▎ 摘　　要

NOVELTY - Photothermal conversion material with nano heterostructure comprises a bacterial cellulose film, and reduced graphene oxide and carbon nanotubes (rGO and CNT) distributed in it. The rGO and CNT constitute a heterogeneous structure, i.e., CNTs are grown in-situ on the surface of rGO as artificial fold structure. USE - Used as photothermal conversion material with nano heterostructure. ADVANTAGE - The material: exhibits a good light trapping phenomenon through a heterogeneous structure; reduces the energy loss of sunlight due to reflection; and improves the light absorption efficiency. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the photothermal conversion material with a nano heterostructure, comprising using original bacterial solution of Acetobacter xylinum, adding the precursor CNT aqueous solution and the precursor GO aqueous solution to the Hoagland's nutrient solution (HS) for inoculation, after obtaining the bacterial cellulose composite membrane, reducing the GO to obtain the photothermal conversion material with nano-heterogeneous structure; and (2) use method of the photothermal conversion material with nano heterostructure, comprising assembling light-to-heat conversion material with nano-heterogeneous structure, bacterial cellulose film and polystyrene foam together from top to bottom to form a solar interface seawater evaporator.