氨基修饰的MIL-88b(Fe)的制备及其光催化性能

Preparation and photocatalytic performance ofamino-functionalized MIL-88b(Fe)

为提高MIL-88b(Fe)光催化性能,采用氨基修饰有机配体,制备了氨基官能化的MIL-88b(Fe)(NH2-MIL-88b(Fe)),通过X射线衍射、扫描电子显微镜、漫反射光谱等对其进行了系统表征。结果表明,氨基官能化后,催化剂的禁带宽度明显缩小,具有更好的可见光吸收能力,同时光生电子-空穴对的分离效率也得到了提高。以亚甲基蓝溶液为目标污染物进行光催化性能测试,与MIL-88b(Fe)相比,NH2-MIL-88b(Fe)光催化降解亚甲基蓝溶液的效率明显提高,反应180min后亚甲基蓝溶液的脱色率达97%。重复利用实验结果表明NH2-MIL-88b(Fe)具有较好的稳定性。

In order to improve the photocatalytic performance of MIL-88b(Fe), amino-functionalized MIL-88b(Fe) (NH 2-MIL-88b(Fe)) was prepared using amino-modified organic ligands. They were characterized systematically by X ray diffraction, scanning electron microscopy and diffuse reflectance spectroscopy. The results showed that the amino functionalization obviously reduced the band gap of the catalyst, which enhanced the visible-light absorption capacity and the separation efficiency of photogenerated electron-hole pairs. As the target pollutant, methylene blue (MB) was used to investigate the photocatalytic degradation performance. The photocatalytic degradation efficiency of MB by NH 2-MIL-88b(Fe) was significantly higher compared with MIL-88b(Fe). After 180 min of reaction, the decolorization rate of MB reached 97%. Cycling experimental results showed that NH 2-MIL-88b(Fe) possessed good stability.