Abstract: This study presents the synthesis of a TiO2-based composite material with transition metal (Ni, Cu) nanoparticles using microwave radiation. The obtained materials were characterised using X-ray powder diffraction, and the size of the nanoparticles was determined using the Scherrer equation. The photocatalytic activity of the synthesised composites was studied in reaction of CO2 reduction to CO and CH4 under the visible light with a wavelength of 400 nm. Microwave treatment of a mixture of TiO2 with transition metal salts (Ni, Cu) and graphite was founded to decrease a photocatalytic activity in CO2 reduction reaction, while a mechanical mixture of TiO2 and graphite, not subjected to microwave treatment, demonstrated increased catalytic activity compared to unmodified TiO2 Evonik P25. The decrease in catalytic activity of the case of microwave-treated samples is associated with an irreversible phase transition of the photoactive anatase phase into the catalytically inert rutile phase and formation of TiO2−x phases. This process is induced by overheating during microwave synthesis, where graphite (Cg) acts as an effective microwave absorber and a reducing agent for Ti4+ cations in TiO2. The obtained results are interesting for the development of efficient TiO2-based photocatalysts for CO2 reduction.

Cite: Kashansky V.S. , Sukhov A.V. , Zhurenok A.V. , Mishchenko D.D. , Soficheva O.S. , Kozlova E.A. , Sinyashin O.G. , Yakhvarov D.G.
Microwave-Assisted Synthesis of M/TiO2/C (M=Ni, Cu, Ni–Cu) Photocatalysts for CO2 Reduction: Structural Evolution and Photocatalytic Properties
Наносистемы: физика, химия, математика = Nanosystems: physics, chemistry, mathematics. 2025. V.16. N6. DOI: 10.17586/2220-8054-2025-16-6-0-6 publication_identifier_short.sciact_skif_identifier_type

Dates:

Submitted:	Oct 2, 2025
Accepted:	Oct 26, 2025

Identifiers:

publication_identifier.sciact_skif_identifier_type:

4221

Citing: Пока нет цитирований

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