Magnetic nitrogen-doped reduced graphene oxide compound catalyst as well as preparation method and application thereof

A graphene composite, nitrogen-doped technology, applied in the field of water treatment, can solve problems such as unfavorable operation, and achieve the effects of improving electrical conductivity, simple preparation process, and improving transmission performance

Active Publication Date: 2017-08-08
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene oxide is apparently a powder material. When used in water treatment applications, it needs to be separated from the liquid phase by centrifugation or filtration, or loaded on a fixed material, which is not conducive to practical operation.

Method used

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  • Magnetic nitrogen-doped reduced graphene oxide compound catalyst as well as preparation method and application thereof
  • Magnetic nitrogen-doped reduced graphene oxide compound catalyst as well as preparation method and application thereof
  • Magnetic nitrogen-doped reduced graphene oxide compound catalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0042] A magnetic nitrogen-doped reduced graphene oxide composite catalyst, the magnetic nitrogen-doped reduced graphene oxide composite catalyst is prepared by using urea as a nitrogen source and a reducing agent, mixed with magnetic graphene oxide, and then undergoing hydrothermal reaction.

[0043] In this embodiment, the mass content of nitrogen element in the magnetic nitrogen-doped reduced graphene oxide composite catalyst is 5.6%.

[0044] In this embodiment, the magnetic graphene oxide is based on graphene oxide, and ferric oxide is deposited on the surface of the graphene oxide substrate, wherein the mass ratio of ferric oxide and graphene oxide is 4:1.

[0045] A preparation method of the magnetic nitrogen-doped reduced graphene oxide composite catalyst in the above-mentioned present implementation, comprising the following steps:

[0046] (1) Preparation of magnetic graphene oxide:

[0047] (1.1) Graphene oxide was prepared by the hummer method.

[0048] (1.2) Wei...

Embodiment 2

[0060] The application of a magnetic nitrogen-doped reduced graphene oxide composite catalyst in the degradation of dye wastewater comprises the following steps:

[0061] Get 50mL, concentration is the methylene blue solution of 10mg / L, adjust the pH of methylene blue solution to be 4 with sulfuric acid or sodium hydroxide solution, add the magnetic nitrogen-doped reduction graphene oxide composite catalyst (M-N-rGO) prepared in 10mg embodiment 1 Mix evenly, add potassium persulfate, the amount of potassium persulfate added is 0.4mmol of potassium persulfate per liter of methylene blue solution, under the condition of avoiding light, shake it in a water bath shaker at 25°C, and catalyze the degradation 2h, then a small amount of KI solution was added to terminate the reaction. Samples were taken for magnetic separation, and the remaining methylene blue concentration was measured. The results of the degradation treatment of methylene blue are shown in Table 1.

[0062] In orde...

Embodiment 3

[0069] The application of a magnetic nitrogen-doped reduced graphene oxide composite catalyst in the degradation of dye pollutants in wastewater comprises the following steps:

[0070]Get 6 groups of 50mL, concentration is the methylene blue solution of 10mg / L, adjust the pH of each group of methylene blue solution with sulfuric acid or sodium hydroxide solution to be 3,5,6,7,9,11, each add 10mg of the methylene blue solution prepared in embodiment 1 The magnetic nitrogen-doped reduced graphene oxide composite catalyst (M-N-rGO) is mixed evenly, and potassium persulfate is added, wherein the amount of potassium persulfate added is 0.4 mmol of potassium persulfate per liter of methylene blue solution. , in a water-bath shaker at a temperature of 25° C., for catalytic degradation for 2 hours, and then a small amount of KI solution was added to terminate the reaction. Sampling for magnetic separation, and determination of the remaining methylene blue concentration, the results of...

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Abstract

The invention discloses a magnetic nitrogen-doped reduced graphene oxide compound catalyst as well as a preparation method and application thereof. The magnetic nitrogen-doped reduced graphene oxide compound catalyst is prepared by taking urea as a nitrogen source and a reducing agent, mixing the urea with magnetic graphene oxide and carrying out hydrothermal reaction. The compound catalyst disclosed by the invention has the advantages of no toxin, low cost, simple preparation process, easiness in separation, convenience for regeneration, good catalytic effect and the like; the preparation method of the compound catalyst has the advantages of simplicity in operation, low requirements on instrument equipment and experiment conditions, less energy resource consumption, convenience for large-scale preparation and the like. The compound catalyst provided by the invention can be used for treating organic pollutants, which are difficult to degrade, in wastewater; high-activity sulfate radical groups are generated through catalyzing persulfate, so that the organic pollutants which are difficult to degrade, especially dyestuff pollutants, in the water are efficiently removed; the compound catalyst has the advantages of high catalytic degradation effect, wide application range, simplicity and convenience for operation, no secondary pollution and the like.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a magnetic nitrogen-doped reduced graphene oxide composite catalyst and a preparation method and application thereof. Background technique [0002] The treatment of refractory organic pollutants is an important content in the field of water pollution control. As one of the pollutants, dyes exist in sewage, which have the characteristics of extremely high chroma, high toxicity and difficult biodegradation. Commonly used technologies for treating dye wastewater include adsorption, chemical oxidation, photocatalytic degradation, and microbial treatment. Among them, the chemical oxidation method, especially the advanced oxidation technology that generates hydroxyl and sulfate radicals, has the advantages of good pollutant treatment effect, thorough pollutant degradation, convenient operation, large-scale use, and low cost. [0003] The advanced oxidation technology based on sulfate rad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/10B01J37/16C02F1/72C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J27/24B01J35/0033B01J37/10B01J37/16C02F1/722C02F1/725C02F2101/308C02F2101/345C02F2101/36C02F2101/38C02F2101/40
Inventor 庞娅罗琨李雪黎明奇雷敏廖兴盛
Owner CHANGSHA UNIVERSITY
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