Abstract
The goal of the present work is the development of nanofiltration membranes by the phase inversion technique using a newly developed polymer, cardo poly(arylene ether sulfone) with pendant tertiary amine groups (PES-TA). The obtained membranes were characterised in terms of their water flux, salt and basic dye rejections, the cross-sectional and surface morphologies, surface charge characteristic, and chlorine tolerance. A typical membrane (M-40) exhibited moderate rejection to salts (36.6% to NaCl, 63.3% to MgCl 2 and 70.2% to FeCl 3), but high rejection to basic dyes (>98%). Zeta potential measurements indicated that the PES-TA membranes were positively charged below pH 10.7. The M-40 membrane showed excellent chlorine tolerance. After exposure to an aqueous NaOCl solution (active chlorine concentration ≥1000 ppm) for 20 days, the rejection of membrane was not changed. In addition, the obtained membrane showed efficient separation of basic dyes in the presence of NaCl salt.
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