Structural, morphological, and adsorption properties of titanium dioxide doped with Fluorine

Editorial Board PCSS Journal; Hanna Vasylyeva; Ivan Mironyuk; Igor Mykytyn

doi:10.15330/pcss.26.2.267-276

Authors

Hanna Vasylyeva Uzhhorod National University, Uzhhorod, Ukraine
Ivan Mironyuk Department of Chemistry, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
Igor Mykytyn Department of Chemistry, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine https://orcid.org/0000-0002-5283-6710

DOI:

https://doi.org/10.15330/pcss.26.2.267-276

Keywords:

adsorption, sol-gel synthesis, titanium dioxide, specific surface, pHpzc, strontium

Abstract

This work is devoted to synthesizing titanium dioxide doped with Fluorine and investigating its structural, morphological, and adsorption properties. By sol-gel synthesis, samples of TiO₂ from 2, 4, and 8 wt. mass of Fluorine, labeled as 2F-TiO₂, 4F-TiO₂, and 8F-TiO₂, were created. To obtain these samples, NaF was injected into an aqueous solution of titanium aqua-complex [Ti(OH₂)₆]³⁺‧3Cl^- with a pH of ~ 0.5÷1.5. XRD, IR spectrometry, low-temperature N₂ adsorption-desorption isotherms, and pH of point of zero charges of as-synthesized samples were performed. A description of the structure-forming process is also given. The adsorption capacity of 2F-TiO₂, 4F-TiO_2, and 8F-TiO₂ samples toward strontium cations was investigated. The adsorption kinetics, equilibrium adsorption, and the effect of the solution's acidity on this process were measured. It was found that 8F-TiO₂ has the most potent adsorption properties toward strontium cations. The paper concludes that as the mass fraction of Fluorine atoms in TiO₂ increases, the number of acid adsorption centers ≡TiOH^δ+ increases. Compared to the basic sample of a-TiO₂, the number of adsorption centers in the 8F-TiO₂ sample increases by 3.5 times.

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