高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (9): 2033-2040.doi: 10.7503/cjcu20190104

• 高分子化学 • 上一篇    

反渗透膜微结构的调控及海水脱硼性能的提升

谢欣1,张潇1,李蕊含1,宋潇潇1,2,刘立芬1,2,*(),高从堦1,2   

  1. 1. 浙江工业大学膜分离与水科学技术中心, 海洋学院
    2. 浙江省膜分离与水处理协同创新中心, 杭州 310014
  • 收稿日期:2019-02-16 出版日期:2019-09-10 发布日期:2019-09-09
  • 通讯作者: 刘立芬 E-mail:lifenliu@zjut.edu.cn
  • 基金资助:
    国家自然科学基金(21776253, 21774077);浙江省重点研发计划项目(2019C03094)

Microstructure Regulation of the Reverse Osmosis Membrane to Improve the Boron Removal Performance

XIE Xin1,ZHANG Xiao1,LI Ruihan1,SONG Xiaoxiao1,2,LIU Lifen1,2,*(),GAO Congjie1,2   

  1. 1. Center for Membrane and Water Science and Technology, Ocean College, Zhejiang University of Technology
    2. Collaborative Innovation Center of Membrane Separation and Water Treatment of Zhejiang Province,Hangzhou 310014, China
  • Received:2019-02-16 Online:2019-09-10 Published:2019-09-09
  • Contact: LIU Lifen E-mail:lifenliu@zjut.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21776253, 21774077);the Key R&D Program of Zhejiang Province, China(2019C03094)

摘要:

通过引入聚乙烯亚胺(PEI)链与对叠氮苯甲酸(ABA)分子对薄层芳香聚酰胺复合反渗透膜(TFC)进行接枝改性, 采用傅里叶衰减全反射红外光谱(ATR-FTIR)和X射线光电子能谱(XPS)分析了反渗透膜活性分离层的化学组成和结构, 用静态水接触角仪与Zeta电位仪测试了反渗透膜表面的亲疏水性和电荷性质, 并利用扫描电子显微镜(SEM)及原子力显微镜(AFM)观察其表面形貌, 测试了反渗透膜在苦咸水与海水条件下的分离性能. 实验结果表明, 使用PEI与ABA对反渗透膜改性后, 提升了其分离层的致密度, 使硼渗透通过反渗透膜时的传质阻力变大, 从而将改性反渗透膜(TFC-PEI-ABA)对硼的截留率提升至90.45%, 达到了世界卫生组织对水质的要求.

关键词: 反渗透复合膜, 聚乙烯亚胺, 对叠氮苯甲酸, 海水脱硼

Abstract:

Thin aromatic polyamide composite reverse osmosis membranes(TFC) were modified by grafting polyethyleneimine(PEI) chains and 4-azidobenzoic acid(ABA) molecules. Attenuated total reflectance Fourier transform infrared spectroscopy(ATR-FTIR) and X-ray photoelectron spectroscopy(XPS) were used to analyze the chemical composition and structure of the active separation layer. Then the hydrophobicity and charge of the reverse osmosis membrane were measured by static water contact angle instrument and Zeta potentiometer, the surface morphology was observed by scanning electron microscopy(SEM) and atomic force microscopy(AFM). Finally, the separation performance of the reverse osmosis membranes was tested in brackish water and seawater condition, respectively. The experimental results show that the separation layers of the reverse osmosis membrane become denser after modifying with PEI and/or ABA, and correspondingly the mass transfer resistance of boron permeation through reverse osmosis membranes is increased. The boron retention rate of the TFC-PEI-ABA membrane modified by both PEI and ABA reach 90.45%, which meets the requirements of World Health Organization(WHO) for water quality.

Key words: Reverse osmosis membrane, Polyethyleneimine, 4-Azidobenzoic acid, Removal of boron from seawater

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