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Functionalized graphene adsorbent and preparation method and application thereof

An adsorbent and graphene technology, which is applied in the field of nanomaterials and environmental science, can solve the problems of restricting the application of pollutant removal, reducing the specific surface area of ​​graphene, and less application of graphene materials, so as to improve dispersibility and hydrophilicity, The effect of low cost of treatment process and easy control of conditions

Active Publication Date: 2013-03-20
湖南红普创新科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene materials have fewer applications in the environment
Studies have shown that graphene can remove pollutants such as heavy metals, but the agglomeration of graphene not only reduces the specific surface area of ​​graphene, but also is not conducive to dispersion in solution, which limits its application in the removal of pollutants in wastewater

Method used

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  • Functionalized graphene adsorbent and preparation method and application thereof
  • Functionalized graphene adsorbent and preparation method and application thereof
  • Functionalized graphene adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a kind of like figure 2 Shown functionalized graphene adsorbent of the present invention, this functionalized graphene adsorbent is mainly made up of graphene and cetyltrimethylammonium bromide, and this cetyltrimethylammonium bromide passes non- The covalent bond is inserted and / or embedded in the edge or surface of the layered graphene, and the mass fraction of cetyltrimethylammonium bromide in the functionalized graphene adsorbent is 45%.

[0037] The preparation method of the functionalized graphene adsorbent of the present embodiment comprises the following steps.

[0038] 1. Use the modified Hummers method to synthesize graphene oxide. The specific steps are as follows: slowly add 10g of graphite and 5g of sodium nitrate into a flask containing 230ml of concentrated sulfuric acid, and stir in an ice-water mixture. After 30min, slowly add 30g of high manganese During the stirring process, control the reaction temperature to always be less than 15°C and keep it fo...

Embodiment 2

[0045] Utilize the functionalized graphene adsorbent obtained in embodiment 1 to remove chromium in waste water, concrete steps include:

[0046] (1) The functionalized graphene adsorbent of the above-mentioned embodiment 1 is divided into 9 groups, and then added to the chromium-containing wastewater whose initial concentration of chromium is 50ppm, and the consumption of the adsorbent is 0.4g / L;

[0047] (2) Perform oscillation reaction on the above-mentioned groups of wastewater. The pH values ​​of each group of wastewater are 1, 2, 3, 4, 5, 6, 8, 10 and 12 respectively, and the reaction temperature of each group of wastewater is 30°C. The reaction speed is 130rpm, and the shaking reaction time is 40min;

[0048] (3) Use a 0.22 μm filter membrane to filter each group of wastewater after the oscillation reaction to complete the removal of chromium in the wastewater.

[0049] Measure the residual amount of heavy metal chromium in each group of wastewater samples of this embo...

Embodiment 3

[0051] Utilize the functionalized graphene adsorbent obtained in embodiment 1 to remove chromium in waste water, concrete steps include:

[0052] (1) The above functionalized graphene adsorbents were divided into 10 groups, and then added to chromium-containing wastewater with an initial concentration of chromium of 50ppm, and the amount of adsorbents was 0.4g / L;

[0053] (2) Perform oscillation reaction on the above-mentioned groups of wastewater. The pH value of each group of wastewater is controlled at 2, the temperature is 30°C, the rotation speed of the oscillation reaction is 130rpm, and the oscillation reaction time is 1min, 3min, 5min, 10min, respectively. 20min, 30min, 40min, 60min, 90min and 120min;

[0054] (3) Use a 0.22 μm filter membrane to filter each group of wastewater after the oscillation reaction to complete the removal of chromium in the wastewater.

[0055] Determination of the residual amount of heavy metal chromium in each group of wastewater samples, ...

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Abstract

The invention discloses a functionalized graphene adsorbent and a preparation method and application of the functionalized graphene adsorbent. The adsorbent is mainly composed of grapheme and cetyl trimethyl ammonium bromide. The cetyl trimethyl ammonium bromide inserts into the edge or surface layer of the layered grapheme and or embeds into the edge or surface layer of the layered grapheme through the function of non-covalent bond. The mass fraction of the cetyl trimethyl ammonium bromide in the adsorbent is 40%-50%. The invention discloses the preparation method of the functionalized graphene adsorbent. The method comprises the steps of dispersing the graphene oxide into the water, adding cetyl trimethyl ammonium bromide to the dispersed suspension liquid and stirring to make reaction, then adding suspension liquid to the heated reaction system and conducting suction filtration, washing and drying to the black cotton-shaped precipitate obtained by reduction. The functionalized graphene adsorbent can wipe out the chrome in the waste. The adsorbent is added into the chromate waste water, control the temperature of the waste, then after the full adsorption and complete oscillatory removal of the chromate is completed. The functionalized graphene adsorbent and a preparation method and application of the functionalized graphene adsorbent has the advantages of being simple, high efficient, green, economical and environmental and the like.

Description

technical field [0001] The invention belongs to the field of nanomaterials and environmental science and technology, and in particular relates to a heavy metal adsorbent and its preparation method and application. Background technique [0002] With the development of my country's economy and the advancement of science and technology, a large amount of industrial wastewater, domestic sewage and various mining wastewater are continuously released into the natural environment, causing my country to face increasingly serious water pollution problems. Due to the characteristics of high toxicity, wide distribution, easy accumulation in organisms and long duration of damage caused by heavy metal chromium pollution, it has caused serious impact on aquatic organisms and human health. Therefore, how to remove chromium pollution in water has become a concern of environmental protection researchers. [0003] At present, the treatment methods for heavy metals in wastewater that have bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F9/02C02F1/28C02F1/44C02F101/22
Inventor 袁兴中王侯吴艳祝慧娜黄华军
Owner 湖南红普创新科技发展有限公司
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