Double-sided photo-thermal conversion material and solar seawater evaporation device constructed by same

Abstract

The invention relates to a double-sided photo-thermal conversion material and a solar seawater evaporation device constructed by the same. The double-sided photo-thermal conversion material has a composite layer (more than two layers) structure, and the upper and lower layers are hydrophilic photo-thermal conversion materials. The device is composed of the double-sided photo-thermal conversion material (with a three-layer composite structure, the lower layer is completely immersed in seawater, and the upper layer is located above the water surface), a water tank (containing seawater), a waterlevel adjusting mechanism (capable of adjusting the height of the water surface) and a turnover mechanism (capable of intermittently driving the double-sided material to turn over up and down). Alternatively, the device is composed of a conveyor belt (which is a hydrophilic photo-thermal conversion material with a double-layer composite structure and is distributed into three parts, namely, a partbelow the water surface, a part above the water surface and a part outside the water tank), a water tank, a water level adjusting mechanism, a supporting mechanism (capable of supporting the conveyorbelt) and a driving mechanism (capable of continuously driving the conveyor belt to work). The problems that in the prior art, salt particles separated out of the surface of a hot layer are not removed in time, consumed time is long, and cost is high are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and relates to a double-sided photothermal conversion material and a solar seawater evaporation device constructed by it, in particular to a device comprising at least two upper and lower layers, both of which are hydrophilic photothermal conversion materials. A double-sided light-to-heat conversion material, and a solar seawater evaporation device for intermittently or continuously realizing anti-salt precipitation. Background technique [0002] Billions of people around the world are suffering from fresh water shortages, while seawater covers 70% of the earth, developing an environmentally friendly desalination technology is crucial to meet the growing demand for fresh water. Many technologies have been developed for desalination of seawater, including reverse osmosis, seawater distillation, electrodialysis, multiple-effect evaporation, and seawater freezing. [0003] Among the a...

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Problems solved by technology

However, this method will cause the salt in the seawater to precipitate on the surface of the heat-generating layer, covering the light-receiving surface and blocking its gaps, resulting in the failure of the light-to-heat conversion layer.

In 2009, a dyed cotton fabric based on carbon nanotubes was synthesized for photothermal seawater desalination (Koua H, Liu Z X, et al. Recyclable CNT-coupl...

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