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Graphene / montmorillonite nano composite material, and preparation method and application thereof

A technology of nanocomposite materials and montmorillonite, which is applied in the field of graphene/montmorillonite nanocomposite materials and its preparation, can solve the problem of loss of specific surface area and achieve the effect of low equipment requirements, abundant reserves and low investment

Active Publication Date: 2015-07-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation process, graphene flakes will undergo irreversible restacking, causing them to lose most of their specific surface area, thus limiting the application of graphene as an adsorbent in water pollution control.

Method used

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  • Graphene / montmorillonite nano composite material, and preparation method and application thereof
  • Graphene / montmorillonite nano composite material, and preparation method and application thereof
  • Graphene / montmorillonite nano composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) 0.25g graphite oxide solid was added into water, and after ultrasonic treatment for 2 h, the graphene oxide suspension with a concentration of 0.25 g / L was obtained;

[0039] Graphite oxide in this example is prepared by the improved Hummers method, and the specific steps are: add 120 ml of concentrated sulfuric acid to a 1 L beaker and place it in an ice-water bath, stir it slowly with an electric stirrer, and when the temperature drops to 4 At about ℃, add 5 g of graphite and 2.5 g of sodium nitrate, continue to stir for 30 minutes, then slowly add 15 g of potassium permanganate, keep the temperature of the reaction system not higher than 20 ℃, and continue to react for 90 minutes; move the beaker to In a constant temperature water bath at 35°C, when the temperature of the system rises to 35°C, continue to stir for 30 minutes; add 230 ml of deionized water to the beaker continuously and slowly, control the temperature of the system below 98°C, and keep the temperat...

Embodiment 2

[0046] (1) Add 0.5g of graphite oxide solid into water, and obtain a graphene oxide suspension whose concentration is 0.25 g / L after ultrasonic treatment for 2h;

[0047] (2) Dispersing the organically modified montmorillonite in water, the amount added meets: the mass ratio of graphene oxide to montmorillonite is 2:10;

[0048] (3) Place the graphene oxide suspension obtained in step (1) in an ultrasonic cleaner, ultrasonically and stir it with an electric stirrer (350 rpm) while slowly adding the organic modification obtained in step (2). For the montmorillonite suspension, stir well to mix the two evenly; continue ultrasonic stirring for 1 h, stop the ultrasonic, then stir (300 rpm) and let the system react for 2 h, and finally obtain a uniform and stable brown suspension; use the suspension Disperse in 1 L deionized water after washing with deionized water for several times;

[0049] (4) Put the brown suspension obtained in step (3) in a constant temperature water bath at...

Embodiment 3

[0054] (1) 0.75g of graphite oxide solid was added into water, and obtained after ultrasonic treatment for 2h, was a graphene oxide suspension of 0.25 g / L;

[0055] (2) Dispersing an appropriate amount of organically modified montmorillonite in water, the amount of organically modified montmorillonite meets: the mass ratio of graphene oxide to montmorillonite is 3:10;

[0056] (3) Place the graphene oxide suspension obtained in step (1) in an ultrasonic cleaner, ultrasonically and stir it with an electric stirrer (350 rpm) while slowly adding the organic modification obtained in step (2). For the montmorillonite suspension, stir well to mix the two evenly; continue ultrasonic stirring for 1 h, stop the ultrasonic, then stir (300 rpm) and let the system react for 2 h, and finally obtain a uniform and stable brown suspension; use the suspension Disperse in 1 L deionized water after washing with deionized water for several times;

[0057] (4) Put the brown suspension obtained in...

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PUM

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Abstract

The invention discloses a graphene / montmorillonite nano composite material, and a preparation method and application thereof. The preparation method of the graphene / montmorillonite nano composite material is as below: uniformly mixing cetyl trimethyl ammonium bromide modified montmorillonite suspension and graphene oxide suspension subjected to ultrasonic treatment, fully stirring, adding a reducing agent for reduction, so as to obtain a black flocculent precipitate after the reaction, and conducting washing, suction filtration, drying, grinding and screening to obtain the graphene / montmorillonite nano composite material. The graphene / montmorillonite nano composite material prepared by the method can be used as an adsorbent in the field of water pollution control, especially adsorption and removal of the heavy metal pollutants in wastewater, and has the advantages of simple preparation method, high adsorption speed, easy regeneration, and reuse. The raw materials have wide sources, low cost and high actual application value.

Description

technical field [0001] The invention relates to the technical field of water pollution control, in particular to a graphene / montmorillonite nanocomposite material and a preparation method and application thereof. Background technique [0002] With the continuous development of industrial economy, more and more wastewater containing heavy metals or organic pollutants is discharged into natural water bodies, seriously endangering the ecological environment and human health. Water pollution is a major environmental problem faced by many countries around the world, especially developing countries. China has a large number of production and processing enterprises, so the current situation of water pollution is naturally not optimistic. Heavy metal pollutants in wastewater are difficult to degrade, highly toxic, and easy to accumulate in organisms, and have great potential harm to the natural environment and human beings. Therefore, the removal of heavy metal pollutants in wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 罗汉金张子龙
Owner SOUTH CHINA UNIV OF TECH
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