Adsorption of azo dye Congo red on the Sn-doped TiO2 surface

  • I. Mironyuk Vasyl Stefanyk Precarpathian National University
  • M. Myslin Vasyl Stefanyk Precarpathian National University
  • I. Lapchuk Vasyl Stefanyk Precarpathian National University
  • T. Tatarchuk Vasyl Stefanyk Precarpathian National University
  • O. Olkhovyy Jagiellonian University
Keywords: TiO2, adsorption, Congo red, pHPZC

Abstract

In this paper, the effect of SnO2 impurity on the surface charge and adsorption properties of TiO2 samples is investigated. The experimental value of the zero charge point for TiO2 with 3%, 6% and 12% of SnO2 equals 3.53, 3.97 and 3.2, respectively. The adsorption activity of the samples was studied on model solutions of the anionic dye – Congo red. The maximum adsorption capacity (qexp) equals 24.6 mg/g for 3Sn/TiO2, 25.0 mg/g for 6Sn/TiO2 and 39.1 mg/g for 12Sn/TiO2. Langmuir, Freundlich, and Dubinin-Radushkevich models were used to describe the adsorption mechanism of Congo red dye on the surface of Sn/TiO2 samples. Based on the results of the studies of Congo red adsorption by the surface of titanium dioxide doped with Sn, all samples agree best with the Langmuir model. The correlation coefficients for the Langmuir isotherms are in the range of 0.9927 - 0.9996, while the values ​​of R2 for the Freundlich and Dubinin-Radushkevich isotherms are in the range of 0.721 - 0.8329 and 0.8283 - 0.9433, respectively. Experimental data obtained from adsorption isotherms show that the TiO2 sample containing 12% SnO2 is the most active. The best result of Congo red removal occurred at a concentration of Co = 5 mg/l (% of removed dye ≈ 83% for 12Sn/TiO2; 81% for 6Sn/TiO2 and 71% for 3Sn/TiO2). Therefore, the studied samples of TiO2 doped with SnO2 can be used as effective adsorbents of Congo red from aqueous solutions.

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Published
2021-09-26
How to Cite
[1]
MironyukI., MyslinM., LapchukI., TatarchukT. and OlkhovyyO. 2021. Adsorption of azo dye Congo red on the Sn-doped TiO2 surface . Physics and Chemistry of Solid State. 22, 3 (Sep. 2021), 561-567. DOI:https://doi.org/10.15330/pcss.22.3.561-567.
Section
Scientific articles (Chemistry)