| Abstract |
| In this study, the adsorption process parameters of direct yellow 9 (DY 9) dye by activated carbon in an aqueous solution were measured using adsorption variables that included adsorbent dose, pH, contact time, initial concentration and temperature. The adsorption equilibrium data were applied to the Langmuir, Freundlich, Temkin, and Halsey equations. The adsorption equilibrium data can be described well using the four isotherm models. The Langmuir separation coefficient (RL=0.549~0.859) and the Freundlich constant (1/n=0.780~0.998) were evaluated to confirm that the adsorption of DY 9 by activated carbon was an effective treatment method. The Temkin constant (BT=2.147~2.562 J/mol) and Dubinin-Radushkevich constant (E=0.211~0.255 kJ/mol) showed that this process was associated with physical adsorption. The kinetic experimental results showed that the adsorption process fits well to a pseudo-second-order model. Because the activation energy equals 30.97 kJ/mol and the reaction has a positive enthalpy (16.685 kJ/mol), the adsorption of DY 9 by activated carbon is a physisorption process and is also endothermic. The negative Gibbs free energy (ΔG= -5.316~-3.958 kJ/mol) indicates that the adsorption process is spontaneous. |
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| Key Words |
| Activated carbon, Adsorption, Direct Yellow 9, Dye adsorption, Kinetic, 활성탄, 흡착, 다이렉트 옐로우 9, 염료흡착, 동력학 |
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