Effect of coagulation bath and amphiphobic modification on the structure and membrane distillation properties of polyvinylidene fluoride membrane
Membrane distillation(MD)technology has a wide prospect in the field of high salt wastewater treatment.How to obtain high performance MD membranes is the focus of research.In this paper,PVDF pristine membranes were prepared by nonsolvent-thermally induced phase separation(NTIPS).The effects of different coagulation baths(namely,ethanol,glycerol and their mixtures)on the structure and MD properties of PVDF pristine membranes were investigated.The water flux and salt rejection of MD,anti-wetting,and anti-fouling properties of the amphiphobic membrane modified by 1H,1H,2H,2H-perfluorodecyltriethoxysilane were further investigated.The results show that the structure of the pristine membrane can be changed from finger-like to spongy-like pores structure by tuning the coagulation conditions.The PVDF amphiphobic membrane has excellent anti-wetting and anti-fouling properties when treated with simulated feed containing salt,surfactant,oil or humic acid.This study provides a feasible route not only for controlling the pore structure of PVDF membrane via the NTIPS process,but also a viable method for amphiphobic modification method of PVDF membrane.
PVDF amphiphobic membranecoagulation bathnonsolvent-thermally induced phase separation(NTIPS)membrane distillationstructure control
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