Spectroscopy of condensed matter

Optimization of chemical composition and structure of the photocatalyst of ZnO–SnO$_2$–Fe$_2$O$_3$ system

D. A. Gavrilova^ab, M. A. Gavrilova^ab, L. L. Khomutinnikova^a, S. K. Evstropiev^abc, I. K. Meshkovskiĭ<sup>a

a</sup> ITMO University, 197101 St. Petersburg, Russia
^b State Technological Institute of St. Petersburg (Technical University), 190013 St. Petersburg, Russia
^c Vavilov State Optical Institute, 192171 St. Petersburg, Russia

Abstract: The work carried out studies to optimize the chemical composition and structure of the photocatalyst of the ZnO–SnO$_2$–Fe$_2$O$_3$ system for sensor and medical applications. Photocatalytic materials were synthesized by liquid polymer-salt method and their structure and chemical composition were studied by XRD and SEM analysis and optical and luminescence spectroscopy. Obtained composites are composed from hexagonal ZnO crystals, tetragonal SnO$_2$ crystals and ZnSn$_2$O$_4$ spinel. The band gap values of prepared materials are 3.17–3.24 eV. The kinetic dependencies of the adsorption of organic diazo dye Chicago Sky Blue from solutions on the composite surfaces are successfully described by kinetic equations of as pseudo-first so as pseudo-second orders. The kinetics of photocatalytic dye decomposition under UV and visible irradiations is successfully described by kinetic equation of pseudo-first order. It was found that Ag addition allows to remarkably enhance adsorptive and photocatalytic properties of SnO–SnO$_2$–Fe$_2$O$_3$ materials.

Keywords: nanocrystals, heterostructure, photocatalysis, adsorption.

Received: 10.02.2024
Revised: 10.03.2024
Accepted: 07.04.2024

DOI: 10.61011/OS.2024.04.58220.6016-24

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