Kinetic and thermodynamic studies of the adsorption of heavy metals on to a new adsorbent: coal mine drainage sludge

Cui, M. and Jang, M. and Cho, S.H. and Khim, J. (2010) Kinetic and thermodynamic studies of the adsorption of heavy metals on to a new adsorbent: coal mine drainage sludge. Environmental Technology, 31 (11). pp. 1203-1211. ISSN 0959-3330, DOI

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In this study, we investigated the application of sludge waste obtained from a coal mine drainage treatment facility that treats acid mine drainage (designated as AMD) from metal-mine water. The coal mine drainage sludge (designated as CMDS), which contained 70 goethite and 30 calcite, was utilized as a sorption material for Cu(II) and Zn(II) removal from an aqueous solution of metallic mine drainage. The equilibriums and kinetics were investigated during a series of batch adsorption experiments. The Langmuir model was used to fit the equilibrium data, resulting in the best fits. The removal efficiencies were controlled by solution pH, temperature, initial concentration of heavy metal, sorbent amount and contact time. The pseudo-second-order kinetic model was used to fit the kinetic data, providing a good correlation with the experimental data. The results of a thermodynamic study showed that the activation energies (EA) were 3.75 and 1.75 kJ mol-1 for the adsorption of Cu(II) and Zn(II) on to CMDS at pH 5.5. These values of activation energy could correspond to physisorption. The positive values obtained for both the standard enthalpy change, Î0, and the standard entropy change, ÎS0, suggest that the adsorption of Cu(II) and Zn(II) on to the CMDS was an endothermic reaction and that randomness increased at the solid-liquid interface during the adsorption of Cu(II) and Zn(II) on to the CMDS. The adsorption process also followed a pseudo-second-order kinetic model. © 2010 Taylor & Francis.

Item Type: Article
Additional Information: Cui, Mingcan Jang, Min Cho, Sang-Hyun Khim, Jeehyeong eng Research Support, Non-U.S. Gov't England 2010/11/05 06:00 Environ Technol. 2010 Oct;31(11):1203-11. doi: 10.1080/09593330903573215.
Uncontrolled Keywords: Acid mine drainage, adsorption isotherms, coal mine drainage sludge, kinetics, thermodynamics, Adsorption process, Aqueous solutions, Batch adsorption experiments, Best fit, Coal mine drainage, Contact time, Endothermic reactions, Equilibrium data, Experimental data, Good correlations, Initial concentration, Kinetic data, Langmuir models, Mine drainage, Mine waters, Positive value, Pseudo-second-order kinetic models, Removal efficiencies, Solid-liquid interfaces, Solution pH, Standard enthalpy, Standard entropy, Thermodynamic studies, Acids, Activation energy, Carbonate minerals, Chemicals removal (water treatment), Coal, Coal industry, Copper, Drainage, Dyes, Groundwater, Heavy metals, Kinetic theory, Mining, Phase equilibria, Phase interfaces, Physisorption, Solutions, Sorption, Thermodynamic properties, Waste treatment, Zinc, Zinc compounds, Coal mines, adsorbent, calcium carbonate, ferric hydroxide, heavy metal, metal, water, adsorption, aqueous solution, calcite, coal mine, concentration (composition), goethite, isotherm, numerical model, pH, pollutant removal, reaction kinetics, sludge, thermodynamic property, article, coal mining, concentration (parameters), energy, enthalpy, entropy, equilibrium constant, liquid, solid, temperature, waste, Hydrogen-Ion Concentration, Metals, Heavy, Sewage
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 29 Jan 2014 06:31
Last Modified: 29 Jan 2014 06:31

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