TY - JOUR

T1 - Selecting a synthetic route of copper-modified g-C3N4/TiO2 photocatalysts for efficient CO2 reduction

AU - Kurenkova, Anna Yu

AU - Saraev, Andrey A.

AU - Alekseev, Roman F.

AU - Zhurenok, Angelina V.

AU - Mishchenko, Denis D.

AU - Gerasimov, Evgeny Yu

AU - Kozlova, Ekaterina A.

N1 - This work was supported by the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-15-2022-263).

PY - 2025/3

Y1 - 2025/3

N2 - CO2 utilization is an urgent task for sustainable development, and one of the promising approaches for CO2 conversion is photocatalysis. In this work, photocatalysts based on g-C3N4/TiO2 heterostructures and modified with copper were synthesized and studied in photocatalytic CO2 reduction under light irradiation (400 nm and simulated solar light). The photocatalysts were synthesized by a simple deposition method and characterized by a set of physicochemical methods. In-situ diffuse reflectance infrared Fourier transform spectroscopy was used to study processes over photocatalyst surface under light irradiation. The influence of the deposition order of components (CuOx and g-C3N4) to TiO2 on the structure and photocatalytic properties of samples was established. The highest activity was demonstrated by the photocatalyst prepared by the deposition of g-C3N4 on copper-modified TiO2. This photocatalyst g-C3N4/CuOx/TiO2 showed the highest total rate of electron consumed during CO2 reduction of 102 μmol h−1 g−1 under LED (λmax = 400 nm) and 8.1 μmol h−1 g−1 under simulated solar light irradiation (AM1.5G) which are 14 and 16 times higher than that TiO2 Evonik P25, respectively. The synergistic effect of TiO2 modification with g-C3N4 and CuOx for photocatalytic CO2 reduction in the solid–gas mode is demonstrated for the first time.

AB - CO2 utilization is an urgent task for sustainable development, and one of the promising approaches for CO2 conversion is photocatalysis. In this work, photocatalysts based on g-C3N4/TiO2 heterostructures and modified with copper were synthesized and studied in photocatalytic CO2 reduction under light irradiation (400 nm and simulated solar light). The photocatalysts were synthesized by a simple deposition method and characterized by a set of physicochemical methods. In-situ diffuse reflectance infrared Fourier transform spectroscopy was used to study processes over photocatalyst surface under light irradiation. The influence of the deposition order of components (CuOx and g-C3N4) to TiO2 on the structure and photocatalytic properties of samples was established. The highest activity was demonstrated by the photocatalyst prepared by the deposition of g-C3N4 on copper-modified TiO2. This photocatalyst g-C3N4/CuOx/TiO2 showed the highest total rate of electron consumed during CO2 reduction of 102 μmol h−1 g−1 under LED (λmax = 400 nm) and 8.1 μmol h−1 g−1 under simulated solar light irradiation (AM1.5G) which are 14 and 16 times higher than that TiO2 Evonik P25, respectively. The synergistic effect of TiO2 modification with g-C3N4 and CuOx for photocatalytic CO2 reduction in the solid–gas mode is demonstrated for the first time.

KW - CO2 reduction

KW - Copper cocatalyst

KW - Photocatalysis

KW - Photocatalyst

KW - TiO2

KW - g-C3N4

UR - https://www.mendeley.com/catalogue/7a708b30-17c8-345d-8f4b-836911fb2116/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85214336295&origin=inward&txGid=58442147857bc2bbfa7db5597445e0be

U2 - 10.1016/j.inoche.2024.113863

DO - 10.1016/j.inoche.2024.113863

M3 - Article

VL - 173

JO - Inorganic Chemistry Communication

JF - Inorganic Chemistry Communication

SN - 1387-7003

M1 - 113863

ER -