Porphyrin unit modified natural clay supported Au-Cu composite catalyst and preparation method thereof

The invention discloses a porphyrin unit modified natural clay supported Au-Cu composite catalyst and a preparation method thereof. The preparation method comprises the following steps: firstly, selectively etching the inner wall structure of a natural clay halloysite nanotube to increase the specific surface area and enrich the pore structure, modifying a porphyrin unit on the surface of the halloysite nanotube in an interface bonding manner to realize amino site functionalization, immobilizing Au and Cu precursors on the site through electrostatic adsorption, and carrying out two-step reduction heat treatment to obtain the porphyrin-supported Au/Cu composite photocatalyst. The preparation method comprises the following steps: firstly, preparing a high-dispersion Au nano-cluster, enriching Cu ions in Au crystals, then reducing the Cu ions into Au-Cu nano-particles, realizing in-situ anchoring and dispersion of the ultra-small Au-Cu nano-particles in a carrier structure, and finally, carrying out packaging an