▎ 摘　　要

NOVELTY - A porous ceramic membrane comprises titanium diboride-titanium carbide or nitride-titanium-silicon carbide porous ceramic support with two-dimensional nano-photothermal material grown in or on surface of the porous ceramic support, and/or carbon nanomaterial deposited on the surface of the pore structure of the porous ceramic support. The porous ceramic membrane is formed by reaction of the raw materials and the external pore former to form three-dimensional connected multi-stage porous structure with three pore sizes of 10 mu m, 20-80 mu m and 100-800 mu m. USE - Porous ceramic membrane used in photothermal seawater desalination process (claimed). ADVANTAGE - The porous ceramic membrane has high self-cleaning function and high seawater desalination efficiency, and excellent light absorption rate due to three-dimensional porous structure, thereby improving the photothermal conversion efficiency. DETAILED DESCRIPTION - A porous ceramic membrane comprises titanium diboride-titanium carbide or nitride-titanium-silicon carbide (TiB2+Ti(C,N)+Ti3SiC) porous ceramic support with two-dimensional nano-photothermal material grown in or on surface of the porous ceramic support, and/or carbon nanomaterial deposited on the surface of the pore structure of the porous ceramic support. The porous ceramic membrane is formed by reaction of the raw materials and the external pore former to form three-dimensional connected multi-stage porous structure with three pore sizes of 10 mu m, 20-80 mu m and 100-800 mu m. INDEPENDENT CLAIMS are included for the following: (1) preparation of the porous ceramic membrane, which involves using titanium, boron carbide, graphitic carbon nitride (C3N4), silicon carbide powder, 15 vol.% ammonium bicarbonate as pore former, nitrogen source, carbon nanomaterial, tungsten trioxide and sulfur; and (2) method for using the porous ceramic membrane in interface photothermal seawater desalination process, which involves combining the porous ceramic membrane with polyethylene foam and cotton to make photothermal evaporator, using polyethylene foam as insulator to reduce the heat conduction loss during the evaporation process and cotton as transmission channel for seawater, placing the photothermal porous ceramic material and evaporator in PTFE container containing seawater, placing container on the balance, irradiating with analog light source, recording the quality changes at different times, calculating the evaporation rate of seawater to obtain photothermal conversion efficiency.