Modification of poly(vinylidene fluoride)/polyethersulfone blend membrane with polyvinyl alcohol for improving antifouling ability
Modification of poly(vinylidene fluoride)/polyethersulfone blend membrane with polyvinyl alcohol for improving antifouling ability
复制标题
聚乙烯醇对聚偏二氟乙烯/聚醚砜共混膜的改性提高防污能力
DOI：
10.1016/j.memsci.2014.05.006
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发表时间：
2014-09-15
影响因子：
9.5
通讯作者：
Wu, Zhichao
中科院分区：
文献类型：
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作者：
Zhang, Jie;Wang, Qiaoying;Wu, Zhichao
通过添加聚乙烯醇（PVA）对聚偏氟乙烯（PVDF）/聚醚砜（PES）共混膜进行改性，以提高共混膜的相容性。从孔隙率、接触角、纯水通量、临界通量和污染速率等方面对膜的理化特性进行了系统的分析。采用扩展的Derjaguin-Landau-Verwey-Overbeek（XDLVO）理论对改性膜的可降解性进行了评价，并在中试规模的浸没式缺氧/好氧膜生物反应器中对膜的长期性能进行了评价。结果表明，在PVDF/PES共混膜中加入0.3%的PVA可有效地改善膜的亲水性和渗透性。在间歇过滤实验中也观察到改性膜的临界通量的增加和污染速率的降低。XDLVO分析表明，PVA的加入显着提高了膜的内聚自由能。可溶性微生物产物与膜表面之间的能垒增加，从而减少了膜污染物的吸附。长期的过滤过程也表明，0.3%的PVA改性的PVDF/PES膜的可渗透性显着提高。该研究为通过添加PVA助剂来提高PVDF/PES复合膜的渗透性能提供了一条有效途径。(C)2014爱思唯尔有限公司版权所有。
The modification of poly(vinylidene fluoride)/polyethersulfone (PVDF/PES) blend membranes was carried out by adding polyvinyl alcohol (PVA) to improve their antifouling ability. The physicochemical characteristics of the membranes in terms of porosity, contact angle, pure water flux, critical flux and fouling rate were systematically analyzed. The extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory was used to assess the antifouling ability of the modified membranes, and the membrane's long-term performance was also evaluated in a pilot-scale submerged anoxic/oxic membrane bioreactor for wastewater treatment. The results showed that the hydrophilicity and permeability of PVDF/PES blend membrane were efficiently improved by adding 0.3% PVA. The increase of critical flux and the decrease of fouling rate for the modified membrane were also observed in batch filtration experiments. XDLVO analysis indicated that the addition of PVA significantly improved the cohesion free energy of the membranes. The energy barrier between soluble microbial products and membrane surfaces was increased, which therefore reduced the adsorption of membrane foulants. The long-term filtration process also demonstrated that the antifouling ability of PVDF/PES membrane modified by 0.3% PVA was significantly enhanced. The study offers an effective way to enhance membrane antifouling ability of PVDF/PES membrane through the addition of PVA additives. (C) 2014 Elsevier B.V. All rights reserved.