A kind of pyramid-shaped solar photothermal evaporator and preparation method thereof

Abstract

The invention discloses a pyramid-shaped solar photothermal evaporator, which comprises a heat insulation layer, a water delivery channel and a pyramid-shaped photothermal evaporation structure. The pyramid-shaped photothermal evaporation structure includes four photothermal absorption surfaces, and each photothermal absorption surface includes a number of gradually expanding water collection microchannels extending from the top of the pyramid to the bottom; The surface layer of meta-nanoparticles, the middle hydrophilic layer, and the bottom substrate. The water delivery channel is composed of water-absorbing cotton core, which is located in the parallel channels set in the heat insulation layer, its lower end protrudes into the water body, and its upper end is connected with the water-collecting microchannel on the light-heat absorbing surface. The pyramid-shaped three-dimensional photothermal evaporation structure of the invention greatly increases the photothermal evaporation area, and at the same time uses plasmonic nanoparticles to achieve high-efficiency photothermal conversion. In addition, the water collection microchannel and the hydrophilic layer ensure the rapid and sufficient supply of evaporated water. In order to achieve high-efficiency solar evaporation and seawater desalination. The present invention also provides a preparation method of the above-mentioned evaporator.

Description

technical field [0001] The invention relates to the technical field of photothermal evaporation, in particular to a three-dimensional pyramid-shaped solar photothermal evaporator and a preparation method thereof. Background technique [0002] Seawater desalination is an ideal way to solve water shortages. Seawater desalination technology based on solar photothermal evaporation has been widely used in seawater desalination and other fields due to its advantages of being green and non-polluting, and high energy utilization continuity. It has become an emerging way to purify water and solve water shortages, especially in remote areas. Small-scale domestic water use such as islands, islands, etc. provides a feasible solution. [0003] The currently proposed solar photothermal conversion interface evaporation structure is mainly a two-dimensional planar photothermal structure with a very thin thickness. It is usually directly suspended or floated on the surface of seawater for p...

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Problems solved by technology

However, the current three-dimensional photothermal evaporation structure is usually designed separately from the absorber and the water supply channel. The water supply channel only transports water to a certain point of the photothermal absorber, and then relies on the hydrophilic properties of the surface of the light absorbing layer to gradually wet the entire absorption. layer, prone to problems such as low water collection capacity and insufficient water supply

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