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Study on Equilibrium, Kinetic and Thermodynamic for Adsorption of Coomassi Brilliant Blue G Using Activated Carbon

입상 활성탄에 의한 Coomassi Brilliant Blue G의 흡착에 대한 평형, 동력학 및 열역학에 관한 연구

  • Lee, Jong-Jib (School of Chemical Engineering, Kongju National University)
  • 이종집 (공주대학교 화학공학부)
  • Received : 2014.07.14
  • Accepted : 2014.09.17
  • Published : 2014.09.30

Abstract

Batch adsorption studies were carried out for equilibrium, kinetics and thermodynamic parameters for adsorption of coomassi brilliant blue G (CBBG) using activated carbon with varying the operating variables like initial concentration, contact time and temperature. Equilibrium adsorption data were fitted into Langmuir, Freundlich and Dubinin-Radushkevich isotherms. From estimated separation factor of Langmuir and Freundlich, this process could be employed as effective treatment for removal of CBBG. Also from Dubinin-Radushkevich isotherm model, adsorption energy (E) indicated adsorption process is physical adsorption. From kinetic experiments, the adsorption reaction was found to confirm to the pseudo second order model with good correlation. Intraparticle diffusion was rate controlling step. Thermodynamic parameters like change of free energy, enthalpy, and entropy were also calculated to predict the nature of adsorption. The change of enthalpy (406.12 kJ/mol) indicated endothermic nature of the adsorption process. The change of entropy (1.66 kJ/mol K) showed increasing disorder in process. The change of free energy found that the spontaneity of process increased with increasing adsorption temperature.

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