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.

Synthesis of ZnIn2S4/g-C3N4 Nanocomposites with Efficient Photocatalytic H2 Generation Activity by a Simple Hydrothermal Method

ZnIn₂S₄/g-C₃N₄ composites were prepared by a simple hydrothermal method and characterized by means of X-ray diffraction（XRD）， Fourier transforms infrared spectroscopy（FTIR）， UV-Vis diffuse reflectance spectroscopy（UV-Vis DRS）， transmission electron microscopy（TEM）， and fluorescence spectroscopy（PL）. The results show that when the loading capacity of ZnIn₂S₄ is 20%（mass fraction）， the composite shows the best performance of photocatalytic hydrogen production， and the rate of hydrogen production can reach 637.08 μmol ·g^-1·h^-1， which is 4 times and 37 times of pure ZnIn₂S₄ and pure g-C₃N₄， respectively. The reason is that ZnIn₂S₄/g-C₃N₄ has a tight heterojunction interface， which improves the energy band matching and interfacial charge transfer of the components， thus effectively enhancing the separation and transport of charge carriers， and improving the photocatalytic performance.