Performance degradation of PVDF membrane in alkali solution
LIU Hong-jing
JIAO Yang
LI Dong
YAO Hui
LI Bo
Abstract：In order to research the performance change of polyvinylidene fluoride (PVDF) membrane in alkali solution, the contact angle, critical water inlet pressure for the membrane, gas permeation flux, pore size, and porosity of PVDF membrane were analyzed with the unilateral immersion method.The results show that after immersing in the alkali solution with the concentration of 1.5mol/L for 300h, the surface hydrophobic performance of PVDF membrane declines, the membrane pores are wetted, and the mass transfer resistance increases.In addition, the hydrophobic performance of PVDF membrane decreases with increasing the concentration of alkali solution.When the immersion time of PVDF membrane is between 150h and 250h, the gas permeation flux and pore size exhibit the maximum variation amplitude.After immersing for 300h, the porosity of PVDF membrane increases, the mass transfer coefficient decreases, and the mass transfer resistance increases.With increasing the concentration of alkali solution, the change in the structure and performance of PVDF membrane is more obvious.
Keywords：polyvinylidene fluoride (PVDF)microporous membranealkali solutionmembrane performancemembrane wettingmass transfer coefficientmass transfer resistancemembrane degradation
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 147-152 )