Structure, Adsorptive and Photocatalytic Properties of Porous ZnO Nanopowders Modified by Oxide Compounds of Manganese

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Abstract

Porous nanocomposites based on oxide compounds of zinc and manganese are synthesized and their structure, morphology, spectral and photocatalytic properties are studied. It is shown that the resulting porous oxide composites have photocatalytic properties and consist of ZnO, Mn3O4 and ZnMn2O4 nanocrystals with a size of 20–40 nm. The introduction of Mn2+ ions into the crystal lattice of ZnO causes a increase in the size of the unit cell of crystals. The band gap of the composites is 3.26 eV. The kinetics of photocatalytic decomposition in a Chicago Blue Sky dye solution is described by a pseudo-first order equation. In the presence of porous nanocomposites, the processes of oxidation of organic compounds proceed both on the surface of photocatalysts and in solution. The synthesized nanocomposites are promising for use in photocatalytic systems for water purification from organic contaminants.

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About the authors

M. A. Gavrilova

Saint Petersburg State Institute of Technology (Technical University)

Author for correspondence.
Email: amonrud@yandex.ru
Russian Federation, Saint Petersburg

D. A. Gavrilova

Saint Petersburg State Institute of Technology (Technical University)

Email: amonrud@yandex.ru
Russian Federation, Saint Petersburg

S. K. Evstropiev

Saint Petersburg State Institute of Technology (Technical University); ITMO University; Vavilov State Optical Institute

Email: amonrud@yandex.ru
Russian Federation, Saint Petersburg; Saint Petersburg; Saint Petersburg

N. V. Nikonorov

ITMO University

Email: amonrud@yandex.ru
Russian Federation, Saint Petersburg

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2. Fig. 1. X-ray radiographs of Zn (a) [9], ZnMn9 (b), ZnMn17 (c) and ZnMn50 (d) powders.

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3. Fig. 2. Electron microscopic images of synthesized powders of ZnMn9 (a, d), ZnMn17 (b, e) and ZnMn50 (c, f).

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4. Fig. 3. Diffuse reflectance spectra (a, b, c) and the dependences calculated from them (FKM h)2 = f(h) for Zn (a, d), ZnMn9 (b, e) and ZnMn17 (c, f) samples.

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5. Fig. 4. Effect of blue light irradiation on the absorption spectra of Chicago Sky Blue dye solutions without photocatalyst addition (a), with ZnMn9 composite addition (b).

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6. Fig. 5. a) Kinetic dependences of dye photodegradation in solution without photocatalyst additives (1), as well as in solutions containing ZnMn9 (2), ZnMn17 (3) and ZnMn50 (4) composites; b) Kinetic dependences of dye adsorption on the surface of ZnMn9 (1); ZnMn17 (2); ZnMn50 (3) composites.

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