Effect of reaction time on the phase transformation and photocatalytic activity under solar irradiation of tungsten oxide nanocuboids prepared via facile hydrothermal method

Autor:	Ngoc Linh Pham, Duc Tho Do, Cong Tu Nguyen, T. Lan Anh Luu, Thi Thuy Nhi Nguyen
Rok vydání:	2021
Předmět:	Materials science Tungsten oxide Hydrothermal circulation chemistry.chemical_compound Transformation (genetics) chemistry Chemical engineering Phase (matter) Photocatalysis General Materials Science Irradiation Hydrogen peroxide Instrumentation Monoclinic crystal system
Zdroj:	Phase Transitions. 94:651-666
ISSN:	1029-0338 0141-1594
Popis:	Monoclinic WO3 nanocuboids were synthesized via a one-pot hydrothermal method in a highly acidic environment at 180°C for different reaction times (12, 24, and 48 h). The phase transformation from orthorhombic to monoclinic and then to oxygen-deficient Magnéli phase and an increase in optical bandgap from 2.43 to 2.70 eV were observed when the reaction time increased from 12 to 24 h and then to 48 h. All samples showed photocatalytic activity towards the degradation of methylene blue (MB) under solar light irradiation, which was strongly enhanced in the presence of hydrogen peroxide (H2O2). Sample prepared for 24 h showed the highest MB removal efficiency of 31.4% in the absence of H2O2, which was enhanced to 76% and 92% when adding 0.2 and 0.5 mL of H2O2, respectively. These results give insights into the phase transformation and photocatalytic mechanism of WO3 nanocuboids prepared via the hydrothermal method.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c2b37232d16a865c14484d0bb2097ae4 https://doi.org/10.1080/01411594.2021.1954646 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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