高通量rGO微球@PVDF纳米纤维复合膜的制备及其油水分离性能研究

摘要采用静电纺丝法制备了聚偏氟乙烯(PVDF)纳米纤维膜,并采用共混纺丝法和真空抽滤两种方式将还原氧化石墨烯微球(rGO)负载于其上,获得高通量rGO微球@PVDF纳米纤维复合油水分离膜。通过调整静电纺丝过程参数(如推注速率和电场强度等)和纺丝液配方,对PVDF纳米纤维膜结构进行优化,并采用不同的rGO微球负载量、负载方式、黏结剂含量来提高纳米纤维膜的表面粗糙度和疏水性。利用扫描电子显微镜和接触角测试对纤维膜的表面形貌和亲疏水性进行表征,并通过二氯甲烷-水体系进行油水分离实验,测试了不同配方下杂化膜的重力驱动油水分离性能。结果表明,当静电纺丝溶液中PVDF含量为14%时,以1 mL·h^-1的推注速率,在15 kV下制得的PVDF纳米纤维膜,并将1%PVDF溶液、3 mg rGO微球(与黏结剂中有效成分PVDF质量比为3∶1)和溶剂组成的铸膜液抽滤在膜表面,复合膜表面水接触角为130.9°,其油水分离过程中的有机溶剂透过通量可达5 641.3 L·h^-1·m^-2,水相的截留率为99.28%。

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	来晨雨
	王瑞
	程丝楠
	范红玮
	孟洪

关键词：静电纺丝聚偏氟乙烯还原氧化石墨烯微球油水分离膜

Abstract： In this work, polyvinylidene fluoride (PVDF) nanofiber membranes were prepared by electrostatic spinning, and reduced graphene oxide microspheres (rGO) were loaded onto them by both the co-blending spinning method and vacuum filtration to obtain a high-throughput rGO microspheres@PVDF nanofiber composite oil-water separation membrane. The structure of the PVDF nanofiber membrane was optimized by adjusting the parameters of the electrostatic spinning process (e.g., push-injection rate, electric field strength, etc.) and spinning solution formulation, and different rGO microsphere loadings, loading modes, and binder contents were used to improve the surface roughness and hydrophobicity of the nanofiber membrane. The surface morphology and hydrophobicity of the fibrous membranes were characterized by scanning electron microscopy and contact angle test, and the gravity-driven oil-water separation performance of the hybrid membranes with different formulations was tested by oil-water separation experiments with dichloromethane-water system. The results showed that the PVDF nanofiber membrane fabricated at a push rate of 1 mL·h^-1 at 15 kV when the PVDF content in the electrostatic spinning solution was 14%, and the casting solution containing 3 mg of rGO microspheres (3:1 mass ratio of rGO microspheres to PVDF, the active ingredient in the binder), 1% of PVDF was immobilized on the membrane surface with the help of a vacuum extraction device, and the water contact angle on the surface of the composite membrane was 130.9°, and the organic solvent transmission flux during its oil-water separation process could reach 5 641.3 L·h^-1·m^-2, and the retention rate of retained water was 99.28%.

Keywords： electrostatic spinning polyvinylidene fluoride reduced graphene oxide microspheres oil-water separation membrane

Received 2023-10-08;

Fund:国家重点研发计划(2021YFB3801301);国家自然科学基金项目(22108010)。

Corresponding Authors: 范红玮,副教授,E-mail:fanhongwei@mail.buct.edu.cn;孟洪,教授,E-mail:menghong@xju.edu.cn。 Email: fanhongwei@mail.buct.edu.cn;menghong@xju.edu.cn

About author: 来晨雨(1998-),女,博士研究生,研究方向为油水分离膜等新型膜材料开发及应用。

引用本文:

来晨雨, 王瑞, 程丝楠, 范红玮, 孟洪.高通量rGO微球@PVDF纳米纤维复合膜的制备及其油水分离性能研究[J]. 化学工业与工程, 2024,41(2): 47-56

LAI Chenyu, WANG Rui, CHENG Sinan, FAN Hongwei, MENG Hong.Preparation of high flux rGO microspheres@PVDF nanofiber composite membranes and their oil-water separation properties[J]. Chemcial Industry and Engineering, 2024,41(2): 47-56

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