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Application of silica gel/polyaniline composite for adsorption of ascorbic acid from aqueous solutions

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Abstract

Silica gel and a chemically modified silica gel with polyaniline (PAN) were used for adsorption of ascorbic acid (AA) from aqueous solutions. The surface morphology of the adsorbents was studied by scanning electron microscopy (SEM). Adsorption experiments were carried out using both batch and columnar systems. In batch system, the effects of some important parameters such as sorbent dose, contact time, initial concentration and temperature of the adsorbate were studied. Based on regression analysis, the sorption data obtained for SiO2 were best represented by Freundlich isotherm and for the PAN/SiO2 composite, the equilibrium sorption data were fitted better by Langmuir isotherm. The kinetic studies showed that the adsorption of AA on both sorbents follows pseudo second-order kinetics which implies a chemisorption mechanism and according to diffusion model, intra-particle diffusion is the rate-controlling step. The thermodynamic studies also showed that PAN/SiO2 is a more effective adsorbent to adsorb AA than an unmodified SiO2. In columnar mode, the effects of salt on breakthrough curve were investigated. Two kinetic models, Thomas and Adams–Bohart, were applied to experimental data to predict the breakthrough curves using linear regression and determine the characteristic parameters of the column. Error analysis was carried out to investigate the adequacy and accuracy of the model equations. Desorption study showed that the adsorbed ascorbic acid is readily eluted from the column using dilute solution of NaOH. PAN/SiO2 was found to be a promising solid phase adsorbent to preconcentrate ascorbic acid from aqueous solutions and subsequent analysis.

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Acknowledgments

The authors would like to acknowledge financial support from the Postgraduate Studies of University of Guilan, Iran.

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Authors and Affiliations

  1. Department of Chemistry, University of Guilan, PO Box: 41635-1914, Rasht, Iran

    Reza Ansari, Nina Alizadeh & Seyedeh Malahat Shademan

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  1. Reza Ansari
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  2. Nina Alizadeh
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  3. Seyedeh Malahat Shademan
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Correspondence to Reza Ansari.

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Ansari, R., Alizadeh, N. & Shademan, S.M. Application of silica gel/polyaniline composite for adsorption of ascorbic acid from aqueous solutions. Iran Polym J 22, 739–748 (2013). https://doi.org/10.1007/s13726-013-0172-0

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  • DOI: https://doi.org/10.1007/s13726-013-0172-0

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