Degradable photothermal conversion film material and preparation method thereof

Abstract

The invention relates to a degradable light-to-heat conversion film material and a preparation method thereof, comprising the following steps: 1. Dissolving polylactic acid in an organic mixed solvent and stirring evenly to obtain a mixed solution; 2. Adding a porogen and using ion The nanofluid prepared by the exchange method is stirred to obtain a spinning solution; 3. The fiber membrane is spun by the spinning solution; 4. The fiber membrane is washed and etched to remove the porogen and dried to obtain a porous fiber membrane; 5. The surface of the fiber membrane is sprayed with carbon materials and hydrophobic materials with photothermal effects to obtain a degradable photothermal conversion membrane material. The present invention utilizes the characteristics that the nanofluid has high surface activity at the air / polymer interface and tends to migrate to the surface of the polymer fiber. After the porogen is removed, the nanofluid gradually migrates into the hole and is finally embedded in the hole. Among them, through this ingenious structure, it can prevent the aggregation and crystallization of salt, avoid the blockage of pores, and improve the water absorption and salt resistance of the membrane.

Description

technical field [0001] The invention relates to the technical field of photothermal conversion, in particular to a degradable photothermal conversion film material and a preparation method thereof. Background technique [0002] With population growth and water pollution, drinking water shortages have become a serious global problem, especially in poor areas. Efforts have been made to develop technologies to extract 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 an abundant, sustainable and clean energy source, solar energy is collected and converted into heat for steam generation. Since existing ions, organics, and bacteria can be separated in an economical and environmentally friendly process, solar-driven water evaporation is considered a highly promising water purification technology. The traditional water vapor generation system...

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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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