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Preparation method of double-layer integral photo-thermal conversion material

A light-to-heat conversion, integrated technology, applied in the preparation/purification of carbon, drying solid materials without heating, drying solid materials, etc., can solve the problems of reducing the life cycle of materials and reducing the evaporation efficiency of materials

Active Publication Date: 2021-05-14
NANUS NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual evaporation environment, there are different acid-base and sewage environments, and this condition will greatly reduce the service life of the material and reduce the evaporation efficiency of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 80 parts of water, 3 parts of chitosan, and 1 part of acetic acid and stir them evenly with a mixer, wherein the degree of deacetylation of chitosan is 85%, add 0.03 parts of glutaraldehyde, and then stir them evenly with a mixer. Then the material was subjected to directional cryogenic freezing with liquid nitrogen, and the material was frozen for 1 hour and then freeze-dried; the drying temperature was -50° C., and the air pressure was 0.01 mbar. Chitosan airgel dried for 48 hours was placed on a steel plate at 300°C for 10 minutes of carbonization, and the volume ratio of chitosan base layer / in-situ carbonization layer was 5:1. Finally, the carbonized airgel is cooled and dried to obtain the chitosan / in-situ carbonized water evaporation purification filter material. The prepared material was subjected to a salt water photothermal evaporation experiment under a xenon lamp. The salt content of the salt water was 20%, and the water evaporation rate was measured to ...

Embodiment 2

[0021] Take 90 parts of water, 4 parts of chitosan, and 1 part of acetic acid and stir them evenly with a mixer, wherein the degree of deacetylation of chitosan is 95%, add 0.2 parts of epichlorohydrin and then stir them evenly with a mixer. Then use dry ice to carry out directional low-temperature freezing on the material, and freeze the material for 2 hours before freeze-drying; the drying temperature is -40°C, and the air pressure is 0.1mbar. The chitosan airgel after drying for 72 hours was placed on a steel plate at 325°C for 15 minutes of carbonization, and the volume ratio of chitosan base layer / in-situ carbonization layer was 5:2. Finally, the carbonized airgel is cooled and dried to obtain the chitosan / in-situ carbonized water evaporation purification filter material. The prepared material was subjected to a sewage photothermal evaporation experiment under a xenon lamp. The slurry content of the sewage was 20%, and the measured water evaporation rate was 1.54kg m 2 ...

Embodiment 3

[0023] Take 95 parts of water, 4 parts of chitosan and 1 part of acetic acid and stir them evenly with a mixer, wherein the degree of deacetylation of chitosan is 85%, add 0.3 parts of N-hydroxysuccinimide and then stir them evenly with a mixer. Then, the material was subjected to directional low-temperature freezing with liquid oxygen, and the material was frozen for 3 hours and then freeze-dried; the drying temperature was -40°C, and the air pressure was 0.5mbar. Chitosan airgel dried for 96 hours was placed on a steel plate at 350°C for 20 minutes of carbonization, and the volume ratio of chitosan base layer / in-situ carbonization layer was 4:2. Finally, the carbonized airgel is cooled and dried to obtain the chitosan / in-situ carbonized water evaporation purification filter material. The prepared material was subjected to an acid water photothermal evaporation experiment under a xenon lamp. The acid water was a hydrogen chloride solution with a pH value of 1-2, the concentra...

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Abstract

The invention discloses a preparation method of a double-layer integral photo-thermal conversion material. The preparation method comprises the following steps: performing low-temperature freezing and freeze drying on raw materials water, chitosan, acetic acid and a cross-linking agent in proportion to obtain a chitosan matrix with a vertical pore structure; carrying out high-temperature carbonization to obtain in-situ carbonized chitosan aerogel; and performing cooling and drying to obtain the double-layer integral photo-thermal conversion material. An integral chitosan / in-situ carbonized double-layer structure is adopted in the structure, a chitosan base body contains rich vertical hole structures, the evaporation efficiency is high, the photothermal conversion rate is high, the function that a conventional solar evaporator provides phase water for an upper-layer absorber and provides sufficient water can be achieved, and the function that the conventional solar evaporator provides phase water for the lower-layer absorber can be achieved; meanwhile, an efficient evaporation function can be realized by means of in-situ carbonization. The water purification evaporation material prepared by the method disclosed by the invention is simple in process, low in cost and excellent in performance, not only can effectively purify saline water and adsorb harmful substances in water, but also has antifouling and salt-resistant self-cleaning functions, and effectively improves the water cleanliness.

Description

technical field [0001] The invention relates to the field of solar photothermal conversion, in particular to a preparation method of a double-layer integrated photothermal conversion material. Background technique [0002] With the development and progress of science and technology, the scope of human activities is getting wider and wider, and the living standard is getting higher and higher. While people achieve positive results in nature, nature also brings negative effects to people. The natural environment and people's living environment deteriorating day by day, the problem of shortage of fresh water resources has become more prominent. Whether solar energy, the cleanest energy, can be efficiently used to produce clean water resources has attracted the attention of many scholars. Among them, good photothermal materials have a wide range of light absorption, high photothermal conversion efficiency, and low cost. A research hotspot in the field of thermal conversion, pho...

Claims

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Application Information

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IPC IPC(8): C01B32/05F24S70/10F26B5/06
CPCC01B32/05F24S70/10F26B5/06Y02E10/40Y02A20/212
Inventor 陈苏刘智武朱亮亮
Owner NANUS NEW MATERIAL
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