Retention of nickel from aqueous solutions using iron oxide and manganese oxide coated sand: kinetic and thermodynamic studies.
Identifieur interne : 000380 ( Main/Merge ); précédent : 000379; suivant : 000381Retention of nickel from aqueous solutions using iron oxide and manganese oxide coated sand: kinetic and thermodynamic studies.
Auteurs : N. Boujelben [Tunisie] ; J. Bouzid ; Z. Elouear ; M. FekiSource :
- Environmental technology [ 0959-3330 ] ; 2010.
English descriptors
- KwdEn :
- Absorption, Computer Simulation, Ferric Compounds (chemistry), Kinetics, Manganese Compounds (chemistry), Models, Chemical, Nickel (chemistry), Nickel (isolation & purification), Oxides (chemistry), Soil (chemistry), Thermodynamics, Ultrafiltration (methods), Water Pollutants, Chemical (chemistry), Water Pollutants, Chemical (isolation & purification), Water Purification (methods).
- MESH :
- chemical , chemistry : Ferric Compounds, Manganese Compounds, Nickel, Oxides, Soil, Water Pollutants, Chemical.
- chemical , isolation & purification : Nickel, Water Pollutants, Chemical.
- methods : Ultrafiltration, Water Purification.
- Absorption, Computer Simulation, Kinetics, Models, Chemical, Thermodynamics.
Abstract
In this study, the removal of nickel ions from aqueous solutions using iron oxide and manganese oxide coated sand (ICS and MCS) under different experimental conditions was investigated. The effect of metal concentration, contact time, solution pH and temperature on the amount of Ni(II) sorbed was studied and discussed. Langmuir and Freundlich isotherm constants and correlation coefficients for the present systems at different temperatures were calculated and compared. The equilibrium process was well described by the Langmuir isotherm model: the maximum sorption capacities (at 29 K) were 2.73 mg Ni/g and 3.33 mg Ni/g of sorbent for ICS and MCS, respectively. Isotherms were also used to evaluate the thermodynamic parameters (deltaG degrees, deltaH degrees, deltaS degrees) of adsorption. The sorption kinetics were tested for the pseudo-first-order, pseudo-second-order and intra-particle diffusion models. Good correlation coefficients were obtained for the pseudo-second-order kinetic model, showing that the nickel uptake process followed the pseudo-second-order rate expression.
DOI: 10.1080/09593330.2010.482148
PubMed: 21275258
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pubmed:21275258Le document en format XML
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<term>Models, Chemical</term>
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<term>Manganese Compounds</term>
<term>Nickel</term>
<term>Oxides</term>
<term>Soil</term>
<term>Water Pollutants, Chemical</term>
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<front><div type="abstract" xml:lang="en">In this study, the removal of nickel ions from aqueous solutions using iron oxide and manganese oxide coated sand (ICS and MCS) under different experimental conditions was investigated. The effect of metal concentration, contact time, solution pH and temperature on the amount of Ni(II) sorbed was studied and discussed. Langmuir and Freundlich isotherm constants and correlation coefficients for the present systems at different temperatures were calculated and compared. The equilibrium process was well described by the Langmuir isotherm model: the maximum sorption capacities (at 29 K) were 2.73 mg Ni/g and 3.33 mg Ni/g of sorbent for ICS and MCS, respectively. Isotherms were also used to evaluate the thermodynamic parameters (deltaG degrees, deltaH degrees, deltaS degrees) of adsorption. The sorption kinetics were tested for the pseudo-first-order, pseudo-second-order and intra-particle diffusion models. Good correlation coefficients were obtained for the pseudo-second-order kinetic model, showing that the nickel uptake process followed the pseudo-second-order rate expression.</div>
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