Nanocomposite and its preparation method

The present invention discloses a Sn @ C @ g-C3N4 nanocomposite and its preparation method, belonging to the technical field of the preparation of nanomaterials. The nano composite material microstructure of Sn @ C nanocapsules embedded core-shell structure nano-g-C3N4 sheet, the diameter of the nanocapsules is 5 ~ 100nm. The present invention uses a plasma arc discharge method, the melamine powder, tin powder and pressed into a certain percentage of the atomic block as an anode target material, graphite as a cathode material, reference argon and methane as the working gas, a graphite cathode electrode and the anode target tin - melamine between the powder mass at a distance, from the arc discharge, i.e., to obtain Sn @ C @ g-C3N4 nanocomposites between the anode and the cathode. The nanocomposite visible high catalytic activity and simple preparation process, no post-treatment process, low cost, easy industrial production.