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    Fast removal of methylene blue and Hg(II) from aqueous solution using a novel super-adsorbent containing residues of glycine and maleic acid

    Year: 2019

    Journal: J. Hazard. Mater., Volume 369, MAY 5, page 642–654

    Authors: Ali, Shaikh A.; Yaagoob, Ibrahim Y.; Mazumder, Mohammad A. J.; Al-Muallem, Hasan A.

    Organizations: Deanship of Scientific Research (DSR), KFUPM, Saudi Arabia [IN161036]

    Keywords: Cyclopolymerization; Adsorption; Chelating resin; Methylene blue removal; Hg(II) removal

    The alternate cyclo-copolymerization of diallylammonioethanoate [(CH2= CHCH2)(2)NCH2CO2-] and maleic acid in the presence of a cross-linker afforded a novel pH-responsive resin (90% yield). The resin has turned out to be a super-adsorbent for methylene blue (MB) removal with a q(max) of 2101 mg g(-1). The adsorption of the dye followed pseudo second-order kinetics with an energy of activation (E-a) of 31.5 kJ mol(-1). The process showed an extraordinarily fast adsorption rate owing to faster film diffusion; the resin (250 mg) was able to trap 78 and 99.4% MB from its 3000 mg L-1 solution (100 mL) within 3 and 30 min, respectively. Equilibrium constants from Langmuir nonlinear isotherm model in the range 288-328 K gave Delta G degrees Delta H degrees, and Delta S degrees values of approximate to -25 kJ, -13 kJ and 39.5 J mol(-l) K-1, respectively. Immobilization mechanism was discussed using FTIR, SEM, and Elovich kinetic model. The presence of the chelating glycine residues was exploited for the removal of Hg(II) ions; the q(Hg) was determined to be 263 mg g(-1). The resin also removed MB and Hg(II) simultaneously from industrial wastewater with remarkable efficacy. The very impressive performance along with efficient recycling conferred the resin a top position among many sorbents.
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