Composite photocatalytic material tin sulfide/sulfur-doped polyimide and preparation method thereof

The invention relates to a composite photocatalytic material tin sulfide/sulfur-doped polyimide and a preparation method, and relates to the technical field of photocatalytic materials. The preparation method comprises the steps of: firstly, preparing SPI from inorganic elemental sublimed sulfur, pyromellitic dianhydride and melamine through a solid-phase thermal method, dropwise adding a crystalline tin tetrachloride aqueous solution and a thioacetamide aqueous solution into the SPI aqueous solution by adopting an in-situ crystallization growth method, stirring, and carrying out thermal polymerization in a reaction kettle to obtain a tin sulfide quantum dot/sulfur-doped pi-conjugated polyimide composite catalytic material. The organic photocatalytic material has the beneficial effects that the organic photocatalytic material with visible light absorption performance is obtained through simple reactants and a preparation method, organic pollutants in water can be photodecomposed by utilizing sunlight, and the