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Compound grapheme absorption agent, method for preparing compound grapheme absorption agent and application of compound grapheme absorption agent

A technology of graphene and adsorbent, which is applied in the field of composite graphene adsorbent and its preparation, 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 the dispersion and The effect of hydrophilicity, low cost of treatment process, and easy control of conditions

Inactive Publication Date: 2014-01-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene materials have fewer applications in the environment
Studies have shown that graphene can remove pollutants such as organic pollutants, 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 ability to remove pollutants in aqueous solution. remove app

Method used

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  • Compound grapheme absorption agent, method for preparing compound grapheme absorption agent and application of compound grapheme absorption agent
  • Compound grapheme absorption agent, method for preparing compound grapheme absorption agent and application of compound grapheme absorption agent
  • Compound grapheme absorption agent, method for preparing compound grapheme absorption agent and application of compound grapheme absorption agent

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Embodiment 1

[0042] The preparation method of the composite graphene adsorbent of the present embodiment may further comprise the steps:

[0043] (1) Disperse graphene oxide in water, and obtain a graphene oxide suspension with a concentration of 4 mg / mL after ultrasonic dispersion for 30 minutes;

[0044] 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 to a flask containing 230 ml of concentrated sulfuric acid, and stirred in an ice-water mixture. After 30 min, slowly add 30 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°C to 95°C, and the sti...

Embodiment 2

[0054] The preparation method of the composite graphene adsorbent of the present embodiment may further comprise the steps:

[0055] (1) Disperse graphene oxide in water, and obtain a graphene oxide suspension with a concentration of 6 mg / mL after ultrasonic dispersion for 60 minutes;

[0056] (2) Add nano-zero-valent iron and cetyltrimethylammonium bromide to the graphene oxide suspension obtained in step (1); wherein, nano-zero-valent iron, graphene oxide and cetyltrimethylammonium The mass ratio of ammonium bromide is 1:2:9, fully stirred, and reacted for 5h at 50°C, and obtained a reaction solution after complete reaction;

[0057] (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;

[0058] (4) Suction filter, wash and dry the black flocculent precipitate obtained after ste...

Embodiment 3

[0061] The preparation method of the composite graphene adsorbent of the present embodiment may further comprise the steps:

[0062] (1) Disperse graphene oxide in water, and obtain a graphene oxide suspension with a concentration of 5 mg / mL after ultrasonic dispersion for 40 minutes;

[0063] (2) Add nano-zero-valent iron and cetyltrimethylammonium bromide to the graphene oxide suspension obtained in step (1); wherein, nano-zero-valent iron, graphene oxide and cetyltrimethylammonium The mass ratio of ammonium bromide is 1: 2: 8, fully stirred, and reacted for 4 hours at 52 ° C, and obtained a reaction solution after complete reaction;

[0064] (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;

[0065] (4) Suction filter, wash and dry the black flocculent precipitate obtained a...

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Abstract

The invention discloses a compound grapheme absorption agent which comprises grapheme, nanometer zero-valent iron and cetyl trimethyl ammonium bromide. The invention further discloses a method for preparing the compound grapheme absorption agent. The method for preparing the compound grapheme absorption agent includes the following steps that firstly, oxidized grapheme is dispersed in water with ultrasonic waves and oxidized grapheme suspension liquid is obtained; secondly, the nanometer zero-valent iron and the cetyl trimethyl ammonium bromide are added into the oxidized grapheme suspension liquid obtained in the first step, fully stirred and fully reacted and a reaction solution is obtained; thirdly, the reaction solution obtained in the second step is added with reductive agents and fully reacted and black flocks are obtained; fourthly, the black flocks obtained in the third step are filtered, washed and dried to obtain the compound grapheme absorption agent. The compound grapheme absorption agent is efficient, green, economic, friendly to environment, and suitable for large-scale production. The preparing method is simple and conditions are easy to control.

Description

technical field [0001] The invention relates to the field of organic pollutant adsorbents, in particular to a composite graphene adsorbent and its preparation method and application. Background technique [0002] Due to the rapid development of industry and the continuous improvement of people's living standards, the proportion of organic pollutants in polluted water bodies is increasing. As a harmful and refractory organic pollutant, p-nitrochlorobenzene, It has been widely concerned by people for a long time. It is widely used in the production process of pesticides, medicines, dyes and rubber additives, and enters into various water bodies with the discharge of industrial wastewater. As a result, it can be detected in some major water bodies in my country. The presence of nitrochlorobenzene. In addition to causing methemoglobinemia in humans and other mammals, it is a mutagen and carcinogen and is difficult to degrade in the environment. Therefore, it is of great signific...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/58
Inventor 罗汉金吴艳王侯
Owner SOUTH CHINA UNIV OF TECH
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