内嵌碳纳米管层的导电正渗透膜制备及其缓解有机污染的研究
作者:徐梦思, 马广翔,易夏文,马涛,王新华
单位: 1.江南大学环境与土木工程学院,无锡 214122; 2.山东省环境保护科学研究设计院有限公司,济南 250100; 3.江苏省生物质能与减碳技术工程实验室,无锡 214122; 4.江苏省水处理技术与材料协同创新中心,苏州 215009
关键词: 正渗透膜;碳纳米管;导电膜;外加电场;有机污染
分类号: TQ028.8
出版年,卷(期):页码: 2021,41(3):9-15

摘要:
 针对正渗透(FO)膜的有机污染问题,本文在多孔聚醚砜(PES)载体和聚酰胺(PA)活性层之间嵌入碳纳米管(CNTs)中间层制备导电FO膜的基础上,考察外加电场条件下导电FO膜缓解有机污染的可行性。结果表明,在嵌入CNTs中间层后,相比于常规FO膜,导电FO膜的表面粗糙度由33.85±4.05 nm增加到46.85±6.55 nm,表面电阻由2.1×1012 Ω 大幅降低到 54.7 Ω;导电FO膜的清水通量提升了2.33倍,盐通量与水通量的比值(Js/ Jw)降低4.72倍左右,运行性能显著提升。在未施加电场条件下的有机污染实验表明,导电FO膜的通量衰减率仅比常规FO膜下降了1.9%,而膜面污染物数量没有变化。然而,当施加2 V电场后,导电TFC-FO膜的通量衰减率比常规FO膜下降了10.1%,且膜面污染物的量减少了94.6%。CNTs中间层的引入有效提升了FO膜性能,并且在外加电场的条件下,可以有效缓解有机污染。
  In order to mitigate organic fouling of forward osmosis (FO) membrane, a conductive composite forward osmosis (TFC-FO) membrane was firstly prepared in this paper via embedding an intermediate layer of carbon nanotubes (CNTs) between the porous polyethersulfone (PES) carrier and the polyamide (PA) active layer, and then its feasibility of alleviating organic fouling under the applied electric field was investigated. The results indicated that after adding the CNTs intermediate layer, compared with the conventional TFC-FO membrane, the surface roughness of the conductive TFC-FO membrane increased (46.85±6.55 nm VS 33.85±4.05 nm), and its surface resistance was greatly reduced (2.1×1012 Ω VS 54.7 Ω). In addition, the water flux of the conductive TFC-FO membrane was increased by 2.33 times, and its Js/ Jw value was reduced by about 4.72 times. During the fouling experiment without the electric field, although the flux decline of the conductive TFC-FO membrane decreased 1.9% compared with the conventional TFC-FO membrane, there was no difference in the quantity of the organic foulants. However, when applying a 2 V electric field, the flux drop rate of the conductive TFC-FO membrane reduced 10.1% and the foulants decreased 94.6%. The introduction of the CNTs intermediate layer effectively improves the performance of the FO membrane and alleviates the organic fouling with the help of the applied electric field.

基金项目:
山东省重大科技创新工程项目(2018CXGC1006);江苏省“六大人才高峰”高层次人才项目(JNHB-014)

作者简介:
徐梦思(1996-),女,河南驻马店人,硕士生,主要从事膜法水处理技术研究

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