijing 100190, China

Received date: 2017-03-27

Revised date: 2017-04-05

Online published: 2017-12-05

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摘要

在聚丙烯腈(PAN)溶液中加入功能化的多壁碳纳米管(f-MWCNTs)，采用静电纺丝法制备纳米纤维多孔支撑层，在其表面通过界面聚合制备超薄聚酰胺截盐层，制得正渗透复合膜，考察了PAN浓度及碳纳米管添加量对膜结构性能的影响. 结果表明，随PAN浓度增大，支撑层纤维直径增大，水通量降低，截盐率增大. 含羧基和羟基的f-MWCNTs可增强膜的亲水性和机械强度，提高膜通量和截盐率. PAN浓度为12%(?)、f-MWCNTs浓度为1.44%(?)时，膜的机械强度可达10.55 MPa，与水的接触角为41.39°，机械强度和亲水性优于未添加碳纳米管的PAN正渗透膜(机械强度3.60 MPa，接触角为61.86°). 以1 mol/L NaCl为汲取液、去离子水为原料液，膜的水通量可达79.1 L/(m2?h)，明显高于商用渗透膜CTA-NW和CTA-ES [8.8和18.4 L/( m2?h)]，溶质反向通量仅为50.4 g/(m2?h).

关键词： 正渗透; 聚丙烯腈; 碳纳米管; 静电纺丝

本文引用格式

龙婉晓王良芥李玉平苏春雷 . 基于碳纳米管?聚丙烯腈纤维支撑层的正渗透膜制备[J]. 过程工程学报, 2017 , 17(6) : 1188 -1194 . DOI: 10.12034/j.issn.1009-606X.217193

Abstract

A thin film forward osmosis (FO) composite membrane with a polyacrylonitrile/multi-walled carbon nanotubes (PAN/f-MWCNTs) substrate via electrospinning was fabricated, the effects of PAN concentration and f-MWCNTs on membrane morphology, hydrophilicity and FO performance were investigated. The results showed that increase of PAN concentration promoted the diameter of nanofiber and decreased water flux and reverse salt flux. The addition of f-MWCNTs improved both the hydrophilicity and mechanical strength. The contact angle of FO memebrane with PAN/f-MWCNTs substrate was 41.39°, much smaller than that of FO memebrane with pure PAN fiber substrate (61.86°), and its mechanical strengths was 10.55 MPa while that of pure PAN fiber substrate was 3.60 MPa. The prepared membrane exhibited a high water flux of 79.1 L/(m2?h) with 1.0 mol/L NaCl as the draw solution and deionized water as feed solution, which surpassed that of two commercial FO membranes [CTA-NW 8.8 L/(m2?h) and CTA-ES 18.4 L/(m2?h)] and reported thin-film composite FO membrane, and also had a low reverse salt flux of 50.4 g/(m2?h).

Key words： forward osmosis; polyacrylonitrile; multi-walled carbon nanotubes; electrospinning fiber

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