Chen Bin, Zhang Yan, Zhang Jialu, Zhu Lijing, Zhao Haichao
School of Materials Science and Engineering, Shenyang University of Chemical Technology 11 St. Economic & Technological Development Zone Shenyang 110142 P. R. China.
Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science Ningbo 315201 P. R. China
RSC Adv. 2019 Jun 13;9(32):18688-18696. doi: 10.1039/c9ra03337h. eCollection 2019 Jun 10.
Polyvinylidene fluoride (PVDF) porous membranes with enhanced hydrophilicity and antifouling performance were developed surface PEGylation (PEG, polyethylene glycol) a reactive graphene oxide (GO) additive. PVDF/GO blended membranes were first fabricated a non-solvent-induced phase separation process. Then the carboxyl groups of GO sheets immobilized on the membrane surface acted as initiating sites for grafting amine-functionalized PEG (PEG-NH) chains an amination reaction. Analysis of the X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy-attenuated total reflectance results confirmed the successful grafting of hydrophilic PEG molecular chains on PVDF membrane surfaces. The water contact angle of the PEGylated PVDF membrane decreased to 59.9°, indicating improved hydrophilicity. As a result, the antifouling performance was enhanced significantly. After surface PEGylation, the flux recovery rate is reached 90.2%, the total fouling ratio was as low as 20.7%, and reversible fouling plays a dominant role during the membrane fouling process. This work provides a valuable strategy to fabricate PEGylated membranes the introduction of a reactive GO additive.
通过表面聚乙二醇化（PEG，聚乙二醇）和反应性氧化石墨烯（GO）添加剂，制备了具有增强亲水性和抗污染性能的聚偏氟乙烯（PVDF）多孔膜。首先通过非溶剂诱导相分离过程制备PVDF/GO共混膜。然后，固定在膜表面的GO片层的羧基作为胺化反应接枝胺官能化PEG（PEG-NH₂）链的起始位点。X射线光电子能谱和傅里叶变换红外光谱-衰减全反射结果分析证实了亲水性PEG分子链成功接枝到PVDF膜表面上。聚乙二醇化PVDF膜的水接触角降至５９.９°，表明亲水性得到改善。结果，抗污染性能显著增强。表面聚乙二醇化后，通量恢复率达到9０.2％，总污染率低至2０.7％，并且在膜污染过程中可逆污染起主要作用。这项工作通过引入反应性GO添加剂提供了一种制备聚乙二醇化膜的有价值策略。
