ZnIn2S4/g-C3N4复合材料的制备及可见光催化制氢性能

采用水热方法制备了ZnIn₂S₄/g-C₃N₄复合材料, 并通过X射线衍射(XRD)、 傅里叶变换红外光谱(FTIR)、 紫外-可见漫反射光谱(UV-Vis DRS)、 透射电子显微镜(TEM)和荧光光谱(PL)等手段对其结构和性能进行表征. 结果表明, 当ZnIn₂S₄的负载量为20%(质量分数)时, 复合材料表现出最佳的光催化制氢性能, 制氢速率可达到637.08 μmol·g^-1·h^-1, 分别为纯ZnIn₂S₄和纯g-C₃N₄的4倍和37倍. 其原因在于ZnIn₂S₄和g-C₃N₄之间具有紧密的异质结结构, 两者有效的结合改善了组分的能带匹配和界面电荷转移, 从而大幅增强了载流子的分离和迁移, 进而提高光催化的性能.     

A New 3-D Network Based on Large Mo18-Polyoxometalate Anionic Units and Alkaline Cations

The new polyoxomolybdate 1 was prepared from an aqueous solution by the reaction of Na2MoO4·H2O, NH2NH2·2HCl and HCOONa, and characterized by IR spectroscopy, elemental analysis and single-crystal X-ray structural analysis. Crystal data: C4H72ClMo18Na13O94, Mr = 3685.86, triclinic, space group P, a = 11.922(5), b = 15.003(5), c = 15.171(5) , α = 116.073(5), β = 112.593(5), γ = 93.342(5)o, V = 2164.3(14) 3, Z = 1, Dc = 2.828 g/cm3, F(000) = 1764, μ = 2.741 mm-1, R = 0.0349 and wR = 0.0875 (I > 2σ(I)). X-ray crystal structure analysis shows that 1 is constructed by Mo18 polyoxoanions linked by Na+ cations to form a fascinating 3D open framework with “guest” Na+ cations and formyl groups residing in the channels.