Preparation method and application of magnetic multilayer composite recoverable ultraviolet light catalyst

The invention relates to a preparation method and application of a magnetic multilayer composite recoverable ultraviolet light catalyst. The invention belongs to the field of photocatalytic nano materials and preparation thereof. The invention aims to solve the technical problems of low catalytic activity and poor light solubility of the existing photocatalyst. The preparation method comprises the following steps: improving a polyhydric alcohol method through microwave-assisted heating and surface active agent coating so as to prepare nano Fe3O4NCs particles, combining charged particles with different electronegativity under the condition of a strong magnetic field by utilizing an electrostatic acting force, and respectively loading SiO2 and TiO2 nanoparticles through two-step reaction of room-temperature hydrolysis and high-temperature hydrothermal treatment by adopting a self-assembly method. The magnetic core-shell nano composite material is applied to removal of antibiotic wastewater containing sulfametho