Tantalum (oxy)nitrides nanotube arrays for the degradation of atrazine in vis-Fenton-like process
Tantalum (oxy)nitrides nanotube arrays for the degradation of atrazine in vis-Fenton-like process
复制标题
钽（氧）氮化物纳米管阵列用于类芬顿过程中莠去津的降解
DOI：
10.1016/j.jhazmat.2012.04.058
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发表时间：
2012-07-30
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
为了克服纳米颗粒应用的局限性，在Ta基片上合成了氮化钽纳米管阵列，并将其引入可见光-类Fenton体系中，以增强阿特拉津的降解。首先，在含有乙二醇水(v：v=2：1)和0.5wt%NH4F的温和电解液中阳极氧化生成平均直径为30 nm、长度约为1微米的钽纳米管，然后通过X射线衍射仪和X射线光电子能谱分析证实，在钽纳米管阵列的氮化过程中，N原子被取代为O原子，生成了TaN和Ta3N5。合成的氮化钽(氧)纳米管在600 nm的可见光范围内有很好的吸收。在可见光下，钽(氧)氮化物纳米管阵列对Fe3+的还原具有催化活性。氮化钽(氧)纳米管阵列显著加速了阿特拉津在Vis/Fe3+/H_2O_2体系中的降解和中间体的形成。这是由于Fe2+浓度较高，从而加快了Ta(Oxy)NdN纳米管分解H2O2的速度。此外，氮化钽(氧)纳米管在三次阿特拉津降解过程中表现出稳定的性能。氮化钽(氧)纳米管薄膜具有良好的性能和稳定性，且分离方便，是一种很有前途的类Vis-Fenton降解催化剂。(C)2012爱思唯尔B.V.保留所有权利。
In order to overcome the limitation of the application of nanoparticles, tantalum (oxy)nitrides nanotube arrays on a Ta foil were synthesized and introduced in vis (visible light)-Fenton-like system to enhance the degradation of atrazine. At first, the anodization of tantalum foil in a mild electrolyte solution containing ethylene glycol and water (v:v = 2:1) plus 0.5 wt.% NH4F produced tantala nanotubes with an average diameter of 30 nm and a length of approximately 1 mu m. Then the nitridation of tantala nanotube arrays resulted in the replacement of N atoms to O atoms to form tantalum (oxy)nitrides (TaON and Ta3N5), as testified by XRD and XPS analyses. The synthesized tantalum (oxy)nitrides nanotubes absorb well in the visible region up to 600 nm. Under visible light, tantalum (oxy)nitrides nanotube arrays were catalytically active for Fe3+ reduction. With tantalum (oxy)nitrides nanotube arrays, the degradation of atrazine and the formation of the intermediates in vis/Fe3+/H2O2 system were significantly accelerated. This was explained by the higher concentration of Fe2+ and thus the faster decomposition of H2O2 with tantalum (oxy)nitrides nanotubes. In addition, tantalum (oxy)nitrides nanotubes exhibited stable performance during atrazine degradation for three runs. The good performance and stability of the tantalum (oxy)nitrides nanotubes film with the convenient separation, suggest that this film is a promising catalyst for vis-Fenton-like degradation. (C) 2012 Elsevier B.V. All rights reserved.