Preparation and properties of sulfonated poly (2, 6-dimethyl-1, 4-phenyleneoxide)/mesoporous silica hybrid membranes for alkali recovery

摘要

Cation exchange membranes (CEMs) aimed at alkali recovery were prepared by incorporation of amino modified mesoporous silica (AMMS) particles into sulfonated poly (2, 6-dimethyl-1, 4-phenyleneoxide) (SPPO). The as-prepared membranes possess water uptake (W-R) of 36-42.1%, swelling degree of 49.7 -60.5%, mass loss around 8-16.6%, tensile strength (TS) of 26-30.8 MPa, as well as favorable thermal stability. The samples were investigated in NaOH/Na2WO4 model waste feed solution for alkali recovery via diffusion dialysis (DD) at various temperatures. Results revealed that the hybrid membrane always maintain high values of OH coefficients and separation factors as well even at 55 degrees C. Improved performances of hybrid membranes were most likely due to the acid-base pairs between amino and sulfonic acid group and crosslinking between sulfonic acid groups under thermal treatment. (C) 2016 Elsevier Inc. All rights reserved.