Fabrication of Polyether Sulfone Blend Imprinted Membranes for Selective Adsorption of p-hydroxybenzonic from Salicylic Acid

Highly selective polyether sulfone (PES) blend imprinted membranes for template p -hydroxybenzonic ( p -HB) were synthesized by phase inversion imprinting technique using polybenzimidazoles (PBI) as a functional polymer and nanosized Al 2 O 3 as the additives. The SEM analysis showed that cross-sectional morphology of membranes were strongly influenced by the content of nano-sized Al 2 O 3 . Compared with PES 1 -MIM, PES 2 -MIM and PES 4 -MIM, the PES 3 -MIM containing 2.0 wt.% nano-sized Al 2 O 3 exhibited higher membrane flux, kinetic equilibrium adsorption value, binding capacity and better selectivity for p -HB. The experimental data of adsorption kinetic were well fitted to the pseudo-secondorder kinetic model using multiple regression analysis. Static adsorption isotherm experiments exhibited that the PES 3 -MIM had the maximum adsorption capacity for p -HB. Moreover, selective experiment showed that the selectivity coefficients of PES 3 -MIM for p -HB relative to salicylic acid (SA) was 3.670, showing that PES 3 -MIM had excellent binding affinity and selectivity for separating p -HB form p -HB-contained aqueous solution.