Preparation method of porphyrin/carbon nitride layer-by-layer composite structure photocatalytic nano-composite material

The invention discloses a preparation method of a porphyrin/carbon nitride layer-by-layer composite structure photocatalytic nano-composite material. The preparation method comprises the following steps: taking and dissolving melamine and L-alpha glycerylphosphorylcholine in deionized water, carrying out a hydrothermal reaction in a hydrothermal kettle, centrifuging the obtained solution, and washing and drying the obtained reaction product to obtain a solid; adding KOH and a carbon fiber into the solid, performing mixing, putting the obtained mixture into a crucible, putting the crucible intothe resonant cavity of a microwave oven, and performing vacuum heating to obtain a heated product; cooling the heated product to room temperature, and washing, drying and grinding the cooled heated product to obtain a carbon nitride powder; dissolving the carbon nitride powder into anhydrous ethanol to obtain a solution A; adding TCPP into anhydrous ethanol to prepare a solution B; adding the solution B into the solution