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Self-water-supply type photo-thermal water evaporation device based on composite hydrogel

A composite hydrogel and photothermal technology, applied in the direction of carbon compounds, molybdenum sulfide, inorganic chemistry, etc., can solve the antifouling performance of photothermal systems, resistance to salting out pollution and biological pollution, hot spots without a large number of dispersion and thermal stability Insufficiency, deficiency and other problems, to achieve the stability of anti-bacterial biofouling performance, high-efficiency seawater desalination, and reduce the effect of evaporation enthalpy

Active Publication Date: 2021-04-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a pure inorganic composite hydrogel-based self-supply light and hot water evaporation device, which overcomes the time-consuming and energy-consuming preparation of graphene-based composite gels in the prior art, and does not have a large amount of dispersion. Hot spots and poor thermal stability, as well as insufficient antifouling properties of photothermal systems (including anti-salting-out pollution and biological pollution) defects

Method used

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  • Self-water-supply type photo-thermal water evaporation device based on composite hydrogel
  • Self-water-supply type photo-thermal water evaporation device based on composite hydrogel
  • Self-water-supply type photo-thermal water evaporation device based on composite hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add 17 μL of 1 mol / L L-ascorbic acid to the graphene oxide solution (2 mg / mL, 1 mL), sonicate for about 10 min and then place it in an oven at 90 °C for 2 h to react. The obtained GH hydrogel is washed in deionized water, and the The corresponding airgel (GA) can be obtained by freeze-drying.

[0050] Add 4 mg of molybdenum disulfide to a solution containing 1 mL of 2 mg / mL graphene oxide, and process it with ultrasound for about 30 minutes to obtain a homogeneous mixture, then add 17 μL of 1 mol / L L-ascorbic acid, and put it in an oven at 90 ° C after ultrasound for about 10 minutes Standing in the middle for 2h, the obtained MoS 2 The @GH composite hydrogel was washed in deionized water and freeze-dried to obtain the corresponding airgel (MoS 2 @GA) spare.

[0051] Such as figure 2 Shown is the SEM (A) of the simple graphene hydrogel (GH) that the embodiment of the present invention provides, MoS 2 SEM (B), TEM (C, D), STEM (E-I) and XPS patterns (J-L) of @GH com...

Embodiment 2

[0053] Add 17 μL of 1 mol / L L-ascorbic acid to the graphene oxide solution (2 mg / mL, 1 mL), sonicate for about 10 min and then place it in an oven at 90 °C for 2 h to react. The obtained GH hydrogel is washed in deionized water, and the The corresponding airgel (GA) can be obtained by freeze-drying.

[0054] Add 8 mg of molybdenum disulfide to a solution containing 1 mL of 2 mg / mL graphene oxide, and process it with ultrasound for about 30 minutes to obtain a homogeneous mixture, then add 17 μL of 1 mol / L L-ascorbic acid, and put it in an oven at 90 ° C after ultrasound for about 10 minutes Standing in the middle for 2h, the obtained MoS 2 The @GH composite hydrogel was washed in deionized water and freeze-dried to obtain the corresponding airgel (MoS 2 @GA) spare.

[0055] Such as image 3 Shown is the MoS provided by the embodiment of the present invention 2 The optical spectrum (A), DSC curve (B) and infrared thermal image (C) of @GH composite hydrogel compared with pur...

Embodiment 3

[0057] Add 16mg of molybdenum disulfide to a solution containing 1mL of 2 mg / mL graphene oxide, and process it with ultrasound for about 60 minutes to obtain a uniform mixture, then add 17μL of 1 mol / L L-ascorbic acid, and put it in an oven at 90°C after ultrasound for about 10 minutes Standing in the middle for 2h, the obtained MoS 2 @GH composite hydrogel was washed in deionized water for later use.

[0058] Put a certain amount of blank water or NaCl solution into two beakers (25mL) to set different liquid level differences (-6mm, 0mm, 6mm, 12mm and 18mm and salt concentration differences (3.5%-0%, 3.5%-3.5 %, 3.5%–10%, 3.5%–18% and 3.5%–26% (such as the NaCl solution with a mass concentration of 3.5% in the left beaker, and the NaCl solution with a mass concentration of 26% in the right beaker, that is 3.5%–26% group), cotton gauze was used as the capillary water absorption medium, and it was constructed on two beakers to realize the rapid transfer of water and obtain a sui...

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Abstract

The invention relates to a composite hydrogel-based self-water-supply type photo-thermal water evaporation device. Porous molybdenum disulfide MoS2 nano particles are intercalated between graphene through a one-step chemical reduction reaction. The efficient water evaporation rate of 3.2 kg m<-2>h<-1> can be achieved under illumination of 0.9 kW m<-2> and is far higher than that of an existing photo-thermal interface water evaporation system of the same type, and the device has bacterial biological pollution resistance and good stability. The provided photo-thermal interface water evaporation system is expected to realize efficient seawater desalination, and provides a solution for sustainable clean water production.

Description

technical field [0001] The invention belongs to the field of photothermal materials, in particular to a composite hydrogel-based self-supply photothermal water evaporation device. Background technique [0002] Solar-driven interfacial water evaporation is considered to be the most promising approach to alleviate freshwater scarcity due to its excellent evaporation performance and thermal management. To maximize evaporation efficiency, various photothermal materials (plasmonic nanoparticles, carbon-based nanomaterials, semiconductors, etc.) and interfaces (self-supporting films, bilayer films, artificial transpiration systems, etc.) have been used to harvest solar energy and Reduce heat loss. Among them, hydrogel-based solar evaporation systems have received extensive attention because the hydrogel network contains a large amount of intermediate water, which can activate water molecules and accelerate water evaporation with a small amount of energy. [0003] However, most o...

Claims

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Application Information

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IPC IPC(8): C01B32/194C01G39/06
CPCC01B32/194C01G39/06Y02A20/124Y02A20/212
Inventor 王义李亚玲
Owner DONGHUA UNIV
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