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Kinetics and mechanism of the adsorption of the drug molsidomine on phenyl-modified mesoporous silica materials at different pH

  • Physical Chemistry of Surface Phenomena
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Abstract

Experimental kinetic isotherms of adsorption for the drug molsidomine on phenyl-modified and unmodified mesoporous silica materials at pH 4.8, 6.0, 7.4, and 8.0 are obtained. It is shown that a pseudo-second-order model offers the best fit to the kinetic isotherms (with a correlation coefficient of >0.99) for all of the studied materials and at virtually all pH. The effects of synthesis route of the phenyl-modified silica materials (grafting or co-condesation) and medium pH on the adsorption capacity of the adsorbents and the second-order rate constant are studied. It is found that film diffusion is the rate-limiting step of molsidomine adsorption on phenyl-modified silica materials at all pH, while the role of pore diffusion increases with increasing pH.

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Authors and Affiliations

  1. G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, 153045, Russia

    E. S. Dolinina & E. V. Parfenyuk

Authors
  1. E. S. Dolinina
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  2. E. V. Parfenyuk
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Correspondence to E. S. Dolinina.

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Original Russian Text © E.S. Dolinina, E.V. Parfenyuk, 2015, published in Zhurnal Fizicheskoi Khimii, 2015, Vol. 89, No. 7, pp. 1164–1171.

This article was translated by the authors.

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Dolinina, E.S., Parfenyuk, E.V. Kinetics and mechanism of the adsorption of the drug molsidomine on phenyl-modified mesoporous silica materials at different pH. Russ. J. Phys. Chem. 89, 1293–1299 (2015). https://doi.org/10.1134/S0036024415070109

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  • DOI: https://doi.org/10.1134/S0036024415070109

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