Kinetics and Mechanism of Methylene Blue Adsorption by a TiO2/Diatomite Nanocomposite and Its Components

A study was made of the kinetics of the adsorption of the methylene blue dye from an aqueous solution on the photocatalyst DDT (nanosized titanium dioxide in the anatase phase, deposited on diatomite) and its components: diatomite D and anatase TiO 2 . The effect of the initial concentration and pH...

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Bibliographic Details
Published in:Surface engineering and applied electrochemistry 2023-12, Vol.59 (6), p.772-779
Main Authors: Datsko, T. Ya, Zelentsov, V. I.
Format: Article
Language:English
Subjects:
Adsorption
Anatase
Aqueous solutions
Chemical reactions
Constraining
Diatomaceous earth
Diffusion
Engineering
Kinetics
Machines
Manufacturing
Methylene blue
Nanocomposites
Processes
Surface chemistry
Titanium dioxide
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Summary:A study was made of the kinetics of the adsorption of the methylene blue dye from an aqueous solution on the photocatalyst DDT (nanosized titanium dioxide in the anatase phase, deposited on diatomite) and its components: diatomite D and anatase TiO 2 . The effect of the initial concentration and pH of the methylene blue solution on the rate of the adsorption process was investigated. The kinetic data of adsorption were processed using two simplified kinetic models, one of the pseudo-first-order and the other of pseudo-second-order. To investigate the adsorption mechanism, a model of intraparticle diffusion kinetics was employed. The adsorption kinetics of methylene blue on the surfaces of D, TiO 2 , and DDT was found to be best described by the pseudo-second-order model. It was shown that the adsorption of methylene blue on the D and DDT adsorbents is a multistep process involving adsorption on the external surface and inside particles, with the limiting step being a chemical reaction. For the adsorption on TiO 2 , the limiting step is the external diffusion.
ISSN:1068-3755
1934-8002
DOI:10.3103/S1068375523060078