Photocatalytic material, preparation method, hydrogen production method and application

The invention discloses a photocatalytic material, a preparation method, a hydrogen production method and application. The photocatalytic material comprises a CdS nano material and an aniline long-chain polymer, and the aniline long-chain polymer is combined on the surface of the CdS nano material. An aniline long-chain polymer is added on the surface of a CdS nano material, and the aniline long-chain polymer is coordinated with an S vacancy in CdS or is physically adsorbed on a CdS photocatalyst through Van der Waals force to form a long-chain ligand. After absorbing visible light, CdS generates photo-induced electron-hole pairs, due to the fact that aniline long-chain polymers have excellent hole transmission capacity, holes are efficiently conducted through a long-chain structure to be separated from electrons, the probability of compounding of the photo-induced electron-hole pairs is reduced, H < + > in water can capture more electrons, and therefore the efficiency of hydrogen production through water pho