Applied Chemistry for Engineering, Vol.26, No.5, 581-586, October, 2015
입상 활성탄에 의한 Safranin의 흡착에 관한 평형, 동력학 및 열역학에 관한 연구
Equilibrium, Kinetics and Thermodynamics Studies about Adsorption of Safranin by Granular Activated Carbon
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초록
입상 활성탄을 사용하여 수용액으로부터 Safranin의 흡착에 대해 조사하였다. 회분식 실험은 흡착제의 양, 초기농도와 접촉시간과 온도를 흡착변수로 사용하여 수행하였다. 흡착평형자료는 Langmuir, Freundlich 및 Dubinin-Radushkevich식을 사용하여 해석한 결과 Freundlich식이 가장 좋은 일치도를 나타냈다. 평가된 Langmuir 분리계수, RL = 0.183~0.254와 Freundlich 분리계수, 1/n = 0.518~0.547로부터 이 흡착공정이 적절한 처리방법이 될 수 있음을 알았다. 흡착속도실험자료를 유사1차 및 유사2차 반응속도식에 적용해 본 결과는 유사2차반응속도식에 잘 맞는 것으로 나타났다. 음수값의 Gibbs 자유에너지(△G = -3.688~-7.220 kJ/mol)와 양수값의 엔탈피(△H = 33.126 kJ/mol)는 흡착이 자발적이고 흡열공정으로 진행된다는 것을 나타냈다.
Adsorption of Safranin using granular activated carbon from aqueous solution was investigated. Batch experiments were carried out as a function of adsorbent dose, initial concentration, contact time and temperature. The equilibrium adsorption data were fitted to Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. Based on an estimated Langmuir separation factor, RL = 0.183~0.254 and a Freundlich separation factor, 1/n = 0.518~0.547, this process could be employed as an effective treatment method. Adsorption data were also modeled using the pseudo-first and second-order kinetic equations. It was shown that the pseudo-second-order kinetic equation could best describe the adsorption kinetics. The negative Gibbs free energy (△G = -3.688~-7.220 kJ/mol) and positive enthalpy (△H = 33.126 kJ/mol) indicated that the adsorption process was spontaneous and endothermic.
- Clarke EA, Anliker R, Organic dyes and pigments handbook of environmental chemistry, anthropogenic compounds, part A, vol. 3, 181, Springer-Verlag, New York (1980).
- Gupta VK, Mittal A, Jain R, Mathur M, Sikarwar S, J. Colloid Interface Sci., 303(1), 80 (2006)
- Kaur S, Rani S, Mahajan RK, Asif M, Gupta VK, J. Ind. Eng. Chem., 22, 19 (2015)
- Ghaedi M, Hajjati S, Mahmudi Z, Tyagi I, Agarwal S, Maity A, Gupta VK, Chem. Eng. J., 268, 28 (2015)
- Rotte NK, Yerramala S, Boniface J, Srikanth VVSS, Chem. Eng. J., 258, 412 (2014)
- Zaghbani N, Hafiane A, Dhahbi M, Desalination, 222(1-3), 348 (2008)
- Shao L, Cheng XQ, Liu Y, Quan S, Ma J, Zhao SZ, Wang KY, J. Membr. Sci., 430, 96 (2013)
- Mahmoudi K, Hosni K, Hamdi N, Srasra E, Korean J. Chem. Eng., 32(2), 274 (2015)
- Lee JJ, Appl. Chem. Eng., 25(1), 96 (2014)
- Ghaedi M, Hossainian H, Montazerozohori M, Shokrollahi A, Shojaipour F, Soylak M, Purkait MK, Desalination, 281, 226 (2011)
- Jain M, Garg VK, Kadirvelu K, J. Hazard. Mater., 162(1), 365 (2009)
- Tan IAW, Ahmad AL, Hameed BH, J. Hazard. Mater., 154(1-3), 337 (2008)