基于PEEK-WC双层基膜的正渗透膜的制备
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- 英文论文题名：Preparation of hollow fiber forward osmosis membranes with PEEK-WC support
- 论文作者：宋阳 ; 蒋兰英
- 英文论文作者：SONG Yang ; JIANG Lanying ; School of Metallurgy and Environment ; Central South University ; National Engineering Research Center for Control & Treatment of Heavy Metal Pollution
- 年：2016
- 作者机构：中南大学冶金与环境学院;国家重金属控制与处理工程研究中心;
- 论文关键词：正渗透 ; 通量 ; PEEK-WC基膜 ; 润湿性 ; PDA
- 英文论文关键词：forward osmosis ; water flux ; PEEK-WC support ; wettability ; PDA
- 会议召开时间：2016-11-25
- 会议录名称：第五届全国膜分离技术在冶金工业中应用研讨会论文集
- 语种：中文
- 分类号：TQ051.893
- 学会代码：LXJT
- 会议名称：第五届全国膜分离技术在冶金工业中应用研讨会
- 会议地点：中国湖南长沙
- 主办单位：中国膜工业协会、中南大学
- 学会名称：中国蓝星(集团)总公司膜科学与技术编辑部
- 页数：2
- 文件大小：81k
- 原文格式：O
- 会议级别：全国
摘要
在正渗透膜的制备过程中,支撑层的结构和浸润性对性能有着至关重要的影响。本研究使用PEEK-WC制备双层中空纤维膜,并使用哌嗪(PIP)作为水相单体,均苯三甲酰氯(TMC)作为油相单体,在基膜外表面进行界面聚合,得到正渗透膜.首先分别对基膜的内层和外层进行结构调控,分别探究基膜内层结构不同和外层结构不同对水盐传输性能以及结构参数的影响.研究发现基膜外层孔径增大有利于水的传输性质,水渗透能力从0.9 L/(m~2·h·bar)提高到3.6 L/(m~2·h·bar).同时具有更大外层膜表面孔径基膜得到的界面界面聚合层更加疏松,不利于正渗透的进行,虽然水通量从1.5 L/(m~2·h)提高到2.7 L/(m~2·h),提高了1.8倍,但反向盐通量却从0.9 mol/(m~2·h)提高到5.3 mol/(m~2·h),提高了5.9倍.同时,内层靠近内表面致密层的减少有利于水的传输,正渗透通量从1.5 L/(m~2·h)提高到6.1 L/(m~2·h).同时所制备的正渗透膜对NaCl的截留率较低,只有8%~12%.基于目前的研究,探究使用Na_2SO_4溶液作汲取液,以达到提高截留率的目的.并探究出最佳内层条件,在此基础上使用聚多巴胺(PDA)对基膜内层进行共混改性,探究内层亲水性的提高对水盐传输的影响.最后制备外层孔径一致,而孔结构的对比组,探究外层孔结构对水盐传输性能以及结构参数的影响.
In the process of preparing the forward permeable membrane,the structure and wettability of the support layer have a very crucial influence on the performance.In this study,a novel forward osmosis membrane was prepared by interfacial polymerization using PEEK- WC double-layer hollow fiber membrane as the support,and piperazine(PIP) as the aqueous phase monomer,trimesoyl chloride(TMC)as the oil phase monomer.The structure of inner layer and outer layer were regulated,respectively.To investigate the effects of structure of inner and outer layer on the water and solute transport performance and the structure parameter of the prepared forward osmosis(FO) membrane.The study found that a larger pore size in outer surface is conducive to water transport,as water permeability increased from 0.9 L/(m~2 · h · bar) to3.6 L/(m~2 · h · bar).Meanwhile the interfacial polymerization layer on outer layer with a large pore size is looser which is not conducive to penetration.Although the FO water flux raised from 1.5 L/(m~2· h) to2.7 L/(m~2· h),increased by 1.8 times,the reverse salt flux also raised from 0.9 mol/(m~2· h) to 5.3mol/(m~2· h),increased by 5.9 times.The dense decrease of the inner surface layer near the inner surface is conducive to the water transport,and the FO water flux is increased from 1.5 L/(m~2· h) to 6.1 L/(m~2· h).And the rejection of NaCl was very low,which is only 8%~-12%.Based on the current research,exploring the use of Na_2SO_4 solution as the draw solution to achieve the purpose of high the rejection rate.And based on the best inner layer preparation conditions,using polydopamine(PDA) in the inner membrane as additive to investigate the effect inner layer hydrophilicity on water and salt transport.Finally,preparing a compare group with consistent pore diameter and pore size distribution on outer layer surface and different pore structure in outer layer,to explore the effect of the outer pore structure on the structure parameter and the water and salt transport properties.
In the process of preparing the forward permeable membrane,the structure and wettability of the support layer have a very crucial influence on the performance.In this study,a novel forward osmosis membrane was prepared by interfacial polymerization using PEEK- WC double-layer hollow fiber membrane as the support,and piperazine(PIP) as the aqueous phase monomer,trimesoyl chloride(TMC)as the oil phase monomer.The structure of inner layer and outer layer were regulated,respectively.To investigate the effects of structure of inner and outer layer on the water and solute transport performance and the structure parameter of the prepared forward osmosis(FO) membrane.The study found that a larger pore size in outer surface is conducive to water transport,as water permeability increased from 0.9 L/(m~2 · h · bar) to3.6 L/(m~2 · h · bar).Meanwhile the interfacial polymerization layer on outer layer with a large pore size is looser which is not conducive to penetration.Although the FO water flux raised from 1.5 L/(m~2· h) to2.7 L/(m~2· h),increased by 1.8 times,the reverse salt flux also raised from 0.9 mol/(m~2· h) to 5.3mol/(m~2· h),increased by 5.9 times.The dense decrease of the inner surface layer near the inner surface is conducive to the water transport,and the FO water flux is increased from 1.5 L/(m~2· h) to 6.1 L/(m~2· h).And the rejection of NaCl was very low,which is only 8%~-12%.Based on the current research,exploring the use of Na_2SO_4 solution as the draw solution to achieve the purpose of high the rejection rate.And based on the best inner layer preparation conditions,using polydopamine(PDA) in the inner membrane as additive to investigate the effect inner layer hydrophilicity on water and salt transport.Finally,preparing a compare group with consistent pore diameter and pore size distribution on outer layer surface and different pore structure in outer layer,to explore the effect of the outer pore structure on the structure parameter and the water and salt transport properties.
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