Degradable photothermal conversion film material and preparation method thereof

Abstract

The invention relates to a degradable photothermal conversion film material and a preparation method thereof. The preparation method comprises the following steps that 1, polylactic acid is dissolved into an organic mixed solvent, and uniform stirring is carried out to obtain a mixed solution; 2, a pore-foaming agent and a nanofluid prepared by adopting an ion exchange method are doped, and stirring is carried out to obtain a spinning solution; 3, a fiber membrane is spun by utilizing the spinning solution; 4, the fiber membrane is washed and etched, the pore-foaming agent is removed, and drying is carried out to obtain a porous fiber membrane; and 5, a carbon material and a hydrophobic material with photo-thermal effects are sprayed on the surface of the porous fiber membrane to obtain the degradable photothermal conversion membrane material. According to the degradable photothermal conversion film material and the preparation method thereof, the characteristics that the nanofluid has high surface activity on an air / polymer interface and tends to migrate to the surface of polymer fibers are utilized, after the pore-foaming agent is removed, the nanofluid gradually migrates into the pores and is finally embedded in the pores, aggregation, crystallization and precipitation of salt can be prevented through the ingenious structure, the blockage of pore channels is avoided, and the water absorption and salt resistance of the membrane are improved.

Description

technical field [0001] The invention relates to the technical field of light-to-heat conversion, in particular to a degradable light-to-heat conversion film material and a preparation method thereof. Background technique [0002] With the growing population and serious water pollution, the shortage of drinking water has become a serious global problem, especially in poor areas. Efforts have been made to develop technologies for extracting fresh water from seawater and wastewater, however, these technologies still face great challenges in achieving high efficiency, long-term stability, low cost, and large-scale production. As a clean energy with abundant reserves and sustainable development, solar energy is collected and converted into heat energy for steam power generation. Since existing ions, organic matter, and bacteria can be separated in an economical and environmentally friendly process, solar-driven water evaporation is considered to be a highly promising technology ...

AI Technical Summary

Problems solved by technology

Nanoparticles such as gold, titania and alumina are proposed for steam generation and water purification Poor chemical stability, high cost, and low yield limit their large-scale applications

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