Journal
REACTION KINETICS MECHANISMS AND CATALYSIS
Volume 106, Issue 1, Pages 67-81Publisher
SPRINGER
DOI: 10.1007/s11144-011-0404-2
Keywords
Ta2O5; Nitrogen doping; TaON; Ta3N5; Photocatalytic activity
Categories
Funding
- National Research Foundation of Korea
- Ministry of Education, Science and Technology [2010-0004150]
- National Research Foundation of Korea [2010-0004150] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Ta2O5 powder was heat treated in flowing NH3 at varying temperature for 2 h. When heat treated at 680-720 A degrees C, nitrogen was doped to Ta2O5, but showed only a slight improvement of photocatalysis of rhodamine B dye in solution under visible light irradiation. From the heat treatment temperature of 740 A degrees C, seeds of TaON and Ta3N5 formed newly and grew with the temperature. The optical absorption edge at 410-510 nm by TaON and absorption shoulder at 535 nm by Ta3N5 were observed. These specimens with N-doped Ta2O5, TaON, and Ta3N5 demonstrated notably improved photocatalytic performance, and the photocatalysis was facilitated by surface photosensitization.
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