Zr基金属-有机配合物UiO-66的改性及光催化性能

Modification and photocatalysis of UiO-66(Zr) type metal-organic frameworks(MOFs)

采用简单的改性后嫁接法,制备Ti改性的UiO-66型金属-有机配合物(UiO-66(Ti)),用于去除亚甲基蓝。使用X线光电子能谱仪(XPS)、X线衍射仪(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、紫外-可见吸收光谱仪(UV-Vis)和荧光光谱仪(PL)对材料的结构和性能进行表征。结果表明:引入的Ti和Zr元素之间形成了氧桥接的异质Zr-Ti簇,从而提高了UiO-66的光催化性能,但也降低了其结晶性能。这些样品对亚甲基蓝的去除是吸附和光降解共同作用的结果。在模拟太阳光照射下,UiO-66(1.25Ti)对亚甲基蓝的去除率最高,达到87.15%。

A new UiO-66 type metal-organic framework fabricated by titanium（UiO-66（Ti）） was successfully prepared via a facial modified post-grafting.The as-prepared samples were characterized by X-ray photoelectron spectroscopy（XPS）,X-ray diffractometer（XRD）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）,ultraviolet-visible adsorption spectroscopy（UV-Vis）,and photoluminescence spectroscopy（PL）.Results showed that the introduction of titanium enhanced the optical properties of UiO-66 via the formation of oxo-bridged hetero-Zr-Ti clusters with a sacrifice in crystallinity.The removal of methylene blue（MB） over these samples could be attributed to the dual function of the adsorption and photo-degradation.The highest MB removal efficiency of 87.15% was achieved over UiO-66（1.25Ti） under simulated sun-light irradiation.