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Adsorption Thermodynamics, Kinetics and Isosteric Heat of Adsorption of Rhodamin-B onto Granular Activated Carbon

입상 활성탄에 의한 Rhodamin-B의 흡착 열역학, 동력학 및 등량 흡착열에 관한 연구

  • Lee, Jong Jib (Division of chemical Engineering, Kongju National University)
  • 이종집 (공주대학교 화학공학부)
  • Received : 2016.02.15
  • Accepted : 2016.03.18
  • Published : 2016.04.10

Abstract

The adsorption of Rhodamine-B dye using granular activated carbon from aqueous solution was investigated. Adsorption experiments were carried out as a function of the adsorbent dose, pH initial concentration, contact time and temperature. The equilibrium adsorption data showed a good fit to Langmuir isotherm model. Based on the estimated Langmuir separation factor ($R_L$ = 0.0164~0.0314), our adsorption process could be employed as an effective treatment method. The kinetics of adsorption followed the pseudo first order model. Also, the negative values of Gibbs free energy (-4.51~-13.44 kJ/mol) and positive enthalpy (128.97 kJ/mol) indicated that the adsorption was spontaneous and endothermic process. The isosteric heat of adsorption increased with increase in the surface loading indicating lateral interactions between the adsorbed dye molecules.

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