Preparation method of cross-shaped nitrogen-doped carbon-coated Cu2O/Cu (Cu2O/Cu/N-C) mesoporous photocatalyst

The invention discloses a preparation method of a cross-shaped nitrogen-doped carbon coated Cu2O/Cu (Cu2O/Cu/N-C) mesoporous photocatalyst. The method comprises the following steps: dissolving copper nitrate in a mixed solution of ethanol and N, N-dimethylformamide to obtain a solution (a), then adding benzimidazole into a mixture of ethanol and N, N-dimethylformamide to obtain a solution (b), transferring the mixed solution into a round-bottom flask for heating, and after the reaction is finished, centrifuging, washing and drying to obtain the HKUST truncated octahedron; the preparation method comprises the following steps: dissolving HKUST in water, adding a certain amount of tannic acid, stirring for a period of time at room temperature, and centrifuging, washing and drying to obtain the cross-shaped HKUST after the reaction is finished. The cross-shaped HKUST is calcined in a tubular furnace, and the cross-shaped mesoporous Cu2O/Cu/N-C is synthesized. The obtained nitrogen-doped carbon-coated Cu2O/Cu (Cu2