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Preparation of hydrophobic/lipophilic alkyl SiO2/PTFE membrane
and research on oil-water separation process

Authors： PENG Qianqian1,2, GUO Chungang1, CHANG Na2,CHEN Jiangrong1, SHAO Wei2, SUN Wei1， WANG Haitao3, LIU Guochang1

Units： 1. The Institute of Seawater Desalination and Multipurpose Utilization, MNR(Tianjin), Tianjin 300192, China; 2. College of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China; 3. School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China

KeyWords： alkyl silica; PTFE membrane; hydrophobic and lipophilic; oil-water separation

ClassificationCode：TQ316.6

year,volume(issue):pagination： 2025,45(4):104-112

Abstract：

To achieve highly efficient separation of oil-water mixtures or oil-water emulsions with the principle of permitting oil passage while blocking water, it is necessary to prepare a superhydrophobic/lipophilic separation membrane. A hydrophobic/lipophilic SiO2/PTFE (SP) membrane was fabricated by depositing a self-synthesized alkyl SiO2 impregnating solution onto a polytetrafluoroethylene (PTFE) substrate via vacuum filtration. The surface characteristics and oil-water separation performance of the SP membrane were systematically investigated. Results revealed that the alkyl SiO2-modified PTFE membrane exhibited a micro-nano hierarchical rough structure, which significantly enhanced its hydrophobicity and lipophilicity. At an alkyl SiO2 deposition amount of 1 956 mg/m2, the membrane achieved a water contact angle of 154°, with oil droplets fully permeating within 1 second. The SP membrane demonstrated enhanced separation efficiency and permeation flux when processing n-hexadecane/water mixtures as the oil concentration increased. At an oil-water ratio of 3∶1(quality ratio), the separation efficiency for n-hexadecane reached 98.31%, with a permeation flux (-0.09 MPa) of 992 L/(m2·h). For various mixtures, including n-hexane/water, n-decane/water, n-hexadecane/water, and Isopar G/water, the separation efficiencies of SP membrane exceeded 98%. The corresponding permeation fluxes (-0.09 MPa) are 2 574, 1 781, 992, and 3 007 L/(m2·h), respectively. Additionally, when handling n-hexane and n-hexadecane oil-in-water emulsions, the separation efficiencies of SP membrane maintained above 97%, with permeation fluxes (-0.09 MPa) of 512 and 230 L/(m2·h), respectively. The water content in the oil phase obtained through oil-water or emulsion separation using the SP membrane was below 0.01%. After undergoing 10 usage cycles, the SP membrane retained a separation efficiency greater than 96% for n-hexadecane/water mixtures, with a permeation flux attenuation rate of less than 7%, showcasing outstanding oil-water separation capabilities.

Funds：

中央级公益性科研院所基金（K-JBYWF-2024-QR-04，K-JBYWF-2024-ZT02，K-JBYWF-2022-T01）

AuthorIntro：

彭倩倩（2000-），女，四川资阳人，硕士研究生，研究方向为多孔膜制备与改性技术

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