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Ethylenediamine-grafted magnetic graphene oxide, and preparation method and application thereof

A graft-modified and oxidized stone technology is applied in the field of ethylenediamine graft-modified magnetic graphene oxide and its preparation, and achieves the effects of wide source of raw materials and low price

Inactive Publication Date: 2017-11-03
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no precedent for the application of ethylenediamine-modified magnetic graphene oxide in the treatment of heavy metal-containing wastewater

Method used

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  • Ethylenediamine-grafted magnetic graphene oxide, and preparation method and application thereof
  • Ethylenediamine-grafted magnetic graphene oxide, and preparation method and application thereof
  • Ethylenediamine-grafted magnetic graphene oxide, and preparation method and application thereof

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Embodiment 1

[0029] An ethylenediamine grafted modified magnetic graphene oxide adsorbent according to the present invention comprises a graphene oxide substrate on which magnetic ferrite nanoparticles are loaded. The ethylenediamine grafted modified magnetic graphene oxide adsorbent is prepared by the following method:

[0030] (1). Preparation of pre-oxidized graphite powder

[0031] Weigh 6g of graphite powder, 5.0g of NaNO3 and 30g of KMnO4, dissolve them in the reaction vessel with an appropriate amount of ultrapure water, and assemble the reaction apparatus. Add 500ml of ultrapure water, set the reaction temperature to 0°C, and the rotation speed to 205 / rpm, react for 4 hours, and add ice once every 20 minutes. After 4 hours the reaction was suspended, the ice was removed and tap water was added for heating the water. Adjust the temperature to 35°C and react for 2h. Add 500ml ultrapure water to the reactant, and react for 1h. After the reaction was completed, 1000ml of ultrapure ...

Embodiment 2

[0040] The ethylenediamine grafted modified magnetic graphene oxide adsorbent prepared by the method of the present invention removes hexavalent chromium in wastewater, comprising the following steps:

[0041] (1). Explore the optimal reaction time: take 50ml of 10mg / L Cr6+ solution in 5 Erlenmeyer flasks, add 1ml of ethylenediamine magnetic graphene oxide, adjust the speed to 200rpm, and the temperature to 25°C (room temperature) , Respectively reacted in the shaker for 1, 3, 6, 8, 12h.

[0042] From the experimental results such as figure 2 As shown, the amount of adsorption does not change much after 3 to 8 hours of reaction. The adsorption capacity increases significantly when the reaction time reaches 12 hours, and the optimum reaction time is 12 hours at present.

[0043] (2). Explore the pH of the optimal reaction environment: Take 50ml of 10mg / L Cr6+ solution in 9 Erlenmeyer flasks and adjust the pH to 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 . Add 1-5ml of ethylenediamine ...

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Abstract

The invention discloses an ethylenediamine-grafted magnetic graphene oxide adsorbent which can be used for adsorption of hexavalent chromium in wastewater and has the advantages of low cost, a large specific surface area, high efficiency and easy separation, and a preparation method and application thereof. According to the invention, magnetic ferrite nanoparticles are assembled on the surface of graphene oxide, and then ethylenediamine is used for graft modification of the graphene oxide; and the prepared adsorbent can be rapidly separated through an external magnetic field and has more adsorption sites, which is beneficial for improvement of adsorption capacity. The whole process is low in cost, simple to operate and easy to implement, and ethylenediamine-grafted magnetic graphene oxide can be easily separated from a treated solution and be reused, so a novel approach is provided for treatment of pollution caused by heavy metals in wastewater.

Description

technical field [0001] The invention relates to the field of environmental functional materials and water treatment new technologies, in particular to a kind of ethylenediamine grafted modified magnetic graphene oxide and its preparation method and application. Background technique [0002] With the development of industries such as dyestuffs, metallurgy, electroplating, and mining, more and more heavy metal ions enter the environment, and the soil, water, and other environments that humans rely on for survival have suffered serious heavy metal pollution, and the trend is increasing. When the content of heavy metals exceeds a certain limit, it will cause the deterioration of the ecological environment and the decline of the quality of agricultural products, which will seriously affect human health. [0003] At present, industrial wastewater containing heavy metal ions mainly adopts chemical precipitation method and ion exchange method. The chemical precipitation method prod...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/20B01J20/06B01J20/22B01J20/28009C02F1/288C02F2101/22C02F2305/08
Inventor 胡新将崔理华黄柱坚邓健斌许嘉文吴翠玉廖文威赵奕娜凌宇祥杨远秀
Owner SOUTH CHINA AGRI UNIV
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