• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Surface modification of thin film composite polyamide membranes by electrostatic self deposition of polycations for improved fouling resistance
【24h】

Surface modification of thin film composite polyamide membranes by electrostatic self deposition of polycations for improved fouling resistance

机译：通过聚阳离子的静电自沉积法对薄膜复合聚酰胺膜进行表面改性，以提高抗污性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Interfacially polymerized polyamide thin film composite membrane was modified by electrostatic self-assembly of polyethyleneimine on the membrane surface, and the modified membrane showed significantly improved antifouling properties. The charge reversal on the membrane surface due to the application of the polyethyleneimine layer was shown to increase the fouling resistance of the membrane to cationic foulants because of the enhanced electrostatic repulsion, and the increased surface hydrophilicity would help minimize the flux reduction. The effects of parameters involved in the membrane surface modification (e.g., polyethyleneimine concentration and deposition time) on the membrane performance were investigated in terms of water permeation flux and salt rejection. The membrane modification was found to increase salt rejections when MgCl2 and NaCl were tested. The fouling behavior of the membranes was also studied with and without the presence of dodecyltrirnethylammonium bromide (which is a common cationic surfactant present in waste water). It was shown that while the deposited polyethyleneimine surface layer tended to offer additional resistance to permeation, the improved fouling resistance and the increased surface hydrophilicity compensated for the reduction in membrane permeability due to the deposition of the polyethyleneimine layer.
机译：通过聚乙烯亚胺在膜表面上的静电自组装对界面聚合的聚酰胺薄膜复合膜进行了改性，该改性膜表现出显着改善的防污性能。由于施加了聚乙烯亚胺层，膜表面上的电荷逆转显示出由于增强的静电排斥而增加了膜对阳离子污垢的抗污性，并且增加的表面亲水性将有助于最小化通量降低。根据透水通量和脱盐率，研究了涉及膜表面改性的参数（例如聚乙烯亚胺浓度和沉积时间）对膜性能的影响。当测试MgCl2和NaCl时，发现膜的改性增加了盐的截留率。在有或没有十二烷基三甲基溴化铵（废水中常见的阳离子表面活性剂）存在下，也研究了膜的结垢行为。结果表明，尽管沉积的聚乙烯亚胺表面层倾向于提供附加的抗渗透性，但是由于聚乙烯亚胺层的沉积，改善的耐污性和增加的表面亲水性补偿了膜渗透性的降低。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号