化工进展

• 材料科学与技术 • 上一篇    下一篇

三乙酸纤维素正渗透膜的制备与性能

解利昕,辛婧,解奥   

  1. 天津大学化工学院,化学工程联合国家重点实验室,天津市膜科学与海水淡化技术重点实验室,天津 300072
  • 出版日期:2014-10-05 发布日期:2014-10-05

Preparation and properties of cellulose triacetate forward osmosis membrane

XIE Lixin,XIN Jing,XIE Ao   

  1. School of Chemical Engineering and Technology,State Key Laboratory of Chemical Engineering,Tianjin Key Laboratory of Membrane Science and Desalination Technology,Tianjin University,Tianjin 300072,China
  • Online:2014-10-05 Published:2014-10-05

摘要: 以三乙酸纤维素(CTA)为膜材料,1,4-二氧六环、丙酮为溶剂,甲醇、乳酸为添加剂,采用相转换法制备了三乙酸纤维素正渗透膜。研究了不同1,4-二氧六环/丙酮配比、添加剂乳酸含量、挥发时间、膜厚度、热处理温度条件下正渗透膜性能的变化规律。研究表明,当采用纯水为原料液,0.56mol/L CaCl2为汲取液时,优化制备的CTA正渗透膜的水通量达到14.10L/(m2?h),溶质反扩散量为0.031mol/(m2?h);采用0.1mol/L NaCl为原料液,4mol/L葡萄糖为汲取液时,优化制备的CTA正渗透膜的水通量保持在5L/(m2?h)以上,对NaCl的截留率大于99%。CTA正渗透膜相比于HTI膜,具有较高的亲水性、水通量、截留率,稳定性更好。

关键词: 正渗透, 膜, 分离, 选择性, 三乙酸纤维素

Abstract: Cellulose triacetate based membranes for forward osmosis were prepared by immersion precipitation. The polymer solution consisted of cellulose triacetate as the membrane material,1,4-dioxane and acetone as solvent,methanol and lactic acid as additives. Casting composition and preparation conditions—1,4-dioxane/acetone ratio,lactic acid content,evaporation time,casting thickness and annealing temperature—were tested for their effects on membrane performance. The optimized membrane showed 14.10L/(m2?h) water flux and 0.031mol/(m2?h) reverse solute flux using a feed solution of pure water and draw solution of 0.56mol/L CaCl2. When 0.1mol/L NaCl was used as the feed solution and 4mol/L glucose was used as the draw solution,water flux was above 5L/(m2?h) and rejection for NaCl was above 99%. The optimized membrane had a more hydrophilic surface,higher water flux,higher salt resistance and better membrane performance than the HTI membrane.

Key words: forward osmosis, membranes, separation, selectivity, cellulose triacetate

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn