Abstract
In this research, we fabricate pairs of oppositely charged graphene oxide (GO) membranes (negatively charged n-GO and positively charged p-GO) with efficient cation or anion selectivity. The fabricated primary GO membrane carries a negative charge (n-GO). The positively charged p-GO membrane was prepared by ultrasonic stirring with polyethyleneimine. The electrical properties of the n-GO and p-GO films were examined based on a fluorescence electron microscope and zeta potentials in NaCl solution at different concentrations and times. The results show that the zeta potential of n-GO and p-GO both stabilize and maintain their charge properties in NaCl solution. The good ion selectivity of n-GO and p-GO was determined by X-ray spectroscopy (EDX) mapping.
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