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Modified graphene adsorbent as well as preparation method and application thereof

A graphene and adsorbent technology, applied in the field of modified graphene adsorbent and its preparation, can solve problems such as limiting pollutant removal application, unfavorable dispersion, reducing graphene specific surface area, etc., and achieves improved dispersibility and hydrophilicity. , The effect of low processing cost and easily controllable conditions

Active Publication Date: 2014-07-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although studies have shown that graphene can remove pollutants in water, the agglomeration of graphene not only reduces the specific surface area of ​​graphene, but is also not conducive to dispersion in solutions, which limits its ability to remove pollutants in aqueous solutions. remove app

Method used

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  • Modified graphene adsorbent as well as preparation method and application thereof
  • Modified graphene adsorbent as well as preparation method and application thereof
  • Modified graphene adsorbent as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0037] The preparation method of the modified graphene adsorbent of the present embodiment may further comprise the steps:

[0038] (1) Disperse graphene oxide in water, and obtain a graphene oxide suspension with a concentration of 4 mg / mL after ultrasonic dispersion for 30 min;

[0039] The graphene oxide of the present embodiment is synthesized by the modified Hummers method, and the specific steps are as follows: 10 g of graphite and 5 g of sodium nitrate are slowly added into a flask containing 230 mL of concentrated sulfuric acid, and stirred in an ice-water mixture. After 30 min, slowly add 30 g of sodium nitrate. g potassium permanganate, during the stirring process, control the reaction temperature to always be less than 15°C, and keep it for 90 minutes; transfer the reaction system to a constant temperature water bath at 35°C, keep the reaction temperature at 35°C, and stir for 30 minutes; add 460mL of deionized water, the reaction temperature is controlled at 80 ℃ ~...

Embodiment 2

[0047] The preparation method of the modified graphene adsorbent of the present embodiment may further comprise the steps:

[0048] (1) Disperse graphene oxide in water, and obtain a graphene oxide suspension with a concentration of 6 mg / mL after ultrasonic dispersion for 60 min;

[0049] (2) Add aluminum hydroxide and surfactant polyacrylamide to the graphene oxide suspension obtained in step (1); wherein, the mass ratio of aluminum hydroxide, graphene oxide and polyacrylamide is 2:3:8, fully Stir, react at 60°C for 5 h, and obtain a reaction solution after complete reaction;

[0050] (3) Heating the reaction solution obtained in step (2) to 85°C, adding a reducing agent potassium borohydride, and obtaining a black flocculent precipitate after sufficient reaction; the mass of the reducing agent is 9 times the mass of graphene oxide;

[0051] (4) Suction filter, wash and dry the black flocculent precipitate obtained after step (3) to obtain a polyacrylamide-modified graphene ...

Embodiment 3

[0056] The preparation method of the modified graphene adsorbent of the present embodiment may further comprise the steps:

[0057] (1) Disperse graphene oxide in water, and obtain a graphene oxide suspension with a concentration of 5 mg / mL after ultrasonic dispersion for 40 min;

[0058] (2) Add aluminum hydroxy and surfactant sodium dodecylbenzene sulfonate to the graphene oxide suspension obtained in step (1); wherein, aluminum hydroxy, graphene oxide and sodium dodecylbenzene sulfonate The mass ratio is 2:3:10, fully stirred, reacted at 62°C for 4 h, and obtained a reaction solution after complete reaction;

[0059] (3) Heating the reaction solution obtained in step (2) to 82°C, adding a reducing agent sodium borohydride, and obtaining a black flocculent precipitate after fully reacting; the total mass of the reducing agent is 11 times the mass of graphene oxide;

[0060] (4) Suction filter, wash and dry the black flocculent precipitate obtained after step (3) to obtain a...

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Abstract

The invention discloses a modified graphene adsorbent as well as a preparation method and application thereof. The preparation method of the modified graphene adsorbent comprises the following steps: carrying out ultrasonic dispersion on oxidized graphene, adding hydroxyl aluminum and a surfactant, stirring fully, then adding a reducing agent, fully reacting so as to obtain a black flocculent precipitate, carrying out suction filtration on black flocculent precipitate, washing and drying, thereby obtaining the modified graphene adsorbent, wherein the surfactant comprises more than one of polyacrylamide, cetyl trimethyl ammonium bromide or sodium dodecyl benzene sulfonate. The modified graphene adsorbent has the characteristics of being simple, easily available, high in adsorption amount, high in removing rate and the like, and can be used for treating wastewater, especially acid dye wastewater; adopted raw materials are low in price and available; the preparation method is simple, is free from pollution, is low in cost, and is easy for industrialization.

Description

technical field [0001] The invention relates to the field of water pollution treatment, in particular to a modified graphene adsorbent and its preparation method and application. Background technique [0002] The pollution of dye wastewater to the environment is becoming more and more serious with the development of cities and industries. Dye wastewater has seriously affected the ecological environment and human beings due to its complex composition, deep color, high content of organic pollutants, poor biodegradability, refractory degradation, and most dyes and their metabolic intermediates are mutagenic, carcinogenic and other toxic. Health, and its corresponding treatment has become a hot spot of environmental protection. Congo red is a typical benzidine azoanionic dye and one of the representative pollutants in printing and dyeing wastewater. At present, the methods commonly used in the industry to treat dye wastewater include biological treatment, chemical oxidatio...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F9/02
Inventor 罗汉金吴艳王侯
Owner SOUTH CHINA UNIV OF TECH
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