Catalytic Degradation of the Organic Dyes in the Presence of the Multiphase Titanium Dioxide and Hematite and Gold Nanocomposites

Olena Lavrynenko; Maksym Zahornyi; Nadiya Tyschenko; Oksana Kornienko; Andrey Ragulya

doi:10.4028/p-0XUQYc

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HomeNano Hybrids and CompositesNano Hybrids and Composites Vol. 48Catalytic Degradation of the Organic Dyes in the...

Catalytic Degradation of the Organic Dyes in the Presence of the Multiphase Titanium Dioxide and Hematite and Gold Nanocomposites

Abstract:

Chemical synthesis of nanocomposite particles based on titanium dioxide modified with iron and gold was carried out. It was shown that, depending on the mass content of the doping species, the phase transformation of titanium hydroxide at T = 700 °C proceeds with the formation of either anatase (2 wt.%) or anatase and rutile (8 wt.%). The doping species form a hematite phase and gold clusters on the metal-oxide surface. A weakly crystalline anatase obtained by the transformation of metatitanic acid (MTA), with a particle size of 8 nm and a sulfur content of 0.036%, was selected as the co-catalyst. The anatase co-catalyst exhibits photocatalytic activity in the destruction of organic dyes. Its introduction into the TiO₂&Fe₂O₃&Au nanocomposite suspension promotes the catalytic degradation of cationic and anionic dyes at temperatures ranging from 35 to 60 °C. It was observed that the degradation degree of the solutions after 150 min of catalytic process is the following: Methyl Orange (MO) – 72 %, Methylene Blue (MB) – 71.5 %, Rhodamine B (RhB) – 63.5 %, and Orange G (OG) – 47 %. The reaction rate constant depends on the composition of the dye, varying from 6.5·10^-4 min^-1 for OG to 2.56·10^-3 min^-1 for MB. The prospect of creating heterostructures based on TiO₂ modified with hematite and gold, and their further adaptation for photocatalytic hydrogen production, is considered.

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Periodical:

Nano Hybrids and Composites (Volume 48)

Pages:

29-40

DOI:

https://doi.org/10.4028/p-0XUQYc

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Online since:

November 2025

Authors:

Olena Lavrynenko*, Maksym Zahornyi, Nadiya Tyschenko, Oksana Kornienko, Andrey Ragulya

Keywords:

Anatase, Catalysis, Dye Decomposition, Gold, Hematite, Heterostructures, Multiphase Nanocomposite, Organic Dyes, Photocatalysis, Rutile, UV-VL Spectroscopy

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References

[1] S. Horikoshi, N. Serpone, Can the photocatalyst TiO2 be incorporated into a wastewater treatment method? Background and prospects, Catalysis Today 340 (2020) 334–346