Preparation And Photocatalytic Properties Of ZnO Core-Shell Structures Based On Energy And Modulation

With industrial and economic development, global environmental pollution is worsening. Therefore, preparation of high photocatalytic activity ZnO nanomaterials could be a potential way to solve this problem. This thesis aims to improve the photocatalytic activity through preparation the ZnO core-shell nanostructures based on energy band gap modulation, the main contents were as following:(1) The spherical-like SiO2@ZnO core-shell structures were synthesized by Stober method and hydrothermal method. The results show that the spherical-like SiO2@ZnO core-shell structures photocatalyst enhanced the degradation of rhodamine B (RhB) up to11%after3h of irradiation.(2) The ZnO nanoflowers doped with cadmium ions have been prepared by a hydrothermal method. The results show that with the Cd doping, the band gap decreased from3.24eV to3.06eV. Then, the5%Cd-doped ZnO nanoflowers showed the highest photocatalytic activity which increased the rate of photocatalytic degradation of rhodamine B (RhB) up to98%after3h of irradiation.(3) The tube-brush-like ZnO nanostructures were synthesized by hydrothermal method using electrospinning polyvinylpyrrolidone (PVP) nanofibers as templates. The results show that the photocatalytic activity of tube-brush-like ZnO nanostructures enhanced. The degradation of rhodamine B (RhB) was up to98%after2h of irradiation.