Method for preparing functionalized graphene

A technology of fossil and graphene, applied in the field of preparation of functionalized graphene, can solve problems such as high price and limited application, and achieve the effects of simple preparation process, wide source and wide source of raw materials

Inactive Publication Date: 2016-03-23
FUQING BRANCH OF FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these adsorption materials have a good removal effect on heavy metals in water, they need to be further modified due to the small number of active functional groups contained in agricultural waste; carbon nanotubes, polyaniline materials, etc. are expensive, and to a certain extent Limited application in environmental remediation
However, there is no report on the preparation of functionalized graphene by attaching graphene oxide on the surface of magnetic chitosan microspheres, and using it as an adsorbent for heavy metal ions in water.

Method used

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  • Method for preparing functionalized graphene
  • Method for preparing functionalized graphene
  • Method for preparing functionalized graphene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Preparation of graphene oxide: Add 1g of natural graphite powder (8000 mesh) and 30mL of concentrated sulfuric acid into a single-necked round-bottomed flask, slowly magnetically stir for 6h under cooling in a dry ice bath, and then slowly add 3gKMnO under vigorous stirring. 4 Powder, react at 0-20°C for 30 minutes, then react at 33-35°C for 30 minutes. Subsequently, 30 mL of deionized water was slowly added and reacted at 93-95° C. for 35 min. Finally, 140 mL of deionized water and 10 mL of 30% hydrogen peroxide solution were added to terminate the reaction. After the reaction, the mixed solution was filtered with a microporous membrane (pore size 4 2- ), use barium chloride solution to detect whether the excess SO 4 2- remove. Finally, the material prepared by the above method was vacuum-dried at 60° C. to obtain graphite oxide. Weigh a certain amount of graphite oxide and disperse it in deionized water, after ultrasonic stripping for 3-5 hours, centrifuge at ...

Embodiment 2

[0046] Take 5.0 g of functionalized graphene, and take 20.00 mL of mass concentration as 10 μg·mL -1 Cd 2+ As the research object, when the adsorption time is 3.5h, the pH is 5.0, and the adsorption temperature is 35℃, the adsorption capacity of the solution is the best. The unit adsorption capacity is 136.07μg·g -1, The adsorption rate can reach 75.85%. Its adsorption kinetics conforms to the Freundlich formula. According to thermogravimetric analysis, the functionalized graphene can exist stably at 150°C, and has good thermal stability. And due to the existence of magnetic chitosan microspheres, magnetic separation can be realized.

[0047] Functionalized graphene to Cd under optimal conditions in the present embodiment of table 1 2+ Adsorption

[0048]

Embodiment 3

[0050] Get functionalized graphene 5.0g, to 20mL mass concentration be the Cu of 100mg / L 2+ The adsorption test of the solution was carried out. When the adsorption time was 4h, the pH was 6.0, and the adsorption temperature was 30°C, the Cu 2+ The adsorption capacity of ions is the best. The unit adsorption capacity is 1.71mg / g, and the adsorption rate can reach more than 99%. Its adsorption kinetics conforms to the Langmuir formula. According to thermogravimetric analysis, the functionalized graphene can exist stably at 150°C, and has good thermal stability. And due to the existence of magnetic chitosan microspheres, magnetic separation can be realized.

[0051] Functionalized graphene to Cu under optimal conditions in the present embodiment of table 2 2+ Adsorption

[0052]

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Abstract

The invention discloses a method for preparing functionalized graphene. The method includes the following steps that oxidized graphene and magnetic chitosan microspheres are respectively prepared; the oxidized graphene is dispersed in a deionized water solution to obtain an oxidized graphene solution, and the magnetic chitosan microspheres are soaked into the oxidized graphene solution and subjected to standing to obtain the functionalized graphene. The method for preparing the functionalized graphene has the advantages that chitosan which is nontoxic, low in price, easy to obtain and wide in source and graphite powder are used as raw materials, the oxidized graphene and the magnetic chitosan microspheres are self-prepared in a lab and are combined through an electrostatic interaction to prepare the functionalized graphene material, and the adsorption performance of the functionalized graphene material to heavy metal ions in water is studied. The functionalized graphene is simple in preparation process and wide in source of raw materials, fully utilizes repairing performance of the oxidized graphene to polluted water, and is also combined with separability of the magnetic chitosan microspheres.

Description

technical field [0001] The invention relates to a preparation method of functionalized graphene, which belongs to the technical field of adsorption materials. Background technique [0002] Due to its flexibility in design and operation, and its reversibility and high efficiency, the adsorption method is considered to be an efficient, fast and economical means of heavy metal wastewater treatment, and has been widely studied and applied. At present, there are many kinds of adsorbents, and the commonly used heavy metal adsorption materials mainly include agricultural waste (such as bark, straw, etc.), carbonaceous materials such as activated carbon and carbon nanotubes, polyaniline materials, and chitosan materials. Li Ronghua (Li Ronghua, Yue Qingling, Yang Yati, Zhang Guangjie, Qin Rui, Zhang Meng, Zhang Zengqiang. Study on thermodynamic characteristics of adsorption of Hg(Ⅱ) by mercapto-modified corn straw[J]. Journal of Environmental Science, 2012,32(10):2435 -2442.), Zeng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/20B01J20/24B01J20/28009B01J20/28021B01J2220/4806B01J2220/4825C02F1/288
Inventor 陈盛丁蕊罗志敏薛丽群林秀珠
Owner FUQING BRANCH OF FUJIAN NORMAL UNIV
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