Hyperbranched polyethyleneimine (HPEI) was grafted on the surface of polyvinylidene fluoride (PVDF) microfiltration membrane, and a high-density hydroxyl structure was formed on the surface of PVDF membrane by the ring-opening reaction of glycidol and the terminal amino groups. Contact angle tests confirmed the improved hydrophilicity of the modified membrane. After modification, the contact angle of PVDF membrane was decreased to 42° with initial 85° and the wetting time was shortened to 10s with initial 20s. Static adsorption tests demonstrated that the modified membrane had much less amount of proteins and polysaccharides on the membrane surface compared to the control. Dynamic fouling experiments showed that the modified membrane had significantly higher water flux recovery ratio and lower relative fouled flux ratio in comparison with the pristine PVDF membrane. AFM (Atomic Forces atomic force microscopy) contact force measurements exhibited weaker foulant-membrane interactions and foulant-foulant interactions for the modified membrane, which can be attributed to the abundant hydrophilic groups on the membrane surface and steric effect of the hyperbranched structure.
陈颖青, 文越, 吴志超, 王志伟. 基于HBPs接枝的PVDF膜亲水改性及抗污染性能[J]. 中国环境科学, 2019, 39(9): 3736-3743.
CHEN Ying-qing, WEN Yue, WU Zhi-chao, WANG Zhi-wei. Hydrophilic modification of PVDF membrane based on HPBs and its antifouling properties. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3736-3743.
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