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http://dx.doi.org/10.7464/ksct.2020.26.2.122

Characteristics of Isotherm, Kinetic, and Thermodynamic Parameters for Reactive Blue 4 Dye Adsorption by Activated Carbon  

Lee, Jong-Jib (Department of Chemical Engineering, Kongju National University)
Publication Information
Clean Technology / v.26, no.2, 2020 , pp. 122-130 More about this Journal
Abstract
The isotherm, kinetic, and thermodynamic parameters of reactive blue 4 adsorbed by activated carbon were investigated for activated carbon dose, pH, initial concentration, contact time, and temperature data. The adsorption of the RB 4 dye by activated carbon showed a concave shape in which the percentage of adsorption increased in both directions starting from pH 7. The isothermal adsorption data were applied to Langmuir, Freundlich, and Temkin isotherms. Both Freundlich and Langmuir isothermal adsorption models fit well. From determined Freundlich separation factor (1/n = 0.125 ~ 0.232) and Langmuir separation factor (RL = 1.53 ~ 1.59), adsorption of RB 4 by activated carbon could be employed as an effective treatment method. The constant related to the adsorption heat (BT = 2.147 ~ 2.562 J mol-1) of Temkin showed that this process was physical adsorption. From kinetic experiments, the adsorption process followed the pseudo second order model with good agreement. The results of the intraparticle diffusion model showed that the inclination of the first straight line representing the surface diffusion was smaller than that of the second straight line representing the intraparticle pore diffusion. Therefore, it was confirmed that intraparticle pore diffusion is the rate-controlling step. The negative Gibbs free energy change (ΔG = -3.262 ~ -7.581 kJ mol-1) and the positive enthalpy change (ΔH = 61.08 kJ mol-1) indicated the spontaneous and endothermic nature of the adsorption process, proving this process to be spontaneous and endothermic.
Keywords
Activated carbon; Adsorption kinetics; Dye adsorption; Reactive blue 4; Thermodynamic parameter;
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Times Cited By KSCI : 4  (Citation Analysis)
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