Open AccessKinetics and equilibrium study of chromium adsorption on zeoliteNaX
Author(s) -
Pankaj Pandey,
S. K. Sharma,
С. С. Самби
Publication year - 2010
Publication title -
international journal of environmental science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 75
eISSN - 1735-2630
pISSN - 1735-1472
DOI - 10.1007/bf03326149
Subject(s) - adsorption , hexavalent chromium , chromium , freundlich equation , gibbs free energy , chemistry , langmuir , kinetics , exothermic reaction , thermodynamics , langmuir adsorption model , inorganic chemistry , organic chemistry , physics , quantum mechanics
This study aims to report Batch adsorption study of hexavalent chromium, Cr (VI) on zeoliteNaX. Kinetics of Cr (VI) adsorption and adsorption isotherms were determined by varying operating parameters such as pH, initial concentration, temperature and contact time. ZeoliteNaX was found to remove Cr (VI) in acidic solutions down to ppm level at pH of about 4. Removal rate of Cr (VI) was found to decrease as pH rises above 4.0. Langmuir, Freundlich, Temkin and Redlich-Peterson models were applied to adsorption equilibrium data to find the best amongst these models. Langmuir model with R = 0.9711 best fits the adsorption data. The kinetics of adsorption was found to follow the first order reversible reaction. The separation parameter, R values of less than 1.0 i.e., 0.7369, 0.5834 and 0.4828 corresponding to initial concentrations of 10, 20 and 30 mg/L, respectively indicated that adsorption of Cr (VI) on zeoliteNaX is favoured. The estimated values of thermodynamic parameters such as heat of adsorption and standard gibbs free energy confirmed the exothermic nature of adsorption of Cr (VI) on zeoliteNaX.
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