Abstract
The described research examined the adsorption of fluoride ions from solution immobilized onto an aluminum oxide-coated bacterial cellulose-based composite material in which aluminum oxide had been deposited using ALD technology. The kinetic regularities of the adsorption of fluoride ions from the solution as well as the mechanism of the processes were analyzed. The established equations show that the dynamics of adsorption correspond to first-order kinetics. Based on the Langmuir adsorption isotherms, we defined the adsorption equilibrium constants, parameter maximum adsorption, and change in Gibbs free energy. It is shown that, with increasing temperature, an increase in the reaction rate is constant, both forward and reverse. This testifies to the activated character of adsorption of the first fluoride on the surface of the sorbent based on bacterial cellulose modified with an alumina nanolayer. The activation energy of the desorption process is higher than the activation energy of the adsorption process, which characterizes the adsorption as ionic. The negative value of entropy indicates that in the course of sorption, an adsorption complex “aluminum-fluorine” is formed, where the system is more ordered than the initial system in which fluorine ions are in solution. The limiting stages of the process are revealed. The high sorption capacity of the resulting bacterial cellulose-based composite material obtained by means of biosynthesis through cultivation of the bacterium Komagataeibacter sucrofermentans B-11267 was demonstrated.
Highlights
Fluoride is known to have both a beneficial and harmful effect on human health.Fluoride concentration in between 0.4 and 1.0 mg L−1 has a beneficial effect, as it protects us from tooth decay by promoting calcification of dental enamel [1]
To select the adsorption duration time at which, all other things being equal, it can be assumed that adsorption equilibrium had occurred, we modeled the dependence of the Fluoride ions adsorption value on time
The kinetic regularities of fluoride ions adsorption from solution by a bacterial cellulose-based modified sorbent were studied. In this case, the adsorption can be described by kinetic equations of the first order
Summary
Fluoride is known to have both a beneficial and harmful effect on human health.Fluoride concentration in between 0.4 and 1.0 mg L−1 has a beneficial effect, as it protects us from tooth decay by promoting calcification of dental enamel [1]. Reporting high concentrations of fluoride in drinking water [2,3]. Many treatment methods such as electrodialysis [5], ion exchange [6], adsorption [7,8,9], chemical precipitation, and coagulation [10] have been employed to remove excess fluoride from water. Among the different treatment methods available for removal of the contaminant from water, adsorption has emerged as the most popular and promising technology because of the ease of operation, viability, simplicity of equipment, high efficiency, and low cost of the adsorbents [2,7,11]. The adsorption of ions from solution is used in many industries, primarily for cleaning various solutions by removing pollutants
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