Preparation method and application of double-porphyrinyl organic semiconductor photocatalyst

The invention provides a preparation method and application of a double-porphyrinyl organic semiconductor photocatalyst. Belongs to the technical field of photocatalysis, and can realize efficient conversion of the coenzyme NADH under weak light without depending on special strong light equipment and rhodium complex electronic media. According to the technical scheme, the preparation method comprises the following steps: (1) dissolving porphyrin A in water to assemble the porphyrin A to obtain a porphyrin self-assembled solution A; (2) dissolving porphyrin B in water to obtain a porphyrin solution B; (3) adding the porphyrin solution B into the porphyrin self-assembly solution A to obtain a double-porphyrin assembly solution; and (4) adding a potassium tetrachloroplatinate solution and an electron-donating reagent solution into the double-porphyrin assembly solution, and performing illumination to obtain the double-porphyrinyl organic semiconductor photocatalyst. The obtained double-porphyrinyl organic semico