Nanofibrous Membrane of Sulfonated Poly(ethylene terephthalate) for Removal of Metal Ions
Seyed Abdolkarim Hosseini Ravandi,
In this investigation anelectrospunsulfonated poly(ethylene terephthalate) (SPET) nanofibrous mat was prepared by electrospinning
of the SPET solution in trifluoroaceticacid (TFA)/dichloromethane (DCM) mixture. The produced nanofibers had average diameter
of 133nm. The performance of the aforementioned membrane for removal ofFe3+, Mg2+ and Ca2+under different conditions of applied
pH and pressure wasstudied. The cross flow recirculation ultrafiltration set-up was employed.Under optimum conditions (pH 1.5
and pressure of 1.2 bar) the removal of Fe3+, Mg2+ and Ca2+were 87.1, 77.14 and 34.92, respectively. The filtration mechanism was also
determined through blocking laws and permeate volume data. Subsequently, an acceptable agreement (98%) was achieved for internal
pore blocking mechanism. Two equilibrium adsorption isotherms: Langmuir and Freundlich were fitted to the salts’ equilibrium sorption
data on SPET membrane at different feed concentrations. The Freundlich isotherm was found to well represent the measured adsorption
data based on the higher coefficientof determination (r2).
Keywords: Nanofibrous membrane, metal ion filtration, adsorption isotherms, filtration mechanism.
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