This study explored the impact of inorganic salts (NaCl, KCl, LiCl) as an inorganic additive in the preparation of polyvinylidenefluoride (PVDF) membranes using the phase inversion technique. PVDF membrane were prepared by varying the percentage of inorganic salts (NaCl, KCl, LiCl)(0-5wt%) in the dope solution. The dimethyl acetamide(DMAc) was used as the solvent of dope. The inorganic salts were dissolved in deionized water, and then added into the PVDF/DMAc dope solution. The experimental results showed that the contact angle decreased as inorganic salts were added in the castling solution. With the increasing concentration of NaCl, KCl, LiCl from 0-5wt%, the water flux increased from 60L/m2h to 980 L/m2h and the rejection decreased from 90.0% to 55.0%, meanwhile, the static contact angle stabilized basically around 70o. The membrane were characterized through scanning electron microscope(SEM), transmission electron microscope(TEM) and Brunauer-Emmett-Teller(BET), respectively. The results indicate that the inorganic salt are uniformly dispersed in PVDF membranes, the pore structure showed obvious change as the amount of inorganic salt.

Effect of inorganic salt as porogen on the structure and properties of polyvinylidene fluoride(PVDF) membranes

256th National Meeting (2018)

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