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Preparation of Structurally Integrated Janus Membranes Applied to Oil-Water Emulsion Separation

Authors： DENG Chengyu, LI Tiantian, HOU Xueyi, LU Yanyue , LIU Fu

Units： School of Chemistry and Chemical Engineering of Guangxi Minzu for Nationalities, Guangxi Key Laboratory of Polysaccharide Materials and Modification, Guangxi, Nanning 530006;Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Zhejiang, Ningbo 315201;Hebei University of Science and Technology, School of Materials Science and Engineering, Hebei, Shijiazhuang 050018

KeyWords： polyvinylidene fluoride; hydrophilic modification; membranes; emulsions; separation

ClassificationCode：TQ316.6 改性处理，TQ317 高分子化合物产品，TQ319 三

year,volume(issue):pagination： 2022,42(6):57-69

Abstract：

Hydrophilic polymer copolymers (PVP-VTES) were hydrolyzed, unidirectional migration and thermal crosslinking in the polyvinylidene fluoride (PVDF) matrix to make the membrane surface show effective hydrophilicity, and Janus membrane with controllable thickness of hydrophilic layer and "structural integration" of hydrophilic/hydrophobic layer were successfully prepared. The morphology, structure, chemical composition, wettability and other performance parameters of Janus membrane was characterized. The results showed that the water contact Angle (WCA) value of the hydrophobic surface of Janus membrane remained at 110 °, the underwater oil contact Angle (OCA) value of the five oil droplets decreased to 0 ° rapidly, and the underwater OCA value of the hydrophilic surface of Janus membrane was as high as 155 °. Janus membrane was used for switchable separation of oil-in-water (O/W) or water-in-oil (W/O) emulsion: the water flux of O/W emulsion for soybean oil was 22.88 L/m2 ·h, and the separation efficiency was 93.35 %; the oil flux for W/O emulsion was 17.45 L/m2 ·h, and the separation efficiency was 91.47 %. The water flux of O/W emulsion for chloroform was 358.81 L/m2 ·h, and the separation efficiency was 95.54 %. The oil flux of W/O emulsion for toluene was 269.21 L/m2 ·h, and the separation efficiency was 91.87 %. Compared with the low flux and low separation efficiency of pure hydrophobic membrane and pure hydrophilic membrane, Janus membrane has better separation effect on oil-water emulsion.

Funds：

国家自然科学基金地区基金(21968008, 21566007)；广西自然科学基金(2018GXNSFAA050025)

AuthorIntro：

邓成雨(1995-)，女，重庆，硕士研究生，研究方向为高分子材料膜制备及膜分离方向

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