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http://dx.doi.org/10.14478/ace.2015.1081

Equilibrium, Kinetics and Thermodynamics Studies about Adsorption of Safranin by Granular Activated Carbon  

Lee, Jong Jib (Division of chemical Engineering, Kongju National University)
Publication Information
Applied Chemistry for Engineering / v.26, no.5, 2015 , pp. 581-586 More about this Journal
Abstract
Adsorption of Safranin using granular activated carbon from aqueous solution was investigated. Batch experiments were carried out as a function of adsorbent dose, initial concentration, contact time and temperature. The equilibrium adsorption data were fitted to Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. Based on an estimated Langmuir separation factor, $R_L=0.183{\sim}0.254$ and a Freundlich separation factor, 1/n = 0.518~0.547, this process could be employed as an effective treatment method. Adsorption data were also modeled using the pseudo-first and second-order kinetic equations. It was shown that the pseudo-second-order kinetic equation could best describe the adsorption kinetics. The negative Gibbs free energy (${\Delta}G=-3.688{\sim}-7.220kJ/mol$) and positive enthalpy (${\Delta}H=33.126kJ/mol$) indicated that the adsorption process was spontaneous and endothermic.
Keywords
safranin; dye adsorption; adsorption; adsorption kinetic; adsorption thermodynamics;
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Times Cited By KSCI : 3  (Citation Analysis)
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