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

  • H. Vasylyeva Uzhgorod National University
  • I. Mironyuk Vasyl Stefanyk Precarpathian National University
  • I. Mykytyn Vasyl Stefanyk Precarpathian National University
  • N. Danyliyk Uzhgorod National University
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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Published
2019-10-18
How to Cite
[1]
VasylyevaH., MironyukI., MykytynI. and DanyliykN. 2019. Adsorption of Barium and Zinc Ions by Mesoporous TiO2 with Chemosorbed Carbonate Groups. Physics and Chemistry of Solid State. 20, 3 (Oct. 2019), 282-290. DOI:https://doi.org/10.15330/pcss.20.3.282-290.
Section
Scientific articles