▎ 摘　　要

NOVELTY - Photocatalyst comprises 3-15 pts. wt. functionalized carbon nanotubes, 1-5 pts. wt. graphene and 20-60 pts. wt. carbon nitride. USE - Used as photocatalyst. ADVANTAGE - The metal element can be used in the absence of light conditions, has does not contain metal elements, simple craftwork and is feasible, does not need expensive equipment, has convenient and flexible and is convenient to operate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the photocatalyst does not contain metal element, comprising placing carbon nanotubes in a mixture of 14.5 mol/l concentrated nitric acid and 18.4 mol/l concentrated sulfuric acid in a ratio of 1:3, heating the mixture at 60-80 degrees C, insulating for 2-6 hours, subjecting the mixture for pumping and filtering or centrifuging, washing until neutral to obtain functionalized carbon nano tube, placing the functionalized carbon nanotubes in a mixture of water and isopropanol in a volume ratio of 3:2, continuously stirring for 2-6h to obtain carbon nano tube dispersing liquid, ensuring in the carbon nanotube dispersion, the concentration of carbon nanotubes is 9-18 mg/ml, adding the graphene into the carbon nanotube dispersion, continuously stirring for 3-5 hours on the magnetic stirrer, sonicating for 2-4 hours to obtain carbon nanotube/ graphene dispersion, taking the carbonitride into a carbon nanotube/graphene dispersion, sonicating for 1-5 hours to obtain final dispersion, subjecting the final dispersion to hydrothermal reaction at 140-180 degrees C for 10-24 hours and cooling to room temperature, freeze drying at -50 degrees C to -20 degrees C for 2-12 hours to obtain photocatalyst.