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Preparation of partially carbonized PTFE/PVDF hollow fiber membrane and its oil-water separation performance

Authors： ZHANG Ziying, XIAO Fen, SHENG Mingxin, DONG Yongquan

Units： 1 National and Local Joint Engineering Research Center for Heavy Metal Pollutant Control and Resource Utilization ，Nanchang 330063, , China；2 School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, , China

KeyWords： Oil-water separation; Phase conversion-carbonization; PTFE; Hollow fiber membrane

ClassificationCode：TQ028.4

year,volume(issue):pagination： 2024,44(1):45-55

Abstract：

The hydrophobic fluorocarbon material, polytetrafluoroethylene (PTFE), poses challenges in film formation through phase conversion. In this work, a PTFE suspension was obtained by dispersing PTFE powder in a polyvinylidene fluoride (PVDF) solution. Firstly, the PTFE/PVDF hollow fiber membrane embryo was prepared using a dry and wet phase conversion method. Subsequently, partial carbonization of the PTFE/PVDF hollow fiber membrane was achieved under a nitrogen atmosphere. The carbonization process of the membrane embryo, surface element and microstructure changes before and after membrane carbonization was studied using thermogravimetric analysis, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Finally, the changes in hydrophilicity and oil-water separation performance were evaluated for the membrane. The results revealed that PVDF within the PTFE/PVDF hollow fiber membrane embryo underwent C-H fracture at 360-450℃ while partially carbonizing the membrane structure. This led to a reduction in pore size and formation of a continuous and complete microporous structure within the partially carbonized hollow fiber membranes. With 40% PTFE content, after carbonization, the contact angle of the film reached 102° indicating increased hydrophobicity. Moreover, when tested with simulated oil-bearing wastewater containing 10% oil content, these membranes exhibited an impressive permeation flux of 30 L?m-2?h-1 (Transmembrane differential pressure 0.1MPa) along with an efficient separation efficiency reaching up to 80%. These results highlight their promising potential for commercial applications in effective oil-water separation.

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AuthorIntro：

张紫莹（2000-），女，学生，江西萍乡人，硕士研究生，研究方向为膜法水处理方向，E-mail：1846384674@qq.com

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