Nanjing Institute of Geography and Limnology, State Key Laboratory of Lake Science and Environment, Chinese Academy of Sciences, Nanjing 210008, China.
J Hazard Mater. 2011 Nov 15;195:291-7. doi: 10.1016/j.jhazmat.2011.08.042. Epub 2011 Aug 22.
Tantalum (oxy)nitrides were prepared by the nitridation of Ta(2)O(5) and were added to a photo-Fenton-like system to enhance Fe(3+) 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 NH(3). XRD results showed Ta(2)O(5) was first converted to TaON and then to Ta(3)N(5) when the nitridation temperature increased. DRS analysis showed that the sample obtained at 800°C displayed the strongest absorption of visible light. However, the ability of the tantalum (oxy)nitrides to reduce Fe(3+) did not increase continuously with the nitrogen content. Sample 7 (700°C, [Formula: see text] , 6h) showed the highest level of photocatalytic activity for Fe(3+) reduction. This is because the photocatalytic activity of TaON for Fe(3+) reduction is higher than that of Ta(3)N(5). And a slight synergetic effect was observed between TaON and Ta(3)N(5). With the addition of sample 7, H(2)O(2) 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.
氮化钽（氧）被制备出来，并被添加到类光芬顿体系中，以在可见光下增强 Fe(3+)的还原和莠去津的降解。通过 XRD、XPS、DRS 和 BET 分析对样品进行了表征。XPS 分析表明，氮化钽（氧）样品的氮含量随氮化温度和氮化时间的增加而显著增加，但随氨气流量的增加而略有增加。XRD 结果表明，随着氮化温度的升高，Ta(2)O(5)首先转化为 TaON，然后转化为 Ta(3)N(5)。DRS 分析表明，在 800°C 下获得的样品对可见光的吸收最强。然而，氮化钽（氧）还原 Fe(3+)的能力并没有随着氮含量的增加而持续增加。样品 7（700°C，[Formula: see text]，6h）显示出最高的 Fe(3+)还原光催化活性。这是因为 TaON 对 Fe(3+)还原的光催化活性高于 Ta(3)N(5)。并且在 TaON 和 Ta(3)N(5)之间观察到轻微的协同效应。在可见光下的类光芬顿体系中，添加样品 7 后，H(2)O(2)的分解和莠去津的降解明显加快。再生的氮化钽（氧）催化剂在降解莠去津方面表现出相当稳定的性能。
