Abstract
The present work deals with the removal of highly toxic manganese ion from aqueous solution using cation exchange resins namely, Amberjet 1500H, Amberjet 1300H and Amberlite IRC86. The study was carried out in media of various ionic strengths (1.98-9.98 mmol/L), different resin dose (0.25-8.0 gm) and a wide solution acidity range (0.001-1.0 M), in addition to at three temperatures (293-318 K).The aim of this study was to understand the mechanisms that govern manganese removal and find a suitable equilibrium isotherm and kinetic model for the manganese removal in a batch reactor. The experimental isotherm data were analyzed using the Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D–R) equations. The experimental data were analyzed using four adsorption kinetic models – the pseudo first- and second-order, intraparticle diffusion and the Elovich equations – to determine the best fit equation for the adsorption of manganese ions onto the resins. The rate constants, equilibrium capacities and related correlation coefficients for each kinetic model were calculated and discussed. Also, predicted qt values from the kinetic equations were compared with the experimental data. Thermodynamic parameters, involving ΔH, ΔS and ΔG were also calculated from graphical interpretation of the experimental data
Highlights
Heavy metal contamination in water is a global problem
The adsorption process is often recommended for the removal of metal ions when they are present at low concentrations[1,2,3]
The adsorption studies were carried out by varying time interval (5.0–420 min) at 5.98 mmol/l concentration of the manganese ion to optimize the time required for the removal of this metal ion from its solution
Summary
The present work deals with the removal of highly toxic manganese ion from aqueous solution using cation exchange resins namely, Amberjet 1500H, Amberjet 1300H and Amberlite IRC86. The study was carried out in medium of various ionic strengths (1.98 to 9.98 mmol/L), different resin dose (0.25 to 8.0 gm) and a wide solution acidity range (0.001 to 1.0 M), in addition to at three temperatures (293, 308 and 318 K).The aim of this study was to understand the mechanisms that govern manganese removal and find a suitable equilibrium isotherm and kinetic model for the manganese removal in a batch reactor. The experimental data were analyzed using four adsorption kinetic models – the pseudo first- and second-order, intraparticle diffusion and the Elovich equations – to determine the best fit equation for the adsorption of manganese ions onto the resins. Thermodynamic parameters, involving ΔH, ΔS and ΔG were calculated from graphical interpretation of the experimental data
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