混合配体Cd-MOF的合成及其光催化降解性能

Preparation of Mixed Ligand Cd-MOF and Its Photocatalytic Performance

以四水硝酸镉、均苯三甲酸、乳酸和N,N-二甲基甲酰胺为原料,采用溶剂热合成方法,制备得到混合配体Cd-金属有机框架(MOF)材料。利用偏光显微镜、扫描电子显微镜、热重分析仪、Fourier红外光谱、X射线衍射仪、N_2吸附–脱附分析、紫外–可见漫反射光谱等手段对其进行表征。以亚甲基蓝(MB)溶液为模拟污染物,室温条件下考察了该材料在紫外光下的光催化活性。研究表明:当混合配体Cd-MOF作为光催化剂时,当其用量为70 mg,MB初始浓度为40 mg/L、pH=8～10时,在2 h内降解率可达80%左右,而且混合配体Cd-MOF经过5次循环试验后仍能保持较稳定的光催化活性。

A mixed ligand Cd-MOF hybrid material was prepared by a solvothermal synthesis method using cadmium tetrahydrate tetrahydrate,trimesic acid,lactic acid and N,N-dime-thylformamide as polarizing materials.The as-obtained samples were characterized by polarizing microscopy,X-ray diffraction,scanning electron microscopy and energy dispersive X-ray spectroscopy,Fourier transform infrared spectroscopy,thermogravimetric analysis,N2 absorption-desorption and ultraviolet-visible diffuse reflection spectroscopy.The methylene blue(MB)was used as a model organic pollutant,and the photocatalytic activity of the hybrid material under ultraviolet light at room temperature was examined.The results show that the degradation rate can reach 80%within 2 h when the mixed ligand Cd-MOF is used as a photocatalyst at the amount of 70 mg,the MB initial concentration of 40 mg/L,and the pH values of 8-10.Furthermore,the mixed ligand Cd-MOF can keep its photocatalytic stability after five recycles.