Adsorption of Sr(II) cations onto titanium dioxide, doped with Boron atoms

Ivan Mironyuk; Hanna Vasylyeva; Iryna Prokipchuk; Igor Mykytyn

doi:10.15330/pcss.24.1.114-125

Authors

Ivan Mironyuk Department of Chemistry, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Street, 76018 Ivano-Frankivsk, Ukraine
Hanna Vasylyeva Department of Theoretical Physics, Uzhgorod National University, Uzhgorod, Ukraine
Iryna Prokipchuk Department of Chemistry, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Street, 76018 Ivano-Frankivsk, Ukraine
Igor Mykytyn Department of Chemistry, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Street, 76018 Ivano-Frankivsk, Ukraine

DOI:

https://doi.org/10.15330/pcss.24.1.114-125

Keywords:

Titanium dioxide, Boron, Adsorption, Strontium

Abstract

The adsorption of Sr(II) cations by Boron-doped TiO₂ was investigated. The adsorbent samples were obtained by liquid-phase sol-gel method using the aqua complex precursor [Ті(ОН₂)₆]³⁺‧3Cl^- and modifying reagent hydrogen borate Н₃ВО₃. It was found, that single-phase rutile titanium dioxide or two-phase anatase-rutile oxide materials were formed under the different initial ratios of components. Boron atoms are combined with Oxygen atoms into triangular structural cell ВО₃ in the rutile sample 0.5В-ТіО₂ and are localized in the surface layer of the nanoparticle material as a grouping =О₂ВОН. The introduction of Boron atoms into the structure of the rutile adsorbent causes an increase in its adsorption capacity for the binding of Sr(II) cations in the aqueous electrolyte. The maximal adsorption values for Sr(II) cations by the rutile adsorbent in a neutral electrolyte environment reach 102.3 mg‧g^-1, while it is equal to 68.8 mg‧g^-1 for the unmodified anatase adsorbent a-TiO₂.

The number of acid adsorption centers ≡ТіОН^δ+ on the surface of the rutile adsorbent 0.5В-ТіО₂ is ~ 50 units on a surface area of 10 nm², which is twice the number of centers on the surface of the anatase adsorbent a- ТіО₂. Anatase-rutile adsorbents 1.0В-ТіО₂ and 1.5В-ТіО₂ contain, respectively, 70% and 57% of the anatase phase. They are significantly inferior in adsorption ability toward cations of Sr(II) compared with the rutile adsorbent 0.5В-ТіО₂. This is because Boron atoms are mainly localized in the anatase phase and with oxygen atoms form tetrahedral groups of ВО₄^-.

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