Preparation of high flux rGO microspheres@PVDF nanofiber composite membranes and their oil-water separation properties

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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%.

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	Articles by authors
	LAI Chenyu
	WANG Rui
	CHENG Sinan
	FAN Hongwei
	MENG Hong

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

Received 2023-10-08;

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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,V41(2): 47-56

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