Preparation and application of photo-deposition composite photo/piezoelectric cocatalyst Au-[DFCBA] 2CuCl4 nanocrystal

The invention relates to the field of light/piezoelectric co-catalysis, in particular to a preparation method of a light/piezoelectric co-catalyst Au-[3, 3-difluorocyclobutyl ammonium] 2CuCl4 nanocrystal, which comprises the following steps: (1) respectively dissolving [DFCBA] Cl and CuCl2 in 1mL of DMF (Dimethyl Formamide) solution, mixing, and adding oleic acid as a ligand; (2) fully reacting at room temperature for 10 minutes, adding 40 mL of ethyl acetate, centrifugally washing, drying and precipitating to obtain [DFCBA] 2CuCl4 nanocrystals; (3) weighing a proper amount of [DFCBA] 2CuCl4 nanocrystal powder, dispersing the [DFCBA] 2CuCl4 nanocrystal powder into an ethyl acetate solution in which chloroauric acid and a sacrificial reagent are dissolved, and depositing Au nanoparticles on the surface of the nanocrystal through ultraviolet irradiation to prepare the required Au-[DFCBA] 2CuCl4 nanocrystal; and (3) carrying out optical/piezoelectric co-catalytic degradation on the organic pollutant Sudan red (I