TY - JOUR

T1 - Enhanced Photocatalytic Activity and Stability of Bi2 WO6 – TiO2-N Nanocomposites in the Oxidation of Volatile Pollutants

AU - Kovalevskiy, Nikita

AU - Cherepanova, Svetlana

AU - Gerasimov, Evgeny

AU - Lyulyukin, Mikhail

AU - Solovyeva, Maria

AU - Prosvirin, Igor

AU - Kozlov, Denis

AU - Selishchev, Dmitry

N1 - Funding Information: Funding: This study was funded by the Ministry of Science and High Education of the Russian Federation according to the project AAAA-A21-121011390006-0 at the Boreskov Institute of Catalysis. D.S. and N.K. thank the Council on Grants of the President of the Russian Federation (grant number 075-15-2021-457 (MK-5634.2021.1.3)) and the Russian Foundation for Basic Research (grant number 20-33-90309) for financial support. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/2/1

Y1 - 2022/2/1

N2 - The development of active and stable photocatalysts for the degradation of volatile organic compounds under visible light is important for efficient light utilization and environmental protection. Titanium dioxide doped with nitrogen is known to have a high activity but it exhibits a relatively low stability due to a gradual degradation of nitrogen species under highly powerful radiation. In this paper, we show that the combination of N-doped TiO2 with bismuth tungstate prevents its degradation during the photocatalytic process and results in a very stable composite photocatalyst. The synthesis of Bi2 WO6 –TiO2-N composites is preformed through the hydrothermal treatment of an aqueous medium containing nanocrystalline N-doped TiO2, as well as bismuth (III) nitrate and sodium tungstate followed by drying in air. The effect of the molar ratio between the components on their characteristics and photocatalytic activity is discussed. In addition to an enhanced stability, the composite photocatalysts with a low content of Bi2 WO6 also exhibit an enhanced activity that is substantially higher than the activity of individual TiO2-N and Bi2 WO6 materials. Thus, the Bi2 WO6 – TiO2-N composite has the potential as an active and stable photocatalyst for efficient purification of air.

AB - The development of active and stable photocatalysts for the degradation of volatile organic compounds under visible light is important for efficient light utilization and environmental protection. Titanium dioxide doped with nitrogen is known to have a high activity but it exhibits a relatively low stability due to a gradual degradation of nitrogen species under highly powerful radiation. In this paper, we show that the combination of N-doped TiO2 with bismuth tungstate prevents its degradation during the photocatalytic process and results in a very stable composite photocatalyst. The synthesis of Bi2 WO6 –TiO2-N composites is preformed through the hydrothermal treatment of an aqueous medium containing nanocrystalline N-doped TiO2, as well as bismuth (III) nitrate and sodium tungstate followed by drying in air. The effect of the molar ratio between the components on their characteristics and photocatalytic activity is discussed. In addition to an enhanced stability, the composite photocatalysts with a low content of Bi2 WO6 also exhibit an enhanced activity that is substantially higher than the activity of individual TiO2-N and Bi2 WO6 materials. Thus, the Bi2 WO6 – TiO2-N composite has the potential as an active and stable photocatalyst for efficient purification of air.

KW - Bi WO

KW - Composite photocatalyst

KW - N-doped TiO

KW - Photocatalysis

KW - Stability test

KW - UV

KW - Visible light

KW - VOC oxidation

UR - http://www.scopus.com/inward/record.url?scp=85123104630&partnerID=8YFLogxK

U2 - 10.3390/nano12030359

DO - 10.3390/nano12030359

M3 - Article

C2 - 35159704

AN - SCOPUS:85123104630

VL - 12

JO - Nanomaterials

JF - Nanomaterials

SN - 2079-4991

IS - 3

M1 - 359

ER -