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Preparation method for magnetic graphene oxide and application

A technology of stone oxide and graphene, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., to achieve the effect of wide source of raw materials and low price

Active Publication Date: 2017-08-18
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 applying magnetic graphene oxide to wastewater containing heavy metals

Method used

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  • Preparation method for magnetic graphene oxide and application
  • Preparation method for magnetic graphene oxide and application

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1). Preparation of pre-oxidized graphite powder

[0023] 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 water was added (stirring while adding), and then 40ml of H2O2 was added and stirred in the reactor for 2h. Wash with ultrapure water until neutral, dry for use.

[0024] (2). Preparation of graphene oxide

[0025] Weigh 6g pre-oxidized graphite powder, 5g NaNO3, 30g KMnO4, and assemble the reaction apparatus...

Embodiment 2

[0029] (1). Treat chromium-containing wastewater and explore the optimal reaction time:

[0030] Get 50ml of 10mg / L Cr6+ solution in 5 Erlenmeyer flasks respectively, add 2ml of magnetic graphene oxide, adjust the rotating speed to 200rpm, and the temperature is 25°C (normal temperature), respectively react 1, 3, 6, 8, 12 hours.

[0031] From the experimental results as attached figure 1 As shown, the adsorption capacity tends to be saturated when the reaction time reaches 8h, and the optimum reaction time is 8h at present.

[0032] (2). Treat chromium-containing wastewater and explore the pH of the optimal reaction environment:

[0033] Take 40-60ml 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 1ml of magnetic graphene oxide, react in a shaker for 8h (preferred reaction time), adjust the rotation speed to 200rpm, and the temperature to 25°C (normal temperature).

[0034] From the experimental results as attached ...

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Abstract

The invention provides a method for preparing magnetic graphene oxide and removing hexavalent chromium from wastewater. The application method comprises the following steps: taking a certain amount of chromate wastewater and regulating the pH value to 2.0-11.0 (optimally 2.0-5.0); adding a certain amount of magnetic graphene oxide into the wastewater; reacting for 1-12h (optimally 8-12h) in a constant temperature oscillator at a rotation speed of 180 rpm; controlling the reaction temperature to 15 DEG C-45 DEG C (optimally 35-45 DEG C); and separating the magnetic graphene oxide from the solution after the ending of the reaction, thereby completing the removal of chromium ions from the wastewater. The method provided by the invention can effectively treat the wastewater containing chromium ions and can provide a new path for treating heavy metal pollutants in the wastewater.

Description

technical field [0001] The invention relates to the field of environmental functional materials and water treatment new technologies, in particular to the application of magnetic graphene oxide in the treatment of heavy metal wastewater. 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 produces a large amount of s...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/20B01J20/30C02F1/28C02F101/22
CPCB01J20/04B01J20/20B01J20/28009C02F1/283C02F2101/22C02F2209/02C02F2209/06
Inventor 胡新将崔理华黄柱坚吴翠玉许嘉文邓健斌廖文威赵奕娜凌宇翔杨远秀
Owner SOUTH CHINA AGRI UNIV
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