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Graphene/silicon dioxide/nano zero-valent iron composite as well as preparation method and application thereof

A nano-zero-valent iron and silicon dioxide technology, applied in chemical instruments and methods, water/sludge/sewage treatment, other chemical processes, etc., can solve the problems of limiting the application of graphene, losing specific surface area, etc., and achieve abundant reserves , Improve the specific surface area and stability, and prevent the effect of agglomeration

Active Publication Date: 2016-04-06
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 re-stacking and agglomeration, 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/silicon dioxide/nano zero-valent iron composite as well as preparation method and application thereof
  • Graphene/silicon dioxide/nano zero-valent iron composite as well as preparation method and application thereof
  • Graphene/silicon dioxide/nano zero-valent iron composite as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Add 0.3g of graphite oxide solid, 1.5g of cetyltrimethylammonium bromide and 0.9g of sodium hydroxide into water, and obtain modified graphene oxide with a concentration of 0.3g / L after ultrasonic treatment at 180W for 2h suspension;

[0041]Graphite oxide in this example is prepared by the improved Hummers method. The specific steps are: slowly add 120ml of concentrated sulfuric acid to a 1000mL beaker and place it in a mixture of ice and water, stir it slowly with an electric stirrer, and when the temperature drops When the temperature reaches about 5°C, add 5g of graphite and 2.5g of sodium nitrate, stir for 30 minutes and slowly add 15g of potassium permanganate, keep the temperature of the reaction system not higher than 15°C during the process, and continue the reaction for 90 minutes; place the beaker at 35°C In a constant temperature water bath, when the temperature of the system rises to 35°C, continue to stir for 30 minutes; continuously and slowly add 230...

Embodiment 2

[0047] (1) Add 0.2g of graphite oxide solid, 1.0g of cetyltrimethylammonium bromide and 0.6g of sodium hydroxide into water, and obtain modified graphene oxide with a concentration of 0.2g / L after ultrasonic treatment at 190W for 2h suspension;

[0048] (2) After the modified graphene oxide suspension obtained in step (1) is magnetically stirred for 2h, add 14mL tetraethyl orthosilicate, and the mass ratio of graphene oxide and tetraethyl orthosilicate is 1:13; continue Stir for 36 hours, and keep the temperature at 40°C. After fully reacting, the product is centrifugally washed with deionized water until the product does not contain bromide ions, and the graphene oxide / silica solid is obtained after drying;

[0049] (3) The solid obtained in step (2) is put into a tube furnace and fed with nitrogen for calcination, the nitrogen flow is controlled at 40mL / min, the tube furnace calcination temperature is 550°C, and the calcination time is 180min to obtain graphene / di Silica so...

Embodiment 3

[0054] (1) Add 0.4g of graphite oxide solid, 2g of cetyltrimethylammonium bromide and 1.2g of sodium hydroxide into water, and obtain a modified graphene oxide suspension with a concentration of 0.4g / L after ultrasonic treatment at 200W for 2h liquid;

[0055] (2) After the modified graphene oxide suspension obtained in step (1) is magnetically stirred for 2h, add 20mL tetraethyl orthosilicate, and the mass ratio of graphene oxide and tetraethyl orthosilicate is 1:17; continue Stir for 40 hours, and keep the temperature at 40°C. After fully reacting, the product is centrifugally washed with deionized water until the product does not contain bromide ions, and the graphene oxide / silica solid is obtained after drying;

[0056] (3) put the solid obtained in step (2) into a tube furnace and feed nitrogen for calcination, the nitrogen flow rate is controlled at 60mL / min, the tube furnace calcination temperature is 550°C, and the calcination time is 180min to obtain graphene / di Sili...

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Abstract

The invention discloses a graphene / silicon dioxide / nano zero-valent iron composite as well as a preparation method and application thereof. The preparation method comprises the following steps: after the graphene oxide is subjected to ultrasonic dispersion, adding tetraethyl orthosilicate, drying after magnetic stirring is carried out completely, introducing nitrogen in a tubular furnace for calcination, adding deionized water into the solids obtained through calcination, after ultrasonic dispersion, introducing nitrogen and adding ferrous sulfate heptahydrate, after uniform stirring, and adding a reducing agent for reducing so as to obtain black flocculent precipitates after complete reaction, washing, carrying out suction filtration, drying, grinding and screening through a sieve so as to obtain the graphene / silicon dioxide / nano zero-valent iron composite. The graphene / silicon dioxide / nano zero-valent iron composite prepared according to the preparation method can be applied to the field of water pollution control as an adsorbent, particularly adsorption removal of arsenic pollutants in waste water, and has the advantages of simple and convenient preparation process, high adsorption speed and the like, and in addition, the required raw materials are wide in source, low in cost and high in practical application value.

Description

technical field [0001] The invention relates to the technical field of water pollution control, in particular to a graphene / silicon dioxide / nano zero-valent iron composite material and its preparation method and application. Background technique [0002] With the rapid development of industrial economy and the increase of industrial production intensity, more and more arsenic-containing wastewater is discharged into natural water bodies, and water is an essential resource for human beings. A large amount of arsenic discharge seriously endangers the ecological environment and human health. The treatment of arsenic-containing wastewater is urgent. Arsenic-containing wastewater has the characteristics of high toxicity, refractory degradation, and easy bioaccumulation, and has great potential harm to the natural environment and human beings. Arsenic pollutants have been listed as one of the priority pollutants. Therefore, the removal of arsenic-containing wastewater has always b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/58
CPCB01J20/0229B01J20/103B01J20/20C02F1/281C02F1/288
Inventor 罗汉金刘佩佩
Owner SOUTH CHINA UNIV OF TECH
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