Adsorption of Mo(VI) and Re(VII) ions on silica modified with Versatic acid dimethyl hydrazides
Abstract
The article presents the results of studying the adsorption processes of molybdenum (VI) and rhenium (VII) ions from silicon dioxide-based model solutions which had been obtained from waste sludge at copper-nickel production and modified with fraction C10–19 of tertiary carboxylic Versatic acid dimethyl hydrazides. It studied the influence of the modifier and modification conditions on adsorption equilibria at different acidities of the medium. It was shown that the treatment of the silica surface with dimethyl hydrazides leads to an increase in its adsorption capacity with regard to molybdenum (VI) ions and a shift in the pH range for the maximum extraction of rhenium (VII) ions. It considered the possibility of adsorption separation of Mo(VI) and Re(VII) ions in their joint presence from solutions of different acidity. The kinetic and thermodynamic parameters of adsorption were determined at 296, 313, and 333 K. To establish the limiting stage of the process, the obtained adsorption capacity – time dependences were processed using the equations of internal and external diffusion kinetics and the Weber-Morris intraparticle diffusion model. The adsorption rate constants for Mo(VI) and Re(VII) ions were calculated for the pseudo-first and pseudo-second order equations. The obtained adsorption isotherms for molybdate and perrhenate ions were processed in the coordinates of the Langmuir and Freundlich equations and the main parameters for each model were determined. Using the Langmuir adsorption equilibrium constants for various temperatures, the thermodynamic adsorption parameters were calculated. Negative values of integral entropy and Gibbs energies indicate exothermic and spontaneous extraction of both Mo(VI) and Re(VII). To establish the nature of the sorbent interaction with adsorbates, the differential enthalpies of ion adsorption were calculated. Their values (less than 10 kJ/mol) indicate that the adsorption of both molybdate and perrhenate ions on the studied sorbent was mainly due to physical forces. What is more, the adsorption of molybdenum (VI) ions had higher valuesof kinetic and equilibrium characteristics than the adsorption of rhenium (VII) ions. As the temperature increased, the equilibrium for both ions shifted towards desorption.
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