Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 2, Pages 1857-1868Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.09.269
Keywords
Carbon-coated; Mesocrystal; Tantalum oxyfluoride(TaO2F); Tantalum pentoxide(Ta(2)O5); Oxygen vacancy; Photocatalysis
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Funding
- National Natural Science Foundation of China (NSFC) [51602075, 51802176]
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Carbon-coated tantalum-based oxides photocatalysts were synthesized through annealing in argon, demonstrating excellent photocatalytic activity in degrading methylene blue under visible light, indicating their promising potential for wide-ranging photocatalytic applications.
Pure and carbon-coated tantalum-based oxides photocatalysts were synthesized via the mesocrystalline precursor transformation method by annealing pure and polydopamine-coated (NH4)2Ta2O3F6 mesocrystals in Ar. The oxygen-poor atmosphere thermal annealing process assisted the formation of nonstoichiometric TaO2F mesocrystals with more F and Ta2O5 nanorods with oxygen vacancies and the associated lower valence state Ta ions (Ta4+). Furthermore, the carbon coating, decomposed from coated polydopamine, helped to control their particle size within 100 nm by isolating the connection of (NH4)2Ta2O3F6 subunits. Hence, as-synthesized products, particularly carbon-coated Ta2O5 nanosheets, owning large surface area (67.6 m2 g-1), fine particle size (<100 nm), excellent electronic conductivity, decreased bandgap energy, enhanced and extended absorption in the visible range, exhibited preferable photocatalytic activity in the photodegradation of methylene blue, reaching a 76.54 % and 41.71 % removal under ultraviolet and visible light illumination, suggesting a promising candidate for wide-range responsive photocatalytic applications.
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