基于稀土金属构筑的半导体MOF材料的光催化性能研究

Studies on the Photocatalytic Property of Lanthanide based MOF

以2,5-二羟基-1,4-对苯二甲酸(H_4DHBDC)和Dy(NO_3)_3·6H_2O为原料制备了配合物[Dy_2(H_2-DHBDC)_2(DHBDC)_(0.5)(H_2O)_3]_n (1)。利用X-射线单晶衍射和元素分析对产物的结构和纯度进行了表征。通过紫外-可见漫反射吸收光谱(UV-Vis)表征了材料的光响应能力,并在光照条件下研究了所得材料对染料亚甲基蓝(MB)的光催化效果。结果表明,所得材料为窄带隙能半导体(E_g=2.38e V),在紫外光照射条件下,75min后对MB溶液基本完全降解,其降解动力学曲线符合准一级动力学方程,速率常数为2.27~*10^(-2)min^(-1)。

The complex, [Dy2（H2-DHBDC）2（DHBDC）（0.5）（H2 O）3]n[1, H2-DHBDC is 2,5-dihydroxy-1,4-terephthalate ion] was successfully prepared by hydrothermal method using 2,5-dihydroxy-1,4-terephthalic acid and Dy（NO3）3·6 H2O as materials. Its structure and purity was characterized by elemental analysis and X-ray single crystal diffraction. The optical response of the material was characterized by ultraviolet-visible diffuse reflectance absorption spectroscopy（UV-Vis）.The adsorption and degradation of the dye methylene blue（MB） was used to characterize its photocatalytic property. Results show that the MOF is a narrow band gap semiconductor（Eg=2.38 eV）. Under UV light irradiation, the MB solution was almost completely degraded after 75 min, and the degradation kinetic curve could be fitted by the pseudo first-order kinetics with k=2.27＊10-2 min-1.