木质素磺酸钠改性聚砜膜的制备及其在正渗透膜中的应用

吴青芸; 潘叶寒; 金伟中; 徐佳敏; 劳侃侃; 顾林

doi:10.11777/j.issn1000-3304.2017.16267

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木质素磺酸钠改性聚砜膜的制备及其在正渗透膜中的应用

研究论文 | 更新时间：2021-03-19

- 木质素磺酸钠改性聚砜膜的制备及其在正渗透膜中的应用
- Preparation of Sodium Lignin Sulfonate Modified Polysulfone Membranes and Their Use as Supports for Forward Osmosis Membranes
- 高分子学报 2017年第5期页码：851-857
- 作者机构：
  
  1.宁波大学材料科学与化学工程学院宁波 315211
  2.中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室宁波 315201
- 作者简介：
  
  吴青芸, E-mail:wuqingyun@nbu.edu.cnQing-yun Wu, E-mail:wuqingyun@nbu.edu.cn
  顾林, E-mail:gulin1985@gmail.comLin GuE-mail:gulin1985@gmail.com
- 基金信息：
  
  国家自然科学基金(51403107);国家自然科学基金(21404112);宁波市自然科学基金(2015A610014);中国科学院海洋新材料与应用技术重点实验室开放课题(2016K07)
- DOI：10.11777/j.issn1000-3304.2017.16267
  中图分类号：
- 纸质出版日期：2017-5，
  
  收稿日期：2016-9-1，
  
  修回日期：2016-9-23，
扫描看全文
吴青芸, 潘叶寒, 金伟中, 徐佳敏, 劳侃侃, 顾林. 木质素磺酸钠改性聚砜膜的制备及其在正渗透膜中的应用[J]. 高分子学报, 2017,(5):851-857.

Qing-yun Wu, Ye-han Pan, Wei-zhong Jin, Jia-min Xu, Kan-kan Lao, Lin Gu. Preparation of Sodium Lignin Sulfonate Modified Polysulfone Membranes and Their Use as Supports for Forward Osmosis Membranes[J]. Acta Polymerica Sinica, 2017,(5):851-857.
吴青芸, 潘叶寒, 金伟中, 徐佳敏, 劳侃侃, 顾林. 木质素磺酸钠改性聚砜膜的制备及其在正渗透膜中的应用[J]. 高分子学报, 2017,(5):851-857. DOI： 10.11777/j.issn1000-3304.2017.16267.

Qing-yun Wu, Ye-han Pan, Wei-zhong Jin, Jia-min Xu, Kan-kan Lao, Lin Gu. Preparation of Sodium Lignin Sulfonate Modified Polysulfone Membranes and Their Use as Supports for Forward Osmosis Membranes[J]. Acta Polymerica Sinica, 2017,(5):851-857. DOI： 10.11777/j.issn1000-3304.2017.16267.

摘要

采用木质素磺酸钠作为亲水添加剂，通过浸没沉淀相转化法制备了木质素磺酸钠共混改性聚砜膜，以改善聚砜膜的亲水性，并用作正渗透膜的支撑层，以降低内浓差极化效应.利用扫描电子显微镜、衰减全反射傅里叶变换红外光谱仪、水接触角仪等研究了不同木质素磺酸钠添加量对聚砜膜的结构和表面性质的影响.结果表明，添加木质素磺酸钠后，聚砜膜的指状孔变得规整且狭长.水接触角实验证实添加木质素磺酸钠能改善聚砜膜的亲水性，当木质素磺酸钠含量为0.4 wt%时，聚砜膜的表面水接触角可降低至65°.正/反渗透测试装置分别用于表征正渗透膜的传质性质和结构参数.结果表明，以0.4 wt%木质素磺酸钠改性聚砜膜为支撑层的正渗透膜的水渗透性能（

=3.12×10

-5

LMH·Pa

-1

）优于纯聚砜基底正渗透膜（0.76×10

-5

LMH·Pa

-1

），而且前者的结构参数（

=2010μm）远小于后者（3450μm），说明木质素磺酸钠改性聚砜膜有效弱化了正渗透膜的内浓差极化效应.

Abstract

Forward osmosis (FO) becomes an emerging and promising platform of membrane separation technology. Nevertheless

FO processing always suffers from poor water flux performance

resulted from internal concentration polarization (ICP). Herein

to improve the hydrophilicity of polysulfone (PSf) membranes

sodium lignin sulfonate (LS) was used as a hydrophilic additive to prepare LS/PSf blend membranes by phase inversion. The LS/PSf blend membranes can serve as the hydrophilic support layer of FO membranes in order to weaken the ICP. The effects of LS content on the structure and the properties of LS/PSf blend membranes were investigated by scanning electron microscopy (SEM)

FTIR/ATR spectroscopy

and water contact angle (WCA). It was shown that the finger-like pores of LS/PSf blend membranes became long and narrow

and the WCA of the membrane was reduced to 65° with LS content of 0.4 wt%. Then

thin film composite (TFC) membranes were fabricated by interfacial polymerization on PSf membrane and LS/PSf blend membrane with LS content of 0.4 wt%

which were named TFC and TFC-LS0.4 membranes

respectively. The results from FTIR/ATR spectroscopy and SEM confirmed that polyamide (PA) films were formed with a typical "ridge-valley" surface morphology on both TFC and TFC-LS0.4 membranes. Moreover

the PA film of TFC-LS0.4 membrane was rougher and thicker than that of TFC membrane. Their FO performances were characterized by FO test

where the draw solution was 0.5

1.0

1.5 or 2.0 mol/L NaCl solution

and the feed solution was DI water. The water flux and reverse salt flux increased with the concentration of draw solution both for TFC and TFC-LS0.4 membranes. With the same draw solution

TFC-LS0.4 membrane showed a larger water flux and reverse salt flux than TFC membrane. Furthermore

reverse osmosis test was conducted to study the transport properties and structural parameters of FO membranes. It is clear that TFC-LS0.4 membrane presented higher water permeability (

=3.12×10

-5

LMH·Pa

-1

) with smaller structural parameter (

=2010μm) than TFC membrane (

=0.76×10

-5

LMH·Pa

-1

=3450μm). It means that the hydrophilicity of LS/PSf blend membranes facilitated the weakening of ICP effects of FO membranes.

关键词

木质素聚砜亲水改性正渗透膜内浓差极化

Keywords

LigninPolysulfoneHydrophilic modificationForward osmosis membraneInternal concentration polarization

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