PVA-CoFe2O4-BIOCHAR COMPOSITES: STRUCTURE AND PROPERTIES

Liliya A. Frolova; Dmytro Yu.  Saltykov; Oleksandr I.  Kushnerov; Kostyantin V.  Olkhov; Maksim O.  Nikitin; Dmytro O.  Rodin

doi:10.15421/jchemtech.v33i4.336256

Authors

Liliya A. Frolova Ukrainian State University of Chemical Technology, Ukraine http://orcid.org/0000-0001-7970-2264
Dmytro Yu. Saltykov Oles Honchar Dnipro National University, Ukraine
Oleksandr I. Kushnerov Oles Honchar Dnipro National University, Ukraine https://orcid.org/0000-0002-9683-2041
Kostyantin V. Olkhov Ukrainian State University of Science and Technologies, Ukraine
Maksim O. Nikitin Ukrainian State University of Science and Technologies, Ukraine
Dmytro O. Rodin Ukrainian State University of Science and Technologies, Ukraine https://orcid.org/0009-0004-6902-5473

DOI:

https://doi.org/10.15421/jchemtech.v33i4.336256

Keywords:

magnetic properties, spinel, X-ray phase analysis

Abstract

PVA-CoFe₂O₄-biochar composites were synthesized by a two-stage combined method. The resulting composites were characterized by X-ray diffraction, scanning electron microscopy, UV-visible absorption spectroscopy, vibrational magnetometry, and vector microwave analysis. The results of electron microscopy show that biochar has a block structure with large pores, so this structure can be used in the creation of composites. The magnetic properties depend on the content of cobalt ferrite in the composite. The results of the study of photocatalytic properties showed that the rate of destruction of methylene blue (MB) is 50–98% after 60 min of UV radiation. It was established that the reaction of photocatalytic decomposition of MB obeys pseudo-first-order kinetics. Among these catalysts, biochar showed the highest rate constant of 0.085 min−1, PVA/CoFe₂O₄-biochar composites – 0.05 min⁻¹.

When studying the absorption of electromagnetic radiation in the radar range from 8 GHz to 12 GHz by PVA/CoFe₂O₄-biochar composites, it was found that with an increase in the ratio of CoFe₂O₄-bichar components to 0.67 wt. parts CoFe₂O₄, the absorption losses of the composite reach –14.15 dB/mm at a frequency of 8 GHz and –12.37 dB at a frequency of 12 GHz.

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