磷钨酸和邻菲啰啉杂多化合物的合成及光催化性能

Synthesis and Photocatalytic Performance of Heteropoly Compound Based on Phosphotungstic Acid and Phenanthroline

通过磷钨酸(H3PW12O40.xH2O)和邻菲啰啉(C12H8N2.H2O)的溶液反应合成了Keggin结构杂多化合物(C12H8N2)2.5.H3PW12O40,用电感耦合等离子体原子发射光谱(ICP-AES)、元素分析(EA)、热重-差热分析(TG-DTA)、傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)和紫外-可见漫反射光谱(UV-vis DRS)对产物进行了表征。该化合物具有光致变色效应,在日光或紫外光的直射下,固体粉末由白色变为蓝色,空气中避光放置又变为白色。该化合物在高压汞灯照射下对甲基橙水溶液的脱色反应表现出较好的光催化活性,催化剂重复使用效果好。

Heteropoly compound（C12H8N2）2.5·H3PW12O40 with Keggin structure was prepared via a solution reaction between phosphotungstic acid（H3PW12O40·xH2O）and phenanthroline（C12H8N2·H2O）,and characterized by inductively coupled plasma atomic emission spectroscopy（ICP-AES）,elemental analysis（EA）,thermogravimetry-differential thermal analysis（TG-TDA）,Fourier transform infrared spectroscopy（FT-IR）,X-ray diffractometry（XRD）,and UV-vis diffuse reflectance spectroscopy（UV-vis DRS）,respectively.The resulting compound showed photochromic property.Irradiated with solar light or UV-light,the white powered product turned blue and it could bleach completely with ambient air in the dark.The compound exhibited significant heterogeneous photocatalytic activity for decolorization of methyl orange（MO）with irradiation under a high-pressure mercury lamp,and could be easily recycled without notable decrease of photocatalytic activity.