二维复合光催化剂的合成及其性能研究

摘要：通过超声辅助溶剂热法制备一种新型的二维类复合光催化剂BiOCl/MOF-5。运用XRD、SEM、BET、TEM、PL 等手段对催化剂的特殊结构和性能进行表征。在该光催化剂体系中，选取MOF-5为载体，通过与光催化剂BiOCl复合来合成一种新型的二维复合光催化剂。 结果表明，制备的催化剂均呈现出较为明显的二维形貌，且相对与单一BiOCl (3.15 mg2?g-1 )来说，该复合催化剂 (110.16 mg2?g-1 ) 的比表面积得到了明显的提高。由于催化剂的光催化性能与其比表面积和孔隙体积密切相关。复合催化剂相对较大的比表面积和适当的能带隙，有利于为反应物提供更多的活性位点和有效的传输路径，而且得益于MOF-5独特的形貌和结构，光催化剂聚集和比表面积小的问题也得到了解决。因此，该复合材料在降解有机物方面呈现出优异的光催化活性，且与纯BiOCl相比，催化剂的光催化活性得到了明显的提高。

Synthesis and properties of two-dimensional composite photocatalyst

Abstract: A novel two-dimensional photocatalyst BiOCl/MOF-5 were successfully synthesized via a facile ultrasonic assisted solvothermal method. X-ray diffraction, scanning electron microscope, Transmission Electron Microscope, Brunauer-Emmett-Teller, UV-visible diffuse reflectance spectrum, photoluminescence were employed to characterize and investigate its unique structure and property. In this photocatalytic system, MOF-5 was chosen as a substrate, based on a novel BiOCl catalyst to achieved a fire-new composite. The results showed that the specific surface area of the BiOCl/MOF-5 composite photocatalyst (110.16 mg2?g-1 ) is significantly higher than single BiOCl (3.15 mg2?g-1 ) and all present a good two-dimensional morphology. Compared with the pure BiOCl, the composite exhibits outstanding photocatalytic activity in degrading organic species. Thanks to the unique structure and characteristics of MOF-5, the problem of composite catalyst aggregation and the small specific surface area is well solved. In addition, relative large specific surface area and appropriate energy band gap, which is beneficial for the photocatalytic reactions by providing more active sites and efficient transport paths for reactants. The photocatalytic properties of catalysts are closely related to their specific surface area and pore volume. Hence, the photocatalytic activity is obviously improved.