Study of the adsorption kinetics of iron ions by modified carbon sorbents
Abstract
The kinetics of the iron (II) ions adsorption from a constant and limited volume by carbon materials is studied. Industrial active anthracite semi-coke based on Purolate-Standard and its samples modified with nitrogen-containing organic compounds of various classes (aminoethanic acid, azepan-2-one or azabenzene) were used as adsorbents. According to the obtained kinetic curves, the time of the onset of adsorption equilibrium is determined. It is established that this characteristic depends on the type of modifier. Thus, the fixation of an amino acid or amide on the surface of the adsorbent significantly reduces the period of reaching the adsorption equilibrium, and increases the heterocyclic compound. The possibility of using kinetic models of Lagergren, as well as Ho and McKay, to describe the adsorption process is considered. Within the framework of these models, the values of equilibrium adsorption and reaction rate constants are calculated. It is shown that the kinetics of adsorption can be reliably described using a pseudo-second-order model. Using the diffusion models of Weber and Morris, as well as Marutovsky, the contribution of external diffusion and diffusion inside the sorbent grain to the speed of the process was estimated. The mixed-diffusion nature of the adsorption of iron ions on both the initial sorbent and modified samples has been established. At the same time, a certain contribution to the overall speed of the process is also made by the stage of interaction of the metal with the functional groups of the sorbent. The coefficients of external diffusion mass transfer necessary for modeling iron adsorption under nonequilibrium conditions have been calculated.
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