کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
634728 | 1456073 | 2013 | 7 صفحه PDF | دانلود رایگان |
Cation exchange multisilicon copolymer with a long main chain and many branched chains as well as high content of cation exchange and Si(OR)3 groups has been developed from sodium allylsulfonate (SAS) and vinyltrimethoxysilane (VTMS). The corresponding PVA/SiO2 cation exchange hybrid membranes have been prepared via the sol–gel process of the copolymer with poly(vinyl alcohol) (PVA).The hybrid membranes have the water uptake (WR) 84–106%, ion exchange capacity (IEC) 0.14–0.45 mmol/g, initial decomposition temperature (IDT) 225–233 °C and tensile strength (TS) 23.9–44.0 MPa. They are stable in 1 M NaOH solution with a linear expansion ratio (LER) of 17.7–18.3% and a weight loss percent of 4.3–5.5% for 30 days. The diffusion dialysis (DD) process for the alkali mixture indicates that the dialysis coefficients of NaOH (UOH) are around 0.0065–0.0086 m/h and the separation factors (S) are in the range of 24.4–51.6 for the NaOH/Na2WO4 system and 13.9–9.6 for the NaOH/NaAlO2 system. Hence, the hybrid membranes can be potentially applied in the DD process for the alkali recovery.
► Membranes were prepared from copolymers (poly(SAS-co-VTMS)) and PVA.
► Membranes possess favorable flexibility and alkali resistance.
► Membranes are qualified for alkali recovery from the spent liquor.
Journal: Journal of Membrane Science - Volumes 425–426, 1 January 2013, Pages 156–162