A series of pH-sensitive poly (acrylic acid)-graft-polypropylene hollow fiber microfiltration membranes were prepared
by UV-photo-irradiation. Bovine serum albumin (BSA) was chosen as the model protein to investigate its absorption and
fouling behaviors on membranes. The results showed that the hydrophilicity of grafted membrane was improved by
poly(acrylic acid) chains with parts of membrane pores blocked. The grafted membranes were markedly pH-dependent
on the water permeability as pH was altered from 1 to 11. The zeta potential of grafted membranes calculated by
streaming potential was negative in most pH range. Electrostatic interaction energy calculated by DLVO theory showed
the electric interaction force between grafted membrane and BSA was attractive. With the rise of grafting degree, the
electric attractive force between grafted membrane and BSA increased as pH=3 and decreased as pH=8, while it kept
basically unchanged as pH=4.7. As a result, most serious fouling was observed as pH=4.7. Grafted membranes had a
lower BSA absorption and better antifouling behavior as pH=8, while the opposite result was revealed as pH=3. In
conclusion, the absorption and fouling behavior of BSA on membranes was pH-dependent due to the pH-dependence of
membrane charge, and the conformation of BSA and grafting chains.
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