Abstract
The photocatalytic activity of iron-containing metal-ceramic composites based on silicon nitride modified with semiconductor tantalum oxo compounds in the process of oxidative degradation of diclofenac (DCF) was investigated. The composites were synthesized by autowave combustion in nitrogen atmosphere of ferrosilicoaluminum with different additives (5, 10, 15 wt%) of metallic tantalum. The phase composition was determined by X-ray diffraction and IR-spectroscopy, and the content of elements in local surface areas was quantitatively evaluated by X-ray spectral microanalysis. The activity of composites under conditions of heterogeneous photocatalysis, combined heterogeneous photocatalysis with photo-Fenton and "Peroxone" processes under UV irradiation, catalytic ozonation under UV and visible light irradiation was studied. The combination of heterogeneous photocatalysis and "Peroxone" process is the most effective. The Langmuir-Hinshelwood scheme was applied to establish the mechanism of DCF photocatalytic degradation process.
Published Version
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