Energy self-sufficient high-efficiency photo-thermal evaporative nano-particle porous membrane, preparation method and application thereof

A method for preparing a high-efficiency photothermal evaporative nano-particle porous membrane, comprising steps as follows:

• (1), dissolving polymer A in solvent B to obtain solution A;
• and dripping solution A into solvent C to obtain a polymer A nano hydrogel dispersion;
• (2), evenly mixing polymer A nano hydrogel dispersion and nano particle dispersion of photothermal conversion material D to obtain a co-blended dispersion;
• performing suction-filtering to the co-blended dispersion on a surface of a solvent-resistant membrane E to form an A-D co-blended membrane;
• and
• (3), performing suction-filtering to a solvent F using the A-D co-blended membrane, and drying to obtain a high-efficiency photothermal evaporative nano-particle porous membrane;
• wherein the polymer A in the step (1) comprises at least one selected from a group of polymethyl methacrylate (PMMA), polyether sulphone and polyvinylidenefluoride;
• the solvent B in the step (1) is at least one selected from a group of tetrahydrofuran, dimethylformamide, dimethyl sulfoxide, dichloromethane and acetone;
• the solvent C in the step (1) is at least one of water and ethanol;
• the photothermal conversion material D in the step (2) is at least one of polypyrrole (PPy), polyaniline and poly dopamine;
• the solvent-resistant membrane E is a nylon microfiltration membrane, a polyvinylidene fluoride microfiltration membrane or a polytetrafluoroethylene microfiltration membrane;
• the solvent F in the step (3) is at least one selected from a group of tetrahydrofuran, dimethylformamide, dimethyl sulfoxide, dichloromethane and acetone;
• and
• the polymer A nano hydrogel dispersion and the nano particle dispersion of photothermal conversion material D in the step (2) are used in an amount proportioned according to a mass ratio of the polymer A:the photothermal conversion material D=16−120:3.