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Light-absorbing heat-insulating integrated photothermal evaporation material as well as preparation method and application thereof

An insulator, photothermal technology, applied in the field of solar photothermal utilization, can solve the problems of reducing the mechanical stability of the system, decreasing the thermal insulation performance, increasing the heat dissipation loss, etc., and achieving the effect of overcoming the problem of easy detachment and improving the stability.

Active Publication Date: 2019-08-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the reported local heating system, there are two problems: (1) The local heating system is a double-layer structure composed of light absorbers directly stacked on the upper surface of the heat insulator. In the actual evaporation process, the upper layer The absorber is easy to detach from the lower heat insulator, causing the gap between the two to be filled with the liquid to be evaporated, and the heat insulation performance of the system is weakened; moreover, the detachment of the light absorber and the heat insulator will reduce the mechanical stability of the system, which will not Conducive to the long-term operation of the system
(2) The liquid to be evaporated is transferred to the surface of the upper light absorber through the interior of the lower heat insulator and exchanged heat; the liquid with high thermal conductivity (such as water, its thermal conductivity is: 0.6W m -1 K -1 ) entering the interior of the heat insulator will lead to a decrease in its heat insulation performance, which will increase the heat dissipation loss during operation and reduce the light-to-heat conversion efficiency

Method used

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  • Light-absorbing heat-insulating integrated photothermal evaporation material as well as preparation method and application thereof
  • Light-absorbing heat-insulating integrated photothermal evaporation material as well as preparation method and application thereof
  • Light-absorbing heat-insulating integrated photothermal evaporation material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] 1. configure graphene oxide aqueous solution, wherein the concentration of graphene oxide is 4g L -1 , the concentration of sodium tetraborate decahydrate is 1mmol L -1 , the concentration of ethylenediamine is 4mmol L -1 ;

[0069] 2. The prepared graphene oxide aqueous solution was transferred to a Teflon high-temperature and high-pressure reactor, maintained at 90°C for 6 hours, then maintained at 120°C for 6 hours, and finally cooled to room temperature to obtain a graphene hydrogel;

[0070] 3. Soak the obtained graphene hydrogel with ethanol aqueous solution for 6h, wherein the volume fraction of ethanol is 10%, the purpose is to clean the residual additives on the surface of the graphene hydrogel;

[0071] 4. Transfer the cleaned graphene hydrogel to a freezing chamber with a temperature of -80°C, freeze for 6 hours, then transfer to a drying chamber with a temperature of 0°C and an air pressure of <650Pa, and vacuum dry for 6 hours to obtain a graphene foam; ...

Embodiment 2

[0083] 1. configure graphene oxide aqueous solution, wherein the concentration of graphene oxide is 5g L -1 , the concentration of sodium tetraborate decahydrate is 2mmol L -1 , the concentration of ethylenediamine is 8mmol L -1 ;

[0084] 2. The prepared graphene oxide aqueous solution was transferred to a Teflon high-temperature and high-pressure reactor, maintained at 120°C for 12 hours, and then cooled to room temperature to obtain a graphene hydrogel;

[0085] 3. soak the obtained graphene hydrogel with ethanol aqueous solution for 12h, wherein the volume fraction of ethanol is 20%, the purpose is to clean the residual additives on the surface of the graphene hydrogel;

[0086] 4. Transfer the cleaned graphene hydrogel to a freezing chamber with a temperature of -60°C, freeze for 12 hours, then transfer to a drying chamber with a temperature of -10°C and an air pressure of <650Pa, and vacuum dry for 12 hours to obtain a graphene foam;

[0087] 5. Place the obtained gra...

Embodiment 3

[0094] 1. configure graphene oxide aqueous solution, wherein the concentration of graphene oxide is 5g L -1 , the concentration of sodium tetraborate decahydrate is 3mmol L -1 , the concentration of ethylenediamine is 12mmol L -1 ;

[0095] 2. The prepared graphene oxide aqueous solution was transferred to a Teflon high-temperature and high-pressure reactor, maintained at 90°C for 6 hours, then maintained at 180°C for 6 hours, and finally cooled to room temperature to obtain a graphene hydrogel;

[0096] 3. soak the obtained graphene hydrogel with ethanol aqueous solution for 18h, wherein the volume fraction of ethanol is 20%, the purpose is to clean the residual additives on the surface of the graphene hydrogel;

[0097] 4. Transfer the cleaned graphene hydrogel to a freezing chamber with a temperature of -40°C, freeze for 18 hours, then transfer to a drying chamber with a temperature of -10°C and an air pressure of <650Pa, and dry it in vacuum for 24 hours to obtain a grap...

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Abstract

The invention aims to provide a light-absorbing heat-insulating integrated photothermal evaporation material. The light-absorbing heat-insulating integrated photothermal evaporation material comprisesa heat-insulating body and a light-absorbing body covering the outer surface of the heat-insulating body; and the light-absorbing body is vertically-oriented graphene of which the surface is modifiedby a hydrophilic functional group, the heat-insulating body is graphene foam, and the vertically-oriented graphene is connected with the graphene foam through a covalent bond. The integrated photothermal evaporation material provided by the invention overcomes the problems of easy separation of a light-absorbing body and a heat-insulating body and heat loss caused by penetration of a liquid intothe heat-insulating body, improves stability and photothermal conversion efficiency of a local heating system, realizes fast and high-efficiency photothermal evaporation, has a simple preparation process, is easy to produce in a large scale, and can be applied to seawater desalination, sewage purification and high-temperature steam sterilization.

Description

technical field [0001] The invention belongs to the field of solar photothermal utilization, and in particular relates to a light-absorbing and heat-insulating integrated photothermal evaporation material and its preparation method and application. Background technique [0002] Solar energy is the energy source with the widest distribution and largest reserves on the earth. Because of its clean and renewable characteristics, it has received the most extensive attention in the 21st century when energy crisis and environmental problems are becoming more and more serious. Photothermal conversion is one of the most important forms of utilization of solar energy. How to realize photothermal conversion of solar energy efficiently and at low cost, and effectively utilize the converted heat energy, is becoming a current international research hotspot[V.H.Dalvi1 et al.Nat, Clim .Change 2015,5:1007-1013]. [0003] In 2014, the research group of Gang Chen from the Massachusetts Instit...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/194C01B32/186A61L2/07C02F1/14C02F103/08
CPCA61L2/07C01B32/184C01B32/186C01B32/194C01B2204/24C02F1/048C02F1/14C02F2103/08Y02A20/124Y02A20/142Y02A20/212
Inventor 薄拯杨化超吴声豪严建华岑可法
Owner ZHEJIANG UNIV
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