Significantly enhanced antifouling and separation capabilities of PVDF membrane by synergy of semi-interpenetrating polymer and TiO2 gel nanoparticles
Significantly enhanced antifouling and separation capabilities of PVDF membrane by synergy of semi-interpenetrating polymer and TiO2 gel nanoparticles
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半互穿聚合物与TiO2凝胶纳米颗粒协同作用显着增强PVDF膜的防污和分离能力
DOI：
10.1016/j.jiec.2021.11.038
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发表时间：
2021-11
影响因子：
6.1
通讯作者：
Wangqing Zhang
中科院分区：
文献类型：
--
作者：
Yongdi Ma;Xi Chen;Shuai Wang;Hualin Dong;Xiaoying Zhai;Xin Shi;Jianzu Wang;Rujiang Ma;Wangqing Zhang
PVDF膜的疏水性强，抗污染性能低，极大地限制了其实际应用。通过设计并制备以PVDF/聚丙烯酸（PAA）半互穿聚合物（semi-IPN）为膜基质，二氧化钛纳米颗粒为功能组分，F127为成孔剂的膜，成功地克服了这些缺点。在PVDF存在下，将丙烯酸与N，N甲基丙烯酰胺共聚制备半ipn，并在成膜过程中原位形成tio2凝胶纳米颗粒。半ipn、F127和TiO2对复合膜的性能有显著影响。利用半ipn、F127和tio2纳米颗粒调节膜结构，制备出水接触角为40°、BSA截留率为87.5%、水通量为802.5 L/m2/h/bar的复合膜。经过简单的紫外照射后，该复合膜的水通量上升到1030 L/m2/h/bar，截留率没有下降。腐植酸污染后的膜经单次紫外线照射后，水通量可恢复到原来的95.3%以上，具有很好的防污性能。此外，复合膜对牛血清白蛋白和油水乳液也具有很强的抗污染性能和分离性能。综上所述，基于半ipn和均匀分散的tio2纳米颗粒的协同作用，制备的复合膜具有优异的综合性能，在各种分离领域具有很大的应用潜力。
PVDF membrane has strong hydrophobicity and low anti-pollution performance, greatly limiting its practical application. These drawbacks have been successfully overcome by designing and then preparing a membrane with a semi-interpenetrating polymer (semi-IPN) of PVDF/poly(acrylic acid) (PAA) as the membrane matrix, TiO2nanoparticles as functional components and F127 as pore-forming agent. The semi-IPN was prepared by copolymerizing acrylic acid with N,N methyl acrylamide in the presence of PVDF, and the TiO2gel nanoparticles were in situ formed in the membrane-forming process. The properties of the composite membrane were significantly affected by the semi-IPN, F127 and TiO2. By adjusting the membrane structure with the semi-IPN, F127 and TiO2nanoparticles, we prepared a composite membrane with a water contact angle of 40°, a BSA rejection ratio of 87.5% and a water flux of 802.5 L/m2/h/bar. After a simple UV irradiation, the water flux of this composite membrane rose to 1030 L/m2/h/bar, without any rejection decline. The membrane contaminated by humic acid could recover the water flux up to above 95.3% of its original value by a single UV irradiation, showing a very good antifouling performance. In addition, the composite membrane also exhibited a very strong pollution resistance and separation performance for bovine serum albumin and oil-water emulsion. All in all, based on the synergy of the semi-IPN and the evenly dispersed TiO2nanoparticles, the prepared composite membrane exhibited excellent comprehensive properties and demonstrated a great potential for various separation applications.
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