The study of the adsorption of zinc ions by acid-modified acacia sawdust (Acacia auriculiformis)

  • Fairuza R. Miraftakhova FGBOU VO «Kazan national research technological university», Kazan
  • Nguyen Thi Kim Thoa FGBOU VO «Kazan national research technological university», Kazan
  • Rumiya Z. Galimova FGBOU VO «Kazan national research technological university», Kazan
  • Ildar G. Shaikhiev FGBOU VO «Kazan national research technological university», Kazan
  • Svetlana V. Sverguzova FGBOU VO «Belgorod state university of technology named after V.G. Shukhov, Belgorod
DOI: https://doi.org/10.17308/sorpchrom.2019.19/1174
Keywords: Zn2 ions, Acacia auriculiformis sawdust, H2SO4 solutions, processing, adsorption.

Abstract

The adsorption of Zn2+ ions by native and modified in weakly concentrated (1-3%) H2SO4 solutions
of acacia sawdust (Acacia auriculiformis) was studied. Adsorption isotherm of zinc ions by native acacia
sawdust are type I isotherms, according to the IUPAC classification and L type, according to the Hils classification. The maximum sorption capacity of acacia sawdust for zinc ions is 7.5 mg/g. In order to increase the
sorption parameters, the investigated sawdust was treated with slightly concentrated solutions of sulfuric acid
at 20 °C for 5 hours. With an increase in the concentration of sulfuric acid solution, the sorption capacity of
sawdust for zinc ions increases. It was determined that the treatment of acacia sawdust with 3% H2SO4 solution
increases the maximum sorption capacity for Zn2+ ions from 7.5 to 36.5 mg/g. The adsorption isotherms
obtained were processed using Langmuir, Freindlich, Dubinin-Radushkevich and Temkin models. Regression
equations and approximation coefficients, and thermodynamic parameters of the processes (sorption
energy and Gibbs energy) are determined. Adsorption isotherm with native sawdust is most adequately described
by the Temkin model, modified - the Freundlich model. The values of adsorption energy less than 8
kJ/mol and Gibbs energy in the range from -4 to 0 kJ/mol indicate the occurrence of spontaneous physical
adsorption. The kinetic dependences of the processes of adsorption of zinc ions by native and modified acacia
sawdust are obtained. By processing the kinetic dependencies within the Boyd diffusion model, the Bio
coefficients of the studied processes are calculated, the values of which correspond to the flow of mixed diffusion
processes, that is, the limiting stages of the adsorption processes are both external and internal diffusion.

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Author Biographies

Fairuza R. Miraftakhova, FGBOU VO «Kazan national research technological university», Kazan

undergraduate student of the Department of Environmental Engineering, Kazan National Research Technological University, Kazan

Nguyen Thi Kim Thoa, FGBOU VO «Kazan national research technological university», Kazan

Postgraduate Student, Department of Environmental Engineering, Kazan National Research Technological University, Kazan

Rumiya Z. Galimova, FGBOU VO «Kazan national research technological university», Kazan

Assistant of the Department of Environmental Engineering, Ph.D. tech. Sciences, Kazan National Research Technological University, Kazan, rumiushka666@mail.ru

Ildar G. Shaikhiev, FGBOU VO «Kazan national research technological university», Kazan

Head of the Department of Environmental Engineering, Dr. Tech. Sciences, Associate Professor, Kazan National Research Technological University, Kazan

Svetlana V. Sverguzova, FGBOU VO «Belgorod state university of technology named after V.G. Shukhov, Belgorod

Head of the Department of Industrial Ecology, Dr. Tech. Sciences, Professor, Belgorod State Technological
University. V.G. Shukhov, Belgorod

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Published
2019-10-30
How to Cite
Miraftakhova, F. R., Thoa, N. T. K., Galimova, R. Z., Shaikhiev, I. G., & Sverguzova, S. V. (2019). The study of the adsorption of zinc ions by acid-modified acacia sawdust (Acacia auriculiformis). Sorbtsionnye I Khromatograficheskie Protsessy, 19(5), 588-595. https://doi.org/10.17308/sorpchrom.2019.19/1174
Issue
Vol 19 No 5 (2019): Sorbtsionnye i Khromatograficheskie Protsessy
Section
Статьи