电气石/ZnO复合材料光催化机制

采用一步水热法制备电气石/ZnO的复合材料。利用X射线衍射仪、扫描电子显微镜、X射线荧光光谱仪、UV-Vis DRS对样品的结构、形貌和光学性能进行表征。在可见光照射下,以酸性品红为降解物,研究电气石/ZnO复合材料的光催化性能,并通过动力学模型模拟酸性品红被降解的过程。结果表明:电气石加入并没有对ZnO的花瓣形貌产生影响,但对其光催化性能影响很大。随着电气石含量的增大,光催化性能先增长后降低。当电气石含量为5%(质量分数)时,光生电子-空穴复合概率降低,禁带宽度也下降,羟基自由基(·OH)的浓度增大,光催化效率达到最大96.62%,并且发现ZnO和电气石/ZnO复合材料的催化降解遵循一级动力学模型。

Photocatalytic mechanism of tourmaline/ZnO composites

Tourmaline/ZnO composite material was prepared by one-step hydrothermal method. The structure, morphology and optical properties of the samples were characterized by X-ray diffraction, scanning electron microscopy, X-ray fluorescence spectroscopy and UV-Vis DRS. Under visible light irradiation, the photocatalytic performance of tourmaline/ZnO composite was studied using acid fuchsin as a degradation product. The kinetic model was used to simulate the degradation process of acid fuchsin. The results show that the addition of tourmaline does not affect the morphology of ZnO petals, but has a great influence on its photocatalytic properties. With the increase of the content of tourmaline, the photocatalytic performance first increases and then decreases. When the content of tourmaline is 5%(mass fraction), the recombination probability of photogenerated electron-hole decreases, the forbidden band width decreases, the concentration of hydroxyl radical (·OH) increases and the photocatalytic efficiency reaches the maximum 96.62%, ZnO and tourmaline/ZnO catalytic degra-dation of composites follows a first-order kinetic model.