화학공학소재연구정보센터
Journal of Hazardous Materials, Vol.195, 291-297, 2011
Tantalum (oxy)nitrides: Preparation, characterisation and enhancement of photo-Fenton-like degradation of atrazine under visible light
Tantalum (oxy)nitrides were prepared by the nitridation of Ta2O5 and were added to a photo-Fentonlike system to enhance Fe3+ reduction and atrazine degradation under visible light. The samples were characterized by XRD, XPS, DRS and BET analyses. XPS analysis showed that the nitrogen content of the tantalum (oxy)nitride samples increased noticeably with the nitridation temperature and nitridation time but slightly with the flow rate of NH3. XRD results showed Ta2O5 was first converted to TaON and then to Ta3N5 when the nitridation temperature increased. DRS analysis showed that the sample obtained at 800 degrees C displayed the strongest absorption of visible light. However, the ability of the tantalum (oxy)nitrides to reduce Fe3+ did not increase continuously with the nitrogen content. Sample 7 (700 degrees C, Q(NH3) = 0.3 L/min, 6 h) showed the highest level of photocatalytic activity for Fe3+ reduction. This is because the photocatalytic activity of TaON for Fe3+ reduction is higher than that of Ta3N5. And a slight synergetic effect was observed between TaON and Ta3N5. With the addition of sample 7, H2O2 decomposition and atrazine degradation were significantly accelerated in a photo-Fenton-like system under visible light. The regenerated tantalum (oxy)nitrides catalyst displayed considerably stable performance for atrazine degradation. (C) 2011 Elsevier B.V. All rights reserved.