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Hydrophilic PVDF membrane with versatile surface functions fabricated via cellulose molecular coating
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2021-09-06 , DOI: 10.1016/j.memsci.2021.119817
Yong Wang 1 , Qiangzi Li 2, 3 , Weijun Miao 1 , Peng Lu 1 , Chun You 2, 3 , Zongbao Wang 1
Affiliation  

Hydrophilic PVDF membrane was fabricated in single step via cellulose molecular coating prepared by homogeneous solution of cellulose oligomer synthesized by enzyme catalysis (EC)/Trifluoroacetic acid (TFA). Both smooth and rough coatings can be prepared by regulating the aggregative structure of cellulose molecular coatings. The chemical structures of the cellulose and its coating were confirmed by 1H Nuclear Magnetic Resonance Spectroscopy (1H NMR) and Fourier Transform Infrared Spectroscopy (FTIR). The aggregation structure of the cellulose coating was characterized by wide-angle X-ray diffraction (WAXD). X-ray Photoelectron Spectroscopy (XPS) studies unveiled the strong binding of cellulose molecular to PVDF membranes at the interface. Scanning Electron Microscopy (SEM) morphologies show that the cellulose molecules were uniformly coated on the surface and cross section of the membranes. Water contact angle measurement suggested that cellulose molecular coating possessed high hydrophilicity and wetting rate, giving the PVDF membranes high water flux and excellent anti-fouling performances. The coated membranes also show excellent adsorption and desorption performances for crystal violet (CV). The superior performances of incompletely crystallized cellulose coating over amorphous cellulose coating were attributed to the increased specific surface area resulting from the surface roughness. The construction of cellulose molecular coating with controlled aggregation structure provides a novel efficient technology in the field of purification of wastewater, opening up a new approach to the microstructural manipulation of the hydrophilic coating.



中文翻译:

通过纤维素分子涂层制造的具有多功能表面功能的亲水性 PVDF 膜

亲水性 PVDF 膜是通过纤维素分子涂层一步制备的,纤维素分子涂层由酶催化 (EC)/三氟乙酸 (TFA) 合成的纤维素低聚物的均匀溶液制备。通过调节纤维素分子涂层的聚集结构,可以制备光滑和粗糙的涂层。纤维素及其涂层的化学结构由1 H 核磁共振光谱证实(1H NMR)和傅立叶变换红外光谱(FTIR)。纤维素涂层的聚集结构通过广角 X 射线衍射 (WAXD) 表征。X 射线光电子能谱 (XPS) 研究揭示了纤维素分子在界面处与 PVDF 膜的强结合。扫描电子显微镜 (SEM) 形态表明纤维素分子均匀地涂覆在膜的表面和横截面上。水接触角测量表明,纤维素分子涂层具有较高的亲水性和润湿率,使PVDF膜具有较高的水通量和优异的防污性能。涂覆的膜还对结晶紫(CV)显示出优异的吸附和解吸性能。不完全结晶的纤维素涂层优于无定形纤维素涂层的优异性能归因于由表面粗糙度引起的比表面积增加。具有可控聚集结构的纤维素分子涂层的构建为废水净化领域提供了一种新的高效技术,为亲水涂层的微观结构操作开辟了新途径。

更新日期:2021-09-16
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