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Fabrication of fluorinated PDMS/PVDF amphiphobic membrane and its application in membrane distillation

Authors： ZHANG Xueli1,2,3,4, LI Baoan,2,4,5

Units： 1. School of Chemical Engineering and Technology，Tianjin University，Tianjin 300350，China；2. Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)，Tianjin 300072，China；3. State Key Laboratory of Chemical Engineering(Tianjin University)，Tianjin 300072，China；4. Tianjin Key Laboratory of Membrane Science and Desalination Technology，Tianjin 300350，China；5. College of Enviromental Science and Engineering，Nankai University，Tianjin 300350，China

KeyWords： polydimethylsiloxane; fluorosilane; amphiphobic; membrane distillation; anti-fouling

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(1):102-111

Abstract：

Membrane distillation (MD), as a new desalting technology, can utilize low grade energy. However, large-scale application based on membrane distillation has not been widely used. One of the important reasons is the lack of membrane with good anti-fouling property. Therefore, it is of critical importance to prepare amphiphobic membrane to improve the anti-fouling property. A functional layer was formed on the PVDF membrane surface by using polydimethylsiloxane (PDMS), tetraethoxysilane (TEOS) and dibutyltin dilaurate (DBTDL). Next, the surface was fluorinated with 1H,1H,2H,2H-perfluorodecyltriethoxysilane to obtain amphiphobic membrane. The contact angles of water and oil reached 161.3° and 134.9° respectively, showing obvious superhydrophobic and oleophobic properties. In addition, the amphiphobic membrane still shares good stability under harsh conditions. The long-term direct contact membrane distillation (DCMD) experiment shows outstanding comprehensive anti-fouling capacity with higher flux and excellent salt rejection.

Funds：

国家自然科学基金项目( 21878218 )

AuthorIntro：

张学励( 1992- )，男，浙江宁波人，硕士研究生，膜蒸馏材料表面改性

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