Adsorption of Barium and Zinc Ions by Mesoporous TiO2 with Chemosorbed Carbonate Groups

H. Vasylyeva; I. Mironyuk; I. Mykytyn; N. Danyliyk

doi:10.15330/pcss.20.3.282-290

Authors

H. Vasylyeva Uzhgorod National University
I. Mironyuk Vasyl Stefanyk Precarpathian National University
I. Mykytyn Vasyl Stefanyk Precarpathian National University
N. Danyliyk Uzhgorod National University

DOI:

https://doi.org/10.15330/pcss.20.3.282-290

Keywords:

mesoporous TiO2, adsorption, zinc, barium

Abstract

In the present paper the mesoporous TiO₂ with chemosorbed carbonate groups was investigated as an adsorbent for the removal of Zn²⁺ and Ba²⁺ cations from aqueous solutions. The dependence of the adsorption values of Zn²⁺ and Ba²⁺ on the agitation time, solution’s acidity, and modification of surface of TiO₂ was determined. The process of Zn²⁺ and Ba²⁺adsorption fit well by Lagergren’s pseudo-second-order kinetic model. The equilibrium adsorption was investigated in the concentration of heavy metal’s ranges 27.46 mg/L - 7809 mg/L. The experimental data was approximated by Langmuir and DubininRadushcevich adsorption theories. The energy of adsorption Zn²⁺ and Ba²⁺ onto modified TiO₂ and unmodified TiO₂ was calculated using Dubinin-Radushkevich equations, and was found to be 15.82 - 9.399 kJ/mol, which corresponds to the mechanism of physical adsorption. The application of Langmuir theory to experimental adsorption data gives high R2, close to unit. Separation factor RL indicates, that adsorption Zn²⁺ and Ba²⁺ onto modified TiO₂ is very favorable. Modified mesoporous ТіО₂ is very efficient adsorbent toward Zn²⁺ and Ba²⁺ cations from their individual solutions as well as from their mixture, and able to compete with the best world analogues.

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