Applied Chemistry for Engineering, Vol.25, No.1, 96-102, February, 2014
입상활성탄에 의한 메타닐 옐로우 염료의 흡착에 대한 평형, 동력학 및 열역학 파라미터에 관한 연구
Equilibrium, Kinetics and Thermodynamic Parameters Studies on Metanil Yellow Dye Adsorption by Granular Activated Carbon
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초록
입상활성탄에 대한 metanil yellow의 흡착은 흡착제의 양, pH, 초기농도, 접촉시간과 흡착온도를 조작변수로 선택하여 회분식 실험으로 연구되었다. 흡착평형자료는 Langmuir와 Freundlich 흡착등온식에 대한 적합성을 평가하였다. 흡착평형은 Freundlich 흡착등온식이 더 잘 맞았으며, 계산된 분리계수 값으로부터 입상활성탄이 metanil yellow를 효과적으로 처리할 수 있다는 것을 알 수 있었다. 동력학적 실험으로부터, 흡착공정은 유사이차반응속도식에 잘 맞으며, 속도상수(k2) 값은 초기농도가 증가할수록 감소하였다. 활성화 에너지, 엔탈피, 엔트로피 및 Gibbs 자유에너지 변화와 같은 열역학 파라미터들은 흡착공정의 특성을 평가하기 위하여 298∼318 K의 온도 범위에서 조사하였다. 활성화 에너지의 계산 값은 23.90 kJ/mol로 입상활성탄에 대한 metanil yellow의 흡착이 물리적 공정임을 나타냈다. Gibbs 자유에너지 변화의 음수값(ΔG = -2.16∼-6.55 kJ/mol)과 엔탈피 변화의 양수값(ΔH = +23.29 kJ/mol)은 각각 흡착공정이 자발적 공정 및 흡열과정임을 나타냈다.
Adsorption of metanil yellow onto granular activated carbon were studied in a batch system. Various operation parameters such as adsorbent dosage, pH, initial concentration, contact time and temperature were optimized. Experimental equilibrium adsorption data were analyzed by Langmuir and Freundlich adsorption isotherm. The equilibrium process was described well by Freundlich isotherm model. From determined separation factor (1/n), adsorption of metanil yellow by granular activated carbon could be employed as effective treatment method. By analysis of kinetic experimental data, the adsorption process were found to confirm to the pseudo second order model with good correlation and the adsorption rate constant (k2) decreased with increasing initial concentration. Thermodynamic parameters like activation energy, change of free energy, enthalpy, and entropy were also calculated to predict the nature adsorption in the temperature range of 298∼318 K. The activation energy was determined as 23.90 kJ/mol. It was found that the adsortpion of metanil yellow on the granular activated carbon was physical process. The negative Gibbs free energy change (ΔG = -2.16∼-6.55 kJ/mol) and the positive enthalpy change (ΔH = +23.29 kJ/mol) indicated the spontaneous and endothermic nature of the adsorption process, respectively.
Keywords:metanil yellow;dye adsorption;activated carbon adsorption;adsorption kinetics;adsorption equilibrium
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