Graphene sponge used for enriching heavy metals or removing pollutants in water and preparation method of graphene sponge

A graphene sponge, water removal technology, applied in the directions of alkali metal compounds, alkali metal oxides/hydroxides, water/sewage treatment, etc. Increase adsorption capacity, no secondary pollution, stable performance

Active Publication Date: 2015-07-08
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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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, a

Method used

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  • Graphene sponge used for enriching heavy metals or removing pollutants in water and preparation method of graphene sponge
  • Graphene sponge used for enriching heavy metals or removing pollutants in water and preparation method of graphene sponge
  • Graphene sponge used for enriching heavy metals or removing pollutants in water and preparation method of graphene sponge

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Experimental program
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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 of the graphene sponge. The preparation method comprises the following steps: ultrasonically uniformly mixing oxidized graphene and a sodium alginate solution with a mass ratio of 1:0.1-1:10, adding an alkaline substance to adjust a pH value to be 8-10; sealing at the temperature of 60-150 DEG C to perform heating reaction for 0.5h-10h to obtain graphene hydrogel; and adding a calcium ion solution in the obtained graphene hydrogel, washing respectively with acid and water, and then drying to obtain a target product. According to the preparation method, the preparation process is simple, the raw material ingredients are relatively simple and are easily available, secondary pollution is avoided, the popularization is easy, and large-batch production can be performed; the prepared graphene sponge is relatively disperse and porous, and is large in specific surface area so that the adsorption capacity to the pollutants is increased. The problem that solid-liquid separation is difficultly performed by adopting a nanometer adsorbing agent is solved. The graphene sponge can be used for adsorbing organic pollutants and heavy metal ions in water, and can also be used for enriching 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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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 INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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