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  • Chem Sci Trans., 2014, 3(1),  pp 93-106  

    DOI:10.7598/cst2014.634

    Research Article

    Assessment of the Adsorption Kinetics and Equilibrium for the Potential Removal of Direct Yellow - 12 Dye Using Jatropha Curcus L. Activated Carbon

  • G.REVATHI, S.RAMALINGAM and P.SUBRAMANIAM
  • Department of Chemistry, Sri Subramanya College of Engineering and Technology, Palani- 624 615, India
    Department of Chemistry, Vivekananda College, Agasteeswaram- 629 701, India
    Department of Chemistry, Aditanar College of Arts and Science, Tiruchendur-628216, India
  • Abstract

    Removal of DY-12 dye from aqueous solutions at different concentrations, pH and effect of contact time by Jatropha Curcus L. (family: Euphorbiaceae) tree leaves activated carbon (JCTC) has been carried out successfully. The percentage of the dye adsorbed was found to be 87.05 % for 1 g of the carbon. Batch adsorption experiments were carried out successfully. The initial pH of the dye solutions was maintained at 7.8. The removal of the dye DY-12 by JCTC increased from 22.65 to 39.31 mgg-1 by increasing the concentration of the dye from 30 to 60 ppm at temperature 27±1 oC and pH 7.8. However, the percentage of the dye adsorbed is decreases from 75.50 to 65.52%, by increasing the concentration of the dye from 30 to 60 ppm. The time required to attain equilibrium in the case of adsorption of dyes is 20 min. It can be seen from the figure that the equilibrium period remains unaltered with the change of initial concentration of the dye solution. The value of RL for the adsorption is nearly 1, indicates that the adsorption process is very favourable. The equilibrium sorption capacity of the dye is 0.361. Volume that could be treated is found to be 261.89 L/g. From column experiments effect of bed depth, contact time analyses were studied. It is found that these plots are linear in nature and obey the linear relationship S = a + bc. The reaction follows a first order kinetics. Rate of adsorption depend on the concentration of dye solution. The data fits into the first order kinetic models of Langmuir, Freundlich, Intra-particle diffusion, Bhattacharya-Venkobhachar equation, Lagergrenís equation, Natarajan Khalaf equation and also obeys Elovich equation, Modified Elovich equation and pseudo second order kinetic equations excellently. The SEM analysis and FT-IR spectrum clearly shows that the adsorption is by the physical forces and not by the chemical combinations.

    Keywords

    Adsorption, JCTC, DY-12 dye, RL factor, Sorption capacity

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