Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, P. R. China.
Nanoscale. 2014 Jun 7;6(11):5612-5. doi: 10.1039/c4nr00364k. Epub 2014 Apr 17.
This work presents a rapid nanotube fabrication method for a series of silver compounds AgnX, such as Ag2S, AgCl, Ag3PO4, and Ag2C2O4, from pregrown Ag2CO3 nanorod templates. The anion exchange process involved takes place in non-aqueous solutions just at room temperature and completes within 10 minutes. An acid-etching anion exchange reaction mechanism has been proved underneath the transformation process from Ag2CO3 nanorods to AgnX nanotubes by the observation of an intermediate yolk-shell nanostructure. It has been found that the final structure of the products can be conveniently controlled by simply varying the concentration of HnX acids, and the organic solvents employed play a vital role in the formation of the nanotubes by effectively controlling the diffusion rates of different species of reacting ions. As a demonstration, the as-prepared AgCl and Ag3PO4 nanotubes exhibit enhanced photocatalytic activity and favorable recyclability for the photodegradation of rhodamine B (RhB) under visible-light irradiation.
本文提出了一种快速制备银化合物纳米管的方法，如 Ag2S、AgCl、Ag3PO4 和 Ag2C2O4，其模板为预先生长的 Ag2CO3 纳米棒。涉及的阴离子交换过程在室温下的非水溶剂中进行，整个过程在 10 分钟内完成。通过观察中间蛋黄壳纳米结构，证明了从 Ag2CO3 纳米棒到 AgnX 纳米管的转化过程中存在酸刻蚀阴离子交换反应机理。研究发现，通过简单改变 HnX 酸的浓度，很容易控制产物的最终结构，而所使用的有机溶剂通过有效控制不同反应离子的扩散速率，在纳米管的形成中起着至关重要的作用。作为一个实例，所制备的 AgCl 和 Ag3PO4 纳米管在可见光照射下对罗丹明 B（RhB）的光降解表现出增强的光催化活性和良好的可循环性。
