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  • 1 Department of Advanced Ceramic Materials Engineering, Gangneung-Wonju National University, Gangneung, Gangwon-do, 210-702, Republic of Korea
  • | 2 Department of Civil Engineering, Gangneung-Wonju National University, Gangneung, Gangwon-do, 210-702, Republic of Korea
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Abstract

Carbothermally reduced and nitrided Ta2O5 powder at varying temperature (680–760 °C) in flowing NH3 facilitated both nitrogen doping and the formation of the traces of TaON and Ta3N5 to a greater degree than the simply NH3-heat-treated Ta2O5. 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 NH3 atmosphere. The carbothermal reduction followed by the NH3-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.

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