Abstract
Morphological features of iron-containing composites based on silicon, titanium, vanadium, and boron nitrides and prepared by self-propagating synthesis were examined by scanning electron microscopy, and the content of elements (B, Si, N, Ti, V, O, Fe, C, Al, Mg, Ca) on their surface was quantitatively estimated using an attachment for EDX microanalysis. The optical properties of the composites were studied, and the band gap values for the semiconductors incorporated in the ceramic matrix were determined. A comparative evaluation of the performance of the composites in hydrogen generation from solutions of organic substances (НСООН, Н2С2О4, malic acid, sucrose) under UV and visible irradiation was made. The efficiency of the photocatalytic generation of hydrogen under the action of visible light is shown to be associated both with the composition of the ceramic matrix containing semiconductor compounds and with the occurrence of the photo-Fenton process in the solution in the presence of hydrogen peroxide.
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