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Effect of sodium montmorillonite nanoclay on the water absorbency and cationic dye removal of carrageenan-based nanocomposite superabsorbents

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Abstract

Nanocomposite superabsorbents were synthesized by simultaneously solution copolymerization of acrylamide (AAm) and sodium acrylate (Na-AA) in the presence of carrageenan biopolymer and sodium montmorillonite (Na-MMt) nanoclay. Potassium persulfate (KPS) and methylenebisacrylamide (MBA) were used as initiator and crosslinker, respectively. The structure and morphology of the nanocomposites were investigated using XRD, FTIR, scanning electron microscopy (SEM), and TEM techniques. The influence of nanoclay and carrageenan contents as well as monomer weight ratios on the degree of swelling of nanocomposites was studied. The optimum water absorbency was obtained at 10 wt% of clay, 10 wt% of carrageenan, and 1:1 of monomers weight ratio. The obtained nanocomposites were examined to remove of crystal violet (CV) cationic dye from water. The effect of carrageenan and clay content on the speed of dye adsorption revealed that while the rate of dye adsorption is enhanced by increasing the clay content up to 14 wt% of clay, it was decreased as the carrageenan increased in nanocomposite composition. The results showed that the pseudo-second-order adsorption kinetic was predominated for the adsorption of CV onto nanocomposites. The experimental equilibrated adsorption capacity of nanocomposites was analyzed using Freundlich and Langmuir isotherm models. The results corroborated that the experimental data fit the Freundlich isotherm the best.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, University of Maragheh, P.O. Box 55181-83111, Maragheh, Iran

    Gholam Reza Mahdavinia

  2. Department of Chemistry, Faculty of Science, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran

    Bakhshali Massoumi & Karim Jalili

  3. School of Engineering-Emerging Technologies, Tabriz University, Tabriz, Iran

    Gholamreza Kiani

Authors
  1. Gholam Reza Mahdavinia
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  2. Bakhshali Massoumi
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  3. Karim Jalili
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  4. Gholamreza Kiani
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Correspondence to Gholam Reza Mahdavinia.

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Mahdavinia, G.R., Massoumi, B., Jalili, K. et al. Effect of sodium montmorillonite nanoclay on the water absorbency and cationic dye removal of carrageenan-based nanocomposite superabsorbents. J Polym Res 19, 9947 (2012). https://doi.org/10.1007/s10965-012-9947-9

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  • DOI: https://doi.org/10.1007/s10965-012-9947-9

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