Photocatalytic material sulfur-doped polyimide hollow spheres and preparation method thereof

The invention discloses a sulfur-doped polyimide hollow sphere photocatalytic material and a preparation method thereof, and relates to the technical field of photocatalytic materials. The preparation method comprises the steps of: firstly, preparing template silicon balls, grinding and mixing the silicon ball template, melamine, pyromellitic dianhydride and sublimed sulfur, dissolving the mixture with absolute ethyl alcohol, stirring in vacuum, carrying out ultrasonic treatment at 60 DEG C for 2 hours, stirring at 60 DEG C for 10-12 hours, grinding the obtained solid, putting the ground solid into a tubular furnace, introducing nitrogen for firing, taking out and grinding the solid, adding the ground solid powder into an ammonium hydrogen fluoride solution, alternately washing with deionized water and absolute ethyl alcohol for three times, and drying in a vacuum state for 10-12 hours to obtain a nano hollow sphere material. Compared with traditional SPI, the photocatalytic efficiency of the hollow sphere ph