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A graphene sponge for heavy metal enrichment or removal of pollutants in water and preparation method thereof

A graphene sponge, water removal technology, applied in the directions of alkali metal compounds, alkali metal oxides/hydroxides, water/sewage treatment, etc., can solve the problems of flexible structure changes, affecting adsorption performance, material micropore blockage, etc. Achieve stable performance, increase adsorption capacity, and no secondary pollution.

Active Publication Date: 2017-10-20
INSTITUTE OF ANALYSIS GUANGDONG ACADEMY OF SCIENCES (CHINA NATIONAL ANALYTICAL CENTER GUANGZHOU)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as an adsorption material, there are certain defects in practical applications. Graphene has a two-dimensional sheet structure, which can easily lead to changes in its flexible structure during the adsorption process of the target substance, and blockage of micropores inside the material, resulting in a decrease in its specific surface area and affecting the adsorption performance. , and it is not easy to separate solid and liquid, so its structure must be improved in practical application

Method used

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  • A graphene sponge for heavy metal enrichment or removal of pollutants in water and preparation method thereof
  • A graphene sponge for heavy metal enrichment or removal of pollutants in water and preparation method thereof
  • A graphene sponge for heavy metal enrichment or removal of pollutants in water and preparation method thereof

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Effect test

Embodiment 1

[0030] Embodiment 1: the preparation of the graphene sponge that is used for heavy metal enrichment

[0031] 1. Preparation of Graphene Oxide Solution

[0032] Prepare graphene oxide by the method of Hummer's, specifically 10g graphene is joined in the flask that 500mL vitriol oil / concentrated nitric acid (volume ratio 10 / 1) is housed, slowly add 22g potassium permanganate again under stirring, stir Mix well, cool down, and react at 50°C for 10 hours, add 500mL water and 8mL hydrogen peroxide with a mass fraction of 30% in an ice bath, let stand for 2 hours, then centrifuge with water, 30% hydrochloric acid, water, and ethanol in sequence Wash and dry to obtain graphene oxide.

[0033] Add ionized water to the graphene oxide prepared above, disperse it uniformly by ultrasonication for 1 hour, and prepare a 5 mg / mL graphene oxide aqueous solution.

[0034] 2. Preparation of graphene sponge

[0035] Take five test tubes, add 2 mL of the 5 mg / mL graphene oxide solution obtaine...

Embodiment 2

[0036] The application of embodiment 2 graphene sponge in absorbing organic matter in water

[0037]Take five test tubes, respectively prepare 10 mL of reaction solution with graphene oxide concentration of 4.0 mg / mL and sodium alginate concentration of 2 mg / mL, and ultrasonically mix the graphene oxide and sodium alginate solutions, and add sodium bicarbonate solution to adjust the pH to 10, sonicate for 30 minutes, and then put the five test tubes into a 150°C water bath and heat them for 0.5, 2.5, 5.0, 7.5 and 10 hours respectively. After heating, cool and add 500uL 1M calcium chloride solution under stirring to obtain a shaped water-containing graphene sponge. Wash the shaped water-containing graphene sponge with hydrochloric acid and water respectively, and then freeze-dry for 8 hours to obtain five different reaction times. Under the graphene sponge. Add 10 mg of graphene sponges under the above five different reaction times into five containers containing 100 mL of 10 ...

Embodiment 3

[0038] The application of embodiment 3 graphene sponge in adsorption heavy metal ion

[0039] Take five test tubes, respectively prepare 10 mL of reaction solution with graphene oxide concentration of 2.0 mg / mL and sodium alginate concentration of 4 mg / mL, and ultrasonically mix the graphene oxide and sodium alginate solutions, and add sodium bicarbonate solution to adjust the pH to 10, sonicate for 1 hour, and then heat the five test tubes in water baths at 60, 90, 100, 120 and 150°C for 3 hours. After heating, cool and add 500uL 1M calcium chloride solution under stirring to obtain a shaped water-containing graphene sponge. Wash the shaped water-containing graphene sponge with hydrochloric acid and water respectively, and then freeze-dry for 8 hours to obtain five different reaction temperatures. Under the graphene sponge. 10mg of graphene sponges at the above five different reaction temperatures were added to the five to contain Pb 2+ 、Cd 2+ , Hg 2+ and As 3+ (Concentr...

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Abstract

The invention discloses a graphene sponge used for enriching heavy metals or removing pollutants in water and a preparation method thereof. The graphene oxide and sodium alginate solutions with a mass ratio of 1:0.1 to 1:10 are ultrasonically mixed, Then add alkaline substances to adjust the pH to 8-10; seal and heat at 60-150°C for 0.5-10 hours to obtain graphene hydrogel; add calcium ion solution to the obtained graphene hydrogel, soak and wash with acid and water respectively, Then dry to get the target product. The graphene sponge of the present invention has a simple preparation process, simpler raw material components, is easy to obtain, has no secondary pollution, is easy to popularize and can be mass-produced. Moreover, the prepared graphene sponge is more porous and has a larger specific surface area, which increases the adsorption capacity for pollutants. The problem of difficult solid-liquid separation of the nano-adsorbent is solved. It can be used to adsorb organic pollutants and heavy metal ions in water, and can also be used to enrich trace heavy metals in water.

Description

Technical field: [0001] The invention relates to the technical field of functional materials, in particular to a graphene sponge used for enriching heavy metals or removing pollutants in water and a preparation method thereof. Background technique: [0002] At present, water pollution has attracted more and more people's attention. The heavy metals in the water are difficult to degrade and will accumulate in the human body along with the ecological cycle, thus endangering human health. Therefore, it is very important to remove and detect heavy metals in water. How to quickly and efficiently remove heavy metal ions in water, and how to enrich and detect trace heavy metals in water has become a major topic in the research of water pollution control. [0003] Graphene is an emerging material with a high specific surface area, and its theoretical specific surface area is as high as 2630m 2 / g. It has potential application performance in adsorption enrichment. However, as an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/62C02F1/58
Inventor 周巧丽雷永乾郭鹏然王冠华潘佳钏
Owner INSTITUTE OF ANALYSIS GUANGDONG ACADEMY OF SCIENCES (CHINA NATIONAL ANALYTICAL CENTER GUANGZHOU)
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