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<p>The composition and physicochemical properties of magnetically susceptible composites based on titanium dioxide and magnetite and obtained by heterocoagulation of oppositely charged hydrosols, were studied. The photocatalytic activity of systems with different ratios of oxides was investigated in the oxidation reactions of rhodamine B (RhB) and 4-acetaminophenol (APAP). Unlike the oxidation of APAP, the photodegradation of RhB in the presence of TiO<sub>2</sub>—Fe<sub>3</sub>O<sub>4</sub> hybrid particles is induced not only by UV radiation, but also by visible light, which is explained by the sensitization of the titanium dioxide surface. The introduction of negatively charged magnetite particles to titanium dioxide particles generally leads to a slight decrease in photocatalytic activity, although the system retains the ability to effectively degrade organic matter (&gt;95%). The formation of magnetic heteroaggregates imparts magnetic sensitivity to the samples and enables the regeneration of the photocatalyst under the influence of an external magnetic field.</p>

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Formation and photocatalytic properties of nanodispersed system TiO2—Fe3O4

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • K. S. Vavrinchuk,
  • I. S. Martakov,
  • V. I. Mikhaylov

摘要

The composition and physicochemical properties of magnetically susceptible composites based on titanium dioxide and magnetite and obtained by heterocoagulation of oppositely charged hydrosols, were studied. The photocatalytic activity of systems with different ratios of oxides was investigated in the oxidation reactions of rhodamine B (RhB) and 4-acetaminophenol (APAP). Unlike the oxidation of APAP, the photodegradation of RhB in the presence of TiO2—Fe3O4 hybrid particles is induced not only by UV radiation, but also by visible light, which is explained by the sensitization of the titanium dioxide surface. The introduction of negatively charged magnetite particles to titanium dioxide particles generally leads to a slight decrease in photocatalytic activity, although the system retains the ability to effectively degrade organic matter (>95%). The formation of magnetic heteroaggregates imparts magnetic sensitivity to the samples and enables the regeneration of the photocatalyst under the influence of an external magnetic field.