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A three-dimensional modified graphene airgel and its preparation and application in water treatment

A graphene aerogel, three-dimensional technology, applied in graphene, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of difficult biodegradation, secondary pollution, inefficient photothermal conversion, etc. The effect of recycling, reducing heat loss, and large specific surface area

Active Publication Date: 2020-12-11
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a clean and sustainable energy source, solar energy can be used as an energy source for the desalination of high-salinity water bodies. In recent years, the concept of interface-type photo-steam conversion has been proposed, and its photo-steam conversion efficiency can reach 80%, which improves the desalination of high-salinity water bodies by solar energy. There are problems such as high heat loss and low efficiency of light-to-heat conversion during collective heating, but this process is still limited by the optical absorption of the material itself, water transportation, etc.; and high-salt wastewater contains many toxic, difficult to biodegrade, volatile The organic pollutants in the photothermal evaporation process may be accompanied by water evaporation and cause secondary pollution

Method used

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  • A three-dimensional modified graphene airgel and its preparation and application in water treatment
  • A three-dimensional modified graphene airgel and its preparation and application in water treatment
  • A three-dimensional modified graphene airgel and its preparation and application in water treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Preparation of h-CN nanowires

[0037] 20g of urea was placed in a crucible, at 4 ℃ / min was heated to 550 deg.] C, under an air atmosphere maintained at 550 deg.] C calcined stamped 2h, allowed to cool down to room temperature, a pale yellow powder; 0.1g resulting calcined powder was weighed, added 60mL 5M NaOH solution, ultrasonic dispersion 30min, then placed in a water bath was heated with stirring at 60 ℃ 12h; after completion of the reaction, the resultant solution was centrifuged 5min 12000rpm milky substance after repeated 2 or 3 times washed with ultrapure water, the resulting precipitate was freeze-dried h-CN nanowire obtained powder.

[0038] (2) Preparation dimensional h-CN / r-GO Composite

[0039]Weigh 0.06g h-CN powder and 40mL 6mg / mL GO dispersion, ultrasonic dispersion in a solvent, the above-described aqueous solution was transferred to the autoclave, at 40min before the reaction temperature 100 ℃, temperature was raised to 180 [deg.] C and then inc...

Embodiment 2

[0041] (2) Preparation of h-CN nanowires

[0042] 20g of urea was placed in a crucible, at 4 ℃ / min was heated to 550 deg.] C, under an air atmosphere maintained at 550 deg.] C calcined stamped 2h, allowed to cool down to room temperature, a pale yellow powder; 0.5g resulting calcined powder was weighed, added 50mL 5M NaOH solution, ultrasonic dispersion 30min, then placed in a water bath was heated with stirring at 60 ℃ 12h; after completion of the reaction, the resultant solution was centrifuged 5min 12000rpm milky substance after repeated 2 or 3 times washed with ultrapure water, the resulting precipitate was freeze-dried h-CN nanowire obtained powder.

[0043] (2) Preparation dimensional h-CN / r-GO Composite

[0044] Weigh 0.02g h-CN powder and 20mL 4mg / mL GO dispersion, ultrasonic dispersion in a solvent, the above-described aqueous solution was transferred to the autoclave, at 40min before the reaction temperature 100 ℃, temperature was raised to 180 [deg.] C and then in...

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Abstract

The invention discloses three-dimensional modified graphene aerogel and a preparation method thereof and an application in water treatment. The preparation method comprises the following steps: (1) enabling a precursor of h-CN to be placed in a crucible, capping and calcining in an air atmosphere, setting calcining temperature and time, and naturally cooling to a room temperature, to obtain faintyellow powder; weighing the faint yellow powder obtained by calcining, adding alkaline solution, ultrasonic-dispersing, and placing in a water bath, heating and stirring; and after the reaction, afterwashing a milk white substance obtained by centrifuging the solution in a high speed, freeze-drying an obtained precipitate, to obtain h-CN nanowire powder; and (2) using graphene oxide aqueous dispersion as a precursor, and using the h-CN nanowire powder as a nitrogen doping agent, preparing three-dimensional h-CN / GO hydrogel through a hydrothermal method; and reducing the three-dimensional h-CN / GO hydrogel by using a reducing agent, to obtain the three-dimensional h-CN / r-GO composite aerogel. The prepared graphene aerogel is large in specific surface area, large in pore volume, and excellent in pore channel structure, has strong adsorbability, and is capable of achieving rapid and efficient selective adsorption to polarity and non-polarity organic pollutants.

Description

Technical field [0001] The present invention pertains to ambient photothermal nanomaterials and water treatment technology, and in particular relates to the preparation and application of a new water treatment efficient three-dimensional graphene-modified airgel environment. Background technique [0002] With the rapid development of industry, because of its higher salinity of salt (salinity higher than 5%), containing toxic and bio-refractory and other properties it is considered to be a major difficulty of the current water treatment. For such waste water, is mainly concentrated by evaporation method, biological treatment and incineration and the like, e.g., CN 109879507A the Chinese Patent Application discloses a process for coking wastewater high salt resource utilization, the process sequence for coking wastewater high salt It was evaporated, burning, flue gas treatment, the dissolving and removing impurities mixed salts, salts freezing points, two evaporation steps. However...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C01B32/194C01B21/082B82Y40/00B82Y30/00B01J20/20B01J20/28C02F1/28C02F101/30
CPCB01J20/20B01J20/28047B82Y30/00B82Y40/00C01B21/0605C01P2004/16C01P2004/64C01P2004/80C02F1/283C02F2101/30C01B32/184C01B32/194
Inventor 徐颖峰黄乐冯华军沈东升郭乔琪汪婧应贤斌汪锐
Owner ZHEJIANG GONGSHANG UNIVERSITY