▎ 摘　　要

NOVELTY - Preparing sodium-boron co-doped carbon nitride photocatalyst comprises (1) mixing sodium salt and melamine and grinding thoroughly in mortar, placing in crucible, calcining in tube furnace under the protection of argon, heating in room temperature, keeping for calcination, naturally cooling to room temperature, washing with deionized water under the assistance of ultrasound, collecting by filtration, and freeze-drying to obtain sodium single-doped carbon nitride nanosheets, (2) mixing sodium borohydride with sodium single-doped carbon nitride nanosheets, fully grinding in mortar, placing in quartz boat, calcining in tube furnace under the protection of argon, heating in room temperature, keeping for calcination for 0.2-1 hours, naturally cooling to room temperature, washing three times with deionized water under the assistance of ultrasound, collecting by filtration, and freeze-drying to obtain sodium-boron co-doped carbon nitride nanosheets. USE - The photocatalyst is useful for catalyzing and degrading antibiotic in waste water under visible light. The composite membrane is useful in photocatalytic degradation of antibiotics in waste water (all claimed). ADVANTAGE - The method: is simple and the operation is easy; optimizes the energy band structure of the catalyst; and improves the catalytic efficiency of visible light. The composite membrane achieves surface confinement by intercepting antibiotics to enhance the degradation and removal effect of antibiotics. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: odium-boron co-doped carbon nitride photocatalyst prepared by the method; use method of the photocatalyst, comprising adjusting pH of the antibiotic waste water to neutrality, adding the carbon nitride photocatalyst of described sodium-boron co-doping, where the concentration of antibiotics in wastewater is below 20 ppm, the solid-liquid ratio of photocatalyst to wastewater is 1 mg:0.5-2 ml, placing formed suspension in dark room and stirring for 20-40 minutes to achieve adsorption-desorption equilibrium, carrying out the photocatalytic degradation reaction under the illumination of xenon light, where the illumination wavelength is above 420 nm, the illumination intensity is 200-300 mW/cm2, and the antibiotic is preferably sulfamethoxazole; reduced graphene oxide composite membrane with synergistic catalytic separation, where the preparation method of the composite membrane comprises (i) reducing graphene oxide solution by ultraviolet light, using the support membrane as the base to filter to form film, and drying to form reduced graphene oxide film on the surface of the support membrane, and (ii) dispersing the sodium boron co-doped carbon nitride photocatalyst in water to form suspension, suction-filtering the sodium-boron co-doped carbon nitride photocatalyst onto the surface of the reduced graphene oxide film, cross-linking and fixing by cross-linking agent, and drying to obtain reduced graphene oxide film with synergistic catalytic separation; and use method of the reduced graphene oxide composite membrane of synergistic catalytic separation, comprising adopting the mode of dead-end filtration to be used for intercepting and degrading the antibiotic in waste water under the light, making waste water pass through reduced graphene oxide composite membrane under the pressure of 1.5-3 bar, where the antibiotic is preferably sulfamethoxazole.