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Kinetic and Equilibrium Modeling of the Adsorption of Amaranth from aqueous solution onto Smectite Clay

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Author Affiliations

  • 1Physical and Theoretical Chemistry Laboratory, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, CAMEROONSoil
  • 2 Soil, Plant and Water Analysis Laboratory, Institute of Agricultural Research for Development (IRAD), PMB 25 Buea, CAMEROON

Res.J.chem.sci., Volume 4, Issue (2), Pages 7-14, February,18 (2014)

Abstract

The capability of smectite clay (Sa01) was investigated as a low cost adsorbent for the adsorption of a hazardous water soluble dye amaranth from aqueous solutions. Using the batch mode process, the effect of contact time, initial dye concentration (Co), adsorbent dosage and pH was also investigated at room temperature of 25°C. It was observed that after 40 minutes equilibrium was attained and the percentage removal of dye decreased as initial pH was increased. Increasing the mass of the adsorbent resulted to an increase in the percentage of dye uptake (%R). The adsorption percentages were higher at lower initial concentrations of amaranth. 83.6% of dye was adsorbed at pH 2, adsorbent mass of 1.0 g and initial dye concentration of 30 mg/L. Langmuir and Freundlich isotherm models were used to explain the experimental data. Although equilibrium data were found to follow both isotherm models, the Freundlich model had the better correlation with the experimental data (R2 = 0.9894). Pseudo-first-order and pseudo-second-order kinetic models were used to analyze the adsorption kinetics. The pseudo-second-order kinetic model was found to agree well with the experimental data (R2>0.99)

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