Formation of WO3 nanotube-based bundles directed by NaHSO4 and its application in water treatment
Formation of WO3 nanotube-based bundles directed by NaHSO4 and its application in water treatment
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NaHSO4引导WO3纳米管束的形成及其在水处理中的应用
DOI：
10.1039/c2ta00382a
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Wang, Xin
中科院分区：
文献类型：
--
作者：
Li, Jin;Liu, Xiaoheng;Wang, Xin
自组装可以为新型材料的设计提供非常强大的工具，并且已经发现许多不同的模板来指导微结构的形成。在这篇文章中，我们报告了一个简单的方法，用于自组装的三维（3D）WO 3纳米管束。结果表明，NaHSO 4不仅可以作为反应物，而且更重要的是，它在自组装过程中发挥了多种关键作用，而NH 4 HSO 4和KHSO 4则完全没有这些功能。首先，NaHSO 4与Na 2 WO 4在180 °C水热反应生成WO 3有序层状结构，然后，钠离子（Na+）插入层中，通过Na+离子与H+离子在WO 3片表面的静电排斥力，使WO 3外层连续卷曲。在此，Na+离子可以显著促进WO 3单晶片的形成，这是自组装的前体，SO 42-离子可以桥接WO 3片和纳米管。此外，还发现去除模板后的WO 3纳米管束仍保持其原有的聚集状态，且在较长的超声处理时间下，纳米管束会逐渐解体。此外，还研究了WO 3纳米管束在废水处理中的应用。
Self-assembly can offer a very powerful tool for the design of novel materials and many different templates have been found to direct the formation of microstructures. In this article, we report a simple method for the self-assembly of three-dimensional (3D) WO3 nanotube bundles. It is demonstrated that not only can NaHSO4 act as a reactant, but also, more importantly, it played multiple key roles in the self-assembly processes, while NH4HSO4 and KHSO4 have none of these functions at all. As suggested, at first, WO3 ordered and layered structures can be generated by the hydrothermal reaction of NaHSO4 with Na2WO4 at 180 °C, and then sodium ions (Na+) inserted into the layer cause a continual curl of the WO3 outer-slice by the repel force of static electricity between Na+ ions and H+ ions on the surface of the WO3 slice. Herein, Na+ ions can dramatically promote the formation of WO3 single crystal slices, which are precursors of the self-assembly, and SO42− ions can bridge the WO3 slices as well as the nanotubes. In addition, it is found that the WO3 nanotube bundles still keep their original aggregation after template removal, and the bundle can be disassembled gradually under a long treatment time of aqueous ultrasonication. Furthermore, the application in wastewater treatment of WO3 nanotube bundles has been investigated.