Tantalum (oxy)nitrides: Preparation, characterisation and enhancement of photo-Fenton-like degradation of atrazine under visible light
Tantalum (oxy)nitrides: Preparation, characterisation and enhancement of photo-Fenton-like degradation of atrazine under visible light
复制标题
钽（氧）氮化物：可见光下莠去津的光芬顿降解的制备、表征和增强
DOI：
10.1016/j.jhazmat.2011.08.042
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发表时间：
2011-11-15
影响因子：
13.6
通讯作者：
Su, Yaling
中科院分区：
文献类型：
--
作者：
Du, Yingxun;Zhao, Lu;Su, Yaling
以Ta 2 O 5为原料，通过氮化反应制备了氮氧化钽，并将其加入到类Fenton体系中，研究了其在可见光下对Fe ~（3+）还原和莠去津降解的影响.采用XRD、XPS、DRS和BET等手段对样品进行了表征。XPS分析表明，氮（氧）氮化钽样品的氮含量显着增加的氮化温度和氮化时间，但略有增加，与NH3的流量。XRD结果表明，随着氮化温度的升高，Ta 2 O 5首先转变为TaON，然后转变为Ta 3 N5。DRS分析表明，在800 ℃下获得的样品显示出最强的可见光吸收。然而，钽（氧）氮化物还原Fe 3+的能力并不随氮含量的增加而连续增加。样品7（700 ℃，Q（NH3）= 0.3 L/min，6 h）显示出最高水平的用于Fe 3+还原的光催化活性。这是因为TaON对Fe 3+还原的光催化活性高于Ta 3 N5。TaON和Ta 3 N5之间存在轻微的协同效应。在可见光下，样品7的加入显著促进了H2 O2分解和阿特拉津降解。再生的氮氧化钽催化剂对阿特拉津的降解表现出相当稳定的性能。(C)2011 Elsevier B. V.保留所有权利。
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.