Efficient and stable novel photo-thermal water evaporation material with self-cleaning function and preparation method thereof

A self-cleaning, new type of technology, applied in general water supply conservation, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as easy loss of water vapor, difficult to clean heat, easy loss of surface, etc., to facilitate daily management, reduce Effect of heat loss and life extension

Active Publication Date: 2021-09-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of easy surface loss, difficulty in cleaning, easy loss of heat and difficulty in collecting water vapor in the existing photothermal evaporation device, the present invention proposes a new photothermal water evaporation material with high efficiency, stability and self-cleaning function and its preparation method

Method used

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  • Efficient and stable novel photo-thermal water evaporation material with self-cleaning function and preparation method thereof
  • Efficient and stable novel photo-thermal water evaporation material with self-cleaning function and preparation method thereof
  • Efficient and stable novel photo-thermal water evaporation material with self-cleaning function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Preparation of new photothermal and hot water evaporation materials with high efficiency, stability and self-cleaning function

[0037] 1) Select a hydrophilic non-woven fabric with a thickness of 200 μm, cut it into a disc with a diameter of 3 cm, ultrasonicate it in ethanol at a frequency of 30 kHz for 5 minutes, then replace the ethanol with deionized water, and use the same frequency Sonicate for 5 minutes, and wash three times with repeated water changes. Take out the material, put it in an oven at 60°C for 6 hours to dry, and obtain the bottom layer of the water-absorbent material;

[0038] 2) Weigh 20 mg of carbon nanotube powder, disperse in 3 ml of ethanol solution, and ultrasonically disperse at a frequency of 30 kHz for 15 min to obtain a suspension;

[0039] 3) Evenly drop the suspension obtained in step (2) onto the bottom layer of the water-absorbing material obtained in step (1), and add dropwise in 4 times. After each drop, put it in an oven at 50°C ...

Embodiment 2

[0050] With embodiment 1, but the scraping film thickness is 150 μ m, adopts Figure 5 The light and hot water evaporation device shown is tested under the irradiation of twice the intensity of sunlight, and the relationship between the amount of water evaporation and the illumination time is obtained. In addition, the photothermal materials with and without the PDMS protective layer were washed with water for 7 times, and the photothermal water evaporation test was carried out after each washing.

[0051] Figure 9 The relationship between evaporation rate and time of pure water, photothermal material without PDMS protective layer and photothermal material with PDMS protective layer under the irradiation of twice the intensity of sunlight. It can be seen from the comparison that with or without PDMS protective layer The water evaporation efficiency of the photothermal materials is not much different before being washed by water, which is about 4 times the evaporation efficie...

Embodiment 3

[0054] Same as Example 1, but the scraping film thickness is 250 μm. The obtained light-to-heat conversion material is used for Figure 11 The device shown is closed for fresh water collection, and fresh water collection can be carried out without affecting the light intensity.

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Abstract

The invention discloses an efficient and stable novel photo-thermal water evaporation material with a self-cleaning function and a preparation method thereof. The photo-thermal water evaporation material comprises a polydimethylsiloxane (PDMS) top layer, a photo-thermal material middle layer and a water absorption material bottom layer, wherein the polydimethylsiloxane (PDMS) top layer plays a role in protection, the photo-thermal material middle layer converts light energy into heat energy, and the water absorption material bottom layer conveys water to the photo-thermal material through capillary acting force. The efficient and stable novel photo-thermal water evaporation material with the self-cleaning function has efficient photo-thermal water evaporation capacity and good absorbance, the preparation process is simple, the material is flexible and convenient to carry, repeatability is good, and the material is suitable for large-scale production. In addition, the mode that the water vapor overflows from the lower portion is more beneficial to collection of the water vapor under the condition that illumination is not affected, and the material is suitable for seawater desalination and fresh water purification.

Description

technical field [0001] The invention belongs to the technical field of fresh water collection, and in particular relates to a novel photothermal water evaporation material with high efficiency, stability and self-cleaning function and a preparation method thereof. Background technique [0002] With the development of industry and the deterioration of the environment, the shortage of fresh water resources is becoming more and more serious. As an inexhaustible clean energy, solar energy has attracted extensive research in seawater desalination. At present, there are many kinds of devices for solar thermal evaporation of water, mainly including thin-film structures, self-floating block structures, and 3D three-dimensional structures. Evaporation has been significantly increased through effective thermal management. However, there are three significant problems in the existing photothermal devices: first, the light-absorbing interface will inevitably be polluted if it is expos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/14B32B5/02B32B27/28B32B33/00B32B38/16B32B37/10B32B38/10
CPCC02F1/14B32B5/022B32B27/283B32B33/00B32B38/162B32B38/164B32B37/10B32B38/10B32B2255/02B32B2255/20B32B2307/412B32B2307/73B32B2307/308B32B2307/304Y02A20/212
Inventor 贺高红侯巧李祥村姜晓滨吴雪梅肖武马沧海
Owner DALIAN UNIV OF TECH
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