Cleaning water drawing method using hydrophilic compression resistant aerogel as forward osmosis drawing substance

A compressed gas, forward osmosis technology, applied in the fields of environmental engineering, military and emergency disaster relief, can solve the problems of complex energy consumption in the reverse osmosis regeneration process of the drawn liquid, restricting the wide application and development, and limited audience, so as to simplify the regeneration and Process conditions for water production, good hydrophilicity and easy modification, and the effect of avoiding reverse osmosis

Active Publication Date: 2017-04-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although forward osmosis technology has attracted much attention, key issues such as draw liquid reverse osmosis and complex energy consumption in the regeneration process still restrict its wide application and development.
At present, the draw solutions that have been widely studied, such as inorganic salts, natural macromolecules, synthetic macromolecules, hydrogels, polyelectrolytes, and magnetic nanoparticles, cannot solve the complex energy consumption of the reverse osmosis and regeneration processes of the draw solution. The problem
Thermosensitive, electrosensitive and other stimuli-responsive hydrogels are used as the drawing solution. Although reverse osmosis can be completely avoided, the regeneration process still has problems such as long time-consuming and high energy consumption.
The hydration bag uses edible solutes such as glucose, fructose, and concentrated fruit juice as the extraction material, but the produced water contains sugar, so the audience is limited, and the extraction material is for one-time use and needs to be replaced frequently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of sodium alginate-graphene oxide airgel: Take 200ml of 2wt% sodium alginate aqueous solution into a 500mL beaker, stir, add 50mg of GO, and sonicate for 2h. After the solution is mixed evenly, add 29mL of 0.24mol / L CaCl 2 The aqueous solution, after being uniformly mixed, is poured into a mold and left to stand at room temperature for 24 hours. Afterwards, the hydrogel was taken out, placed in deionized water, left standing at room temperature, and deionized water was replaced every 3 hours, and repeated until the conductivity of the deionized water after replacement did not increase significantly. Put the replaced hydrogel in a -25°C refrigerator for pre-freezing treatment for 2 hours (depending on the volume of the hydrogel, subject to the overall solidification), and then freeze-dry for 48 hours. The freeze-drying temperature was -90°C. After the freeze-drying is finished, a hydrophilic and recompressible aerogel is obtained.

[0018] Seawater desalin...

Embodiment 2

[0021] Sodium alginate-graphene oxide airgel preparation: Take 400ml of 2wt% sodium alginate aqueous solution into a 1000mL beaker, stir, add 100mg GO, and sonicate for 4h. After the solution is mixed evenly, add 58mL 0.24mol / L CaCl 2 The aqueous solution, after being uniformly mixed, is poured into a mold and left to stand at room temperature for 48 hours. Afterwards, the hydrogel was taken out, placed in deionized water, left standing at room temperature, and deionized water was replaced every 3 hours, and repeated until the conductivity of the deionized water after replacement did not increase significantly. Put the replaced hydrogel in a refrigerator at -25°C for pre-freezing treatment for 4 hours (depending on the volume of the hydrogel, subject to the overall solidification), and then freeze-drying, the freeze-drying time is 48 hours, The freeze-drying temperature was -90°C. After the freeze-drying is finished, a hydrophilic and recompressible aerogel is obtained.

[...

Embodiment 3

[0025] Preparation of sodium alginate-graphene oxide airgel: Take 2000ml of 2wt% sodium alginate aqueous solution into a 5000mL beaker, stir, add 500mg of GO, and sonicate for 4h. After the solution is mixed evenly, add 290mL0.24mol / L CaCl 2 The aqueous solution, after being uniformly mixed, is poured into a mold and left to stand at room temperature for 48 hours. Afterwards, the hydrogel was taken out, placed in deionized water, left standing at room temperature, and deionized water was replaced every 3 hours, and repeated until the conductivity of the deionized water after replacement did not increase significantly. Put the replaced hydrogel in a refrigerator at -25°C for pre-freezing treatment for 4 hours (depending on the volume of the hydrogel, subject to the overall solidification), and then freeze-drying, the freeze-drying time is 48 hours, The freeze-drying temperature was -90°C. After the freeze-drying is finished, a hydrophilic and recompressible aerogel is obtaine...

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PUM

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Abstract

The invention provides a cleaning water drawing method using hydrophilic compression resistant aerogel as a forward osmosis drawing substance, and belongs to the technical field of environmental pollution control engineering. The hydrophlic compression resistant aerogel is used as the forward osmosis drawing substance in the forward osmosis process for optimizing the forward osmosis water drawing and water regeneration processes, thus enhancing the performance of the forward osmosis technology. Due to the structural features, the hydrophilic compression resistant aerogel can completely prevent reverse osmosis of salt, and at the same time keep a high water flux. Moreover, no complex and energy-consuming physical or chemical methods are used for the regeneration of the drawing substance. Mere manual compression is enough to complete the water regeneration and production. At the same time, the materials can be widely sourced with low price. The reaction condition is mild. The toxicity is low. The membrane compatibility is good. The cleaning water drawing method is particularly suitable for drawing solution in portable water cleaning devices in the fields of military applications and emergency disaster relief and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to the research on using hydrophilic and compression-resistant aerogels as forward osmosis extracts to draw clean water, and in particular to the innovation of extracts in portable water-absorbing devices used in military and emergency relief and other fields . Background technique [0002] Forward osmosis is a physical phenomenon, that is, the process of water passing through a selective semi-permeable membrane spontaneously from the area with high water chemical potential (low osmotic pressure side) to the low water chemical potential area (high osmotic pressure side). The phenomenon can be used to extract drinking water from sewage or seawater. Compared with membrane filtration technologies such as microfiltration, ultrafiltration, nanofiltration and reverse osmosis that have been widely used, forward osmosis technology has high desalination ability, does not req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44
CPCC02F1/445
Inventor 张捍民于明川
Owner DALIAN UNIV OF TECH
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