Magnesium-zinc ferrites as magnetic adsorbents for Cr(VI) and Ni(II) ions removal: Cation distribution and antistructure modeling

Tetiana Tatarchuk; Mariana Myslin; Ivanna Lapchuk; Alexander Shyichuk; Arun Prasad Murthy; Renata Gargula; Piotr Kurzydło; Bogdan F Bogacz; Antoni T Pędziwiatr

doi:10.1016/j.chemosphere.2020.129414

Magnesium-zinc ferrites as magnetic adsorbents for Cr(VI) and Ni(II) ions removal: Cation distribution and antistructure modeling

Chemosphere. 2021 May:270:129414. doi: 10.1016/j.chemosphere.2020.129414. Epub 2020 Dec 26.

Authors

Tetiana Tatarchuk¹, Mariana Myslin², Ivanna Lapchuk³, Alexander Shyichuk⁴, Arun Prasad Murthy⁵, Renata Gargula⁶, Piotr Kurzydło⁶, Bogdan F Bogacz⁶, Antoni T Pędziwiatr⁷

Affiliations

¹ Educational and Scientific Center of Material Science and Nanotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, 76018, Ukraine. Electronic address: tatarchuk.tetyana@gmail.com.
² Department of Chemistry, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Street, 76018, Ivano-Frankivsk, Ukraine. Electronic address: marjanysik@gmail.com.
³ Department of Chemistry, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Street, 76018, Ivano-Frankivsk, Ukraine.
⁴ Department of Chemistry, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Street, 76018, Ivano-Frankivsk, Ukraine; Faculty of Chemical Technology and Engineering, UTP University of Science and Technology, 3, Seminaryjna Str., 85-326, Bydgoszcz, Poland. Electronic address: szyjczuk@utp.edu.pl.
⁵ Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore, Tamilnadu, 632 014, India. Electronic address: arunprasadiitm@gmail.com.
⁶ M. Smoluchowski Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348, Kraków, Poland.
⁷ M. Smoluchowski Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348, Kraków, Poland. Electronic address: antoni.pedziwiatr@uj.edu.pl.

PMID: 33418216
DOI: 10.1016/j.chemosphere.2020.129414

Abstract

The magnesium-zinc ferrites Mg_1-xZn_xFe₂O₄ (x = 0…1) were studied as magnetic sorbents for environmental applications. Low-temperature Mössbauer spectroscopy was used to determine the distribution of magnesium and ferric ions in the spinel crystal lattice. The influence of Zn content on magnetic parameters was investigated on the basis of VSM data. As the molar ratio of zinc to magnesium increases from 0 to 1, the pH_PZC value decreases from 10.5 to 8.9. Langmuir and Freundlich models were used to check whether single-layer or multi-layer adsorption occurs. The adsorption of Cr(VI) and Ni(II) ions is well fitted by the Langmuir equation. To check the physical or chemical nature of the sorption process, the Dubinin-Radushkevich equation was used. It was found that the processes of adsorption of Cr(VI) and Ni(II) ions are of a chemical nature. The best Cr(VI) ion adsorption capacity was found for the Mg_0·2Zn_0·8Fe₂O₄ sample (q_e = 30.49 mg/g). The percentage of heavy metal removal by the mixed ferrite samples increases with increasing zinc content. The most effective sorbent for Ni(II) removal is the Mg_0·4Zn_0·6Fe₂O₄ sample (93.2%). Modeling the antistructure provides deeper insight into the mechanism of heavy metal adsorption. The obtained magnesium-zinc ferrites are promising magnetic adsorbents for removing chromate and nickel ions from the environment.

Keywords: Active centers; Adsorption; Antistructure modeling; Ferrite.

MeSH terms

Adsorption
Cations
Chromium
Ferric Compounds
Hydrogen-Ion Concentration
Ions
Kinetics
Magnesium
Magnetic Phenomena
Water Pollutants, Chemical* / analysis
Zinc* / analysis

Substances

Cations
Ferric Compounds
Ions
Water Pollutants, Chemical
Chromium
ferrite
chromium hexavalent ion
Magnesium
Zinc