UiO-66-NH_(2)/BiOI复合材料的合成及光催化性能研究

Study on synthesis and photocatalytic performance of UiO-66-NH_(2)/BiOI composites

本文采用水热法合成了一系列球状的UiO-66-NH_(2)/BiOI(UN/BOI)复合材料,并对复合材料的理化性质进行了分析研究。制备的UiO-66-NH_(2)(UN)的尺寸约为100nm,锚定在直径约为2μm的BiOI(BOI)表面及其内部,形成了高稳定性复合材料。光催化降解实验表明,5%UN/BOI纳米复合材料在可见光照射120min时,对罗丹明B的降解率达到91.7%,其催化速率常数(0.0183min^(-1))是纯BOI(0.0078min^(-1))的2.35倍。机理研究表明,复合材料的异质结构促进了光催化过程中光生电荷的分离和传输,降低了光生电子-空穴对的复合率,从而提升复合材料的光催化性能。

In this paper,a series of spherical UiO-66-NH_(2)/BiOI(UN/BOI)composites were synthesized by hydrothermal method,and the physicochemical properties of the composites were analyzed and studied.The prepared UiO-66-NH_(2)(UN),with a size of about 100nm,was anchored on the surface of BiOI(BOI)with a diameter of about 2μm and inside it,forming a highly stable composite.The photocatalytic degradation experiments showed that 5%UN/BOI nanocomposite achieved 91.7%degradation of rhodamine B at 120min of visible light irradiation,and its catalytic rate constant(0.0183min^(-1))was 2.35 times higher than that of pure BOI(0.0078min^(-1)).The mechanism study shows that the heterojunction structure of the composite promotes the separation and transport of photogenerated charges in the photocatalytic process and reduces the complexation rate of photogenerated electron-hole pairs,thus enhancing the photocatalytic performance of the composite.