Preparation and application of three-dimensional foam nickel-based nitrogen-doped graphene aerogel

A nitrogen-doped graphene, graphene aerogel technology, applied in aerogel preparation, colloid chemistry, colloid chemistry and other directions, can solve the problem of low mechanical strength of graphene aerogel, difficult recovery of cobalt catalyst, difficult recovery, etc. problem, to achieve the effect of easy recycling, excellent mechanical properties, and strong electrical conductivity

Inactive Publication Date: 2018-09-14
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to overcome the problems that traditional nano / micron-sized cobalt catalysts are not easy to recycle and the mechanical strength of graphene airgel is low in the background technology, and provide a three-dimensional foamed nickel-based nitrogen-doped graphene airgel and its preparation method
The three-dimensional foamed nickel-based nitrogen-doped graphene airgel catalyst has the advantages of high catalytic efficiency, good reusability, simple recycling method, and high mechanical strength. What is particularly outstanding is that the catalyst overcomes the difficulty of traditional nano / micro-sized cobalt catalysts. Recycling, low mechanical strength of graphene airgel, and high-salt dye wastewater are prone to produce highly toxic organic halogenated by-products during free radical oxidative degradation, etc.

Method used

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  • Preparation and application of three-dimensional foam nickel-based nitrogen-doped graphene aerogel
  • Preparation and application of three-dimensional foam nickel-based nitrogen-doped graphene aerogel
  • Preparation and application of three-dimensional foam nickel-based nitrogen-doped graphene aerogel

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Embodiment 1

[0040] Using urea as a nitrogen source, sodium tetraborate as a crosslinking agent, and ascorbic acid as a reducing agent, foamed nickel-based nitrogen-doped graphene airgel was prepared (graphene oxide 4.0%, nitrogen source 8.3%, crosslinking agent 1.7%, reducing 8.3% agent, 77.7% nickel foam), to treat acid orange 7 (0.2 mmol / L) wastewater with a salinity (NaCl) of 20 g / L. The specific preparation and use methods of foamed nickel-based nitrogen-doped graphene airgel are as follows:

[0041] (1) Pretreatment of nickel foam

[0042] Soak nickel foam (2 cm × 4 cm × 0.6 cm) in acetone and ultrasonicate for 10 minutes to remove a small amount of oil on the nickel foam substrate, thereby increasing the hydrophilicity of the substrate; ultrasonicate the nickel foam after the above treatment with distilled water 10 minutes, then etched with 6.0mol / L hydrochloric acid for 15 minutes to remove the oxide layer on the surface of the substrate and form a microscopically rough surface on...

Embodiment 2

[0052] Using ammonia water as the nitrogen source, polyvinyl alcohol as the crosslinking agent, and sodium bisulfite as the reducing agent, foamed nickel-based nitrogen-doped graphene airgel was prepared (graphene oxide 10.9%, nitrogen source 21.7%, crosslinking agent 5.4 %, reducing agent 10.9%, nickel foam 51.1%), and treat methyl orange (0.2 mmol / L) wastewater with a salinity (NaCl) of 30 g / L. The specific preparation and use methods of foamed nickel-based nitrogen-doped graphene airgel are as follows:

[0053] (1) Pretreatment of nickel foam (2 cm×5 cm×0.6 cm) was carried out according to the method of Example 1;

[0054] (2) Carry out the preparation of graphene oxide according to the method for embodiment 1;

[0055] (3) Preparation of foamed Ni-based nitrogen-doped graphene oxide.

[0056] Add graphene oxide (100 mg) into 100 mL of distilled water and stir ultrasonically for 1 h to obtain a uniformly dispersed graphene suspension; add 0.2 g of ammonia water, 0.05 g of...

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Abstract

The invention relates to preparation and application of three-dimensional foam nickel-based nitrogen-doped graphene aerogel. A preparation method comprises the following steps: preparing graphene oxide by adopting an improved Hummers method; after washing and etching foam nickel, adding the foamed nickel into a mixed solution of graphene oxide, a nitrogen source, a reducing agent and a crosslinking agent and carrying out self-assembling reaction of graphene; freezing and drying generated graphene gel to obtain the foamed nickel-based nitrogen-doped graphene aerogel. According to the preparation method provided by the invention, a compound catalyst is added into high-salt dyestuff wastewater and can be used for degrading a dyestuff adsorbed on the aerogel, so that harmless degradation is realized. The catalyst provided by the invention has the advantages of high catalytic efficiency, good reusability and the like; especially, the technical problems that a traditional nano / micron-size cobalt catalyst is not easy to recycle, the mechanical strength of the graphene aerogel is low, a high-toxicity organic halogenated byproduct and the like are easy to produce when the high-salt dyestuffwastewater is subjected to free radical oxidization degradation are prominently overcome; the catalyst can be applied to the field of treatment of the high-salt dyestuff wastewater.

Description

technical field [0001] The invention relates to a composite catalytic material used in the technical field of high-salt dye wastewater treatment, in particular to the preparation of a three-dimensional foamed nickel-based nitrogen-doped graphene airgel and its application in the treatment of high-salt dye wastewater. Background technique [0002] High-salt dye wastewater (salinity exceeding 1%) is a kind of industrial wastewater that is difficult to biodegrade and extremely harmful. Transition metal cobalt-catalyzed potassium monoperoxysulfate can generate strong oxidizing species such as sulfuric acid radicals and hydroxyl radicals, and achieve efficient degradation of most refractory organic pollutants. However, when this technology is used to treat high-salt dye wastewater, chloride ions in the wastewater can capture sulfate radicals and hydroxyl radicals to generate less active chlorine radicals, resulting in low dye mineralization efficiency. What's more serious is tha...

Claims

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Application Information

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IPC IPC(8): B01J13/00B01J27/24C01B32/198C02F1/72C02F101/30C02F101/34C02F101/38
CPCB01J13/0091B01J27/24C01B32/198C02F1/722C02F1/725C02F2101/308C02F2101/34C02F2101/38C02F2101/40C02F2305/02C02F2305/023
Inventor 袁瑞霞汪怀远于鹏姜明朗高斯萌聂春红
Owner NORTHEAST GASOLINEEUM UNIV
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