Swelling and Dye Adsorption Characteristics of Superabsorbent Polymers
In the current study, SAPs of cationic monomer [2 - (Methacryloyloxy) ethyl] trimethylammonium chloride have been prepared by free radical solution polymerisation with different crosslinkers. They were subjected to repeated cycles of swelling and de-swelling in DI water and NaCl solution. The conductivity of the swelling medium was measured and related to the swelling/de-swelling characteristics of the SAPs. The swelling capacity was also determined in saline solution. The swelling and de-swelling processes were described by first-order kinetics. The SAPs exhibited varied swelling capacity for crosslinkers of the same functionality as well as different functionality. The SAPs were used to adsorb, the dye Orange G at different initial concentrations of the dye. The equilibrium adsorption data followed the Langmuir adsorption isotherms. The SAPs were also used to adsorb three other dyes, Congo red, Amido black and Alizarin cyanine green. They exhibited different adsorption capacity for different dyes. The adsorption phenomenon was found to follow first order kinetics. In the later part of the study, the co-monomers of [2 - (Methacryloyloxy) ethyl] trimethylammonium chloride with zwitter-ionic monomers [2-(Methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide and [3-(Methacryloylamino)propyl]dimethyl(3-sulfopropyl)ammonium hydroxide inner salt were prepared in turns at two different concentrations. The effect of the addition of the zwitter-ionic monomers and their concentration of the swelling capacity and dye adsorption capacity was studied. There was no effect on the swelling capacity of the polymers due to either the species of the zwitter-ionic monomer or their concentration. However, there was a reduction in soluble content of the polymers. The dye adsorption capacity decreased at the higher concentration of the zwitter-ionic monomer.
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