Visible-light photocatalytic activity of carbothermally reduced/nitrided Ta2O5 to decompose rhodamine B in aqueous solution

Carbothermally reduced and nitrided Ta 2 O 5 powder at varying temperature (680–760 °C) in flowing NH 3 facilitated both nitrogen doping and the formation of the traces of TaON and Ta 3 N 5 to a greater degree than the simply NH 3 -heat-treated Ta 2 O 5 . It demonstrated an enhanced visible-light ab...

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Bibliographic Details
Published in:Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2012-12, Vol.107 (2), p.477-485
Main Authors: Kang, Hyun-Gyu, Shin, Hyunho, Kim, Gihong
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Physical Chemistry
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Summary:Carbothermally reduced and nitrided Ta 2 O 5 powder at varying temperature (680–760 °C) in flowing NH 3 facilitated both nitrogen doping and the formation of the traces of TaON and Ta 3 N 5 to a greater degree than the simply NH 3 -heat-treated Ta 2 O 5 . It demonstrated an enhanced visible-light absorption, an enhanced surface adsorption of rhodamine B molecules in the dark, and subsequently an improved visible-light photocatalytic activity to decompose rhodamine B in aqueous solution (via mainly surface photosensitization), as compared to the simply nitrided counterpart in NH 3 atmosphere. The carbothermal reduction followed by the NH 3 -treatment (nitridation) is proven to be an efficient way to improve the degree of nitridation at a given temperature. The product of such process can be an efficient visible light photocatalyst.
ISSN:1878-5190
1878-5204
DOI:10.1007/s11144-012-0479-4