Structure and photocatalytic activity of composites of semiconducting nanoparticles in polymethylmethacrylate

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Abstract

We fabricated and studied composites made of titania (TiO2), zinc oxide (ZnO) or graphitic carbon nitride (g-C3N4) nanoparticles (20–100 nm) in polymethylmethacrylate (PMMA). Nanodispersed powders of these semiconductors were mixed with mechanically grinded PMMA at a weight ratio ranging from 1 : 5 to 1 : 20. The mixture was dissolved in acetone and deposited on to the surface of water. Upon solidification and drying in air porous discs as thick as 50–200 μm were formed. They were found to have a mechanical durability at the semiconductor to PMMA ratio above 1 : 20. Scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray difractomenry of the samples demonstrated that semiconducting nanoparticles are quasiuniformly distributed in the polymer matrix. Their crystal structure, the particle size and the composition do not change in comparison to those before synthesis of the composites. Photocatalytic activity of the synthesized composites estimated by decolarization of water solution of the test dye (methylene blue) under UV irradiation was found to be reduced in the sequence TiO2, g-C3N4, ZnO.

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About the authors

S. E. Maksimov

Belarusian State University of Informatics and Radioelectronics

Author for correspondence.
Email: maksimov914@gmail.com
Belarus, P. Browka 6, Minsk, 220013

K. O. Yanushkevich

Belarusian State University of Informatics and Radioelectronics

Email: maksimov914@gmail.com
Belarus, P. Browka 6, Minsk, 220013

D. I. Tishkevich

SSPA Scientific-Practical Materials Research Centre of NAS of Belarus

Email: maksimov914@gmail.com
Belarus, P. Browka 19, Minsk, 220072

V. E. Borisenko

Belarusian State University of Informatics and Radioelectronics

Email: maksimov914@gmail.com
Belarus, P. Browka 6, Minsk, 220013

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Supplementary files

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2. Fig. 1. The appearance of an experimental sample formed from PMMA powder without semiconductor particles.

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3. Fig. 2. Surface view of experimental samples synthesized from pure PMMA and from a mixture of ZnO : PMMA.

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4. Fig. 3. Distribution of atoms from semiconductors added to the PMMA matrix.

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5. Fig. 4. Diffractograms of the initial PMMA and TiO2 : PMMA, ZnO : PMMA, g-C3N4 : PMMA composites synthesized at a component weight ratio of 1:20.

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6. Fig. 5. Relative change in the concentration of the test dye – methylene blue in its aqueous solution exposed to UV irradiation in the presence of composite catalysts TiO2 : PMMA, ZnO : PMMA, g-C3N4 : PMMA synthesized at a component weight ratio of 1: 20.

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