Preparation and Modification of PVDF Membrane and Study on Its Anti-Fouling and Anti-Wetting Properties

Membrane distillation (MD) has unique advantages in the treatment of high-salt wastewater because it can make full use low-grade heat sources. The high salinity mine water western mining areas China is rich Ca2+, Mg2+, SO42? and HCO3?. In MD process, inorganic substances feed will cause membrane fouling. At same time, low surface tension organic which could be introduced process irreversible wetting. To improve anti-fouling anti-wetting properties membrane, PVDF omniphobic this paper was prepared by electrospinning. contact angle (WCA) reach 153°. Direct (DCMD) then used for treating high-salinity water. results show that, compared with unmodified membranes, flux reduction rate reduced 34% 20 h, showing good property. More importantly, cannot wetted easily containing 0.3 mmol/L SDS. extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory to analyze free energy interface interaction between pollutants, aiming that more difficult pollute. result consistent variation DCMD providing an effective basis explaining mechanism fouling