Nitrogen-doped carbon-coated aluminum material as well as preparation method and application thereof

A nitrogen-doped carbon, aluminum-coated technology, applied in transportation and packaging, metal processing equipment, reduced water/sewage treatment, etc., can solve the problems of high energy consumption and aluminum consumption, reduce side reactions, improve efficiency, Wide application prospects

Active Publication Date: 2022-06-28
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of aluminum consumption, high energy consumption, and unsolvable problems in the existing methods of removing aluminum oxide film by acid, alkali washing or ball milling, the present invention provides a nitrogen-doped carbon-coated aluminum material, the surface of which is Form a nitrogen-doped carbon layer, which improves the reduction activity of aluminum and prevents the formation of an oxide film on the aluminum surface. It can efficiently reduce and degrade oxo acid salts and halogenated organic pollutants in water, wastewater, and concentrated brine.

Method used

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  • Nitrogen-doped carbon-coated aluminum material as well as preparation method and application thereof
  • Nitrogen-doped carbon-coated aluminum material as well as preparation method and application thereof
  • Nitrogen-doped carbon-coated aluminum material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0050] A preparation method of nitrogen-doped carbon-coated aluminum material, comprising the following steps:

[0051]1) Dissolve 60.6 mg of tris(hydroxymethylaminomethane) in 50 mL of deionized water, and adjust pH=10.0 with hydrochloric acid and sodium hydroxide solution.

[0052] 2) Dopamine is added to the solution obtained in step 1) to dissolve, and then 1 g of aluminum is added to react. The mass ratio of aluminum to dopamine, the form of aluminum and the reaction time are shown in Table 3 below.

[0053] 3) Rinse the aluminum obtained in step 2) with deionized water for 3 times, dry the moisture in an oven at 105° C., calcinate at 600° C. for 2 hours in a tube furnace under nitrogen atmosphere after drying, and cool to room temperature to obtain nitrogen-doped Miscellaneous carbon clad aluminum material.

[0054] The process conditions of table 3 embodiment 1-5

[0055]

[0056]

[0057] figure 1 For the XRD of the aluminum obtained in Comparative Example 1 ...

Embodiment 6

[0064] The uncoated aluminum obtained in Comparative Example 1, the carbon-coated aluminum obtained in Comparative Example 3, and the nitrogen-doped carbon-coated aluminum materials obtained in Examples 1-4 were respectively put into an aqueous solution of potassium bromate with an initial concentration of bromate of 10 μM, After mixing, the aluminum concentration was 2 g / L, and the reaction was magnetically stirred for 1 hour, and the concentration of the remaining bromate in the solution was measured by ion chromatography. Figure 5 It is the degradation rate of bromate by the methods in Examples 1-4, Comparative Example 1 and Comparative Example 2.

[0065] Take 1 g each of the uncoated aluminum foam obtained in Comparative Example 2 and the bulk nitrogen-doped carbon-coated aluminum foam obtained in Example 5, and put them into 100 mL of potassium bromate aqueous solution with an initial concentration of bromate of 0.1 mM, respectively, and react for 1 hour. , the concentr...

Embodiment 7

[0068] The nitrogen-doped carbon-coated aluminum material obtained in Example 2 was put into an aqueous solution of potassium bromate with an initial concentration of 10 μM, the concentration of the nitrogen-doped carbon-coated aluminum material after mixing was 2 g / L, and the magnetic stirring reaction was performed for 1 hour. Then, the nitrogen-doped carbon-coated aluminum material was filtered, washed and dried, and then reacted again under the same conditions for 5 cycles. The concentration of bromate remaining in the solution was determined by ion chromatography.

[0069] Image 6 It shows the effect of recycling the nitrogen-doped carbon-coated aluminum material prepared in Example 2 to reduce bromate. After 5 times of recycling, the complete reduction and degradation of 10 μM potassium bromate can still be achieved within 1 hour. Nitrogen-doped carbon-coated aluminum materials have good stability.

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Abstract

The invention belongs to the technical field of water and wastewater treatment, and particularly relates to a nitrogen-doped carbon-coated aluminum material, a preparation method thereof and application of the nitrogen-doped carbon-coated aluminum material to removal of oxysalt and halogenated organic pollutants. The invention provides a preparation method of a nitrogen-doped carbon-coated aluminum material. According to the preparation method, dopamine is used as a carbon source and a nitrogen source, nitrogen elements are introduced into a formed carbon layer by utilizing amino groups contained in the dopamine, and then the nitrogen-doped carbon-coated aluminum material is prepared in a manner of calcination in a nitrogen atmosphere. According to the method, the nitrogen-doped carbon layer is formed on the aluminum surface, the reduction activity of aluminum is improved, an oxidation film on the aluminum surface is prevented from being formed, meanwhile, the nitrogen-doped carbon layer can accelerate electrons to be transmitted outwards from an aluminum inner core, and therefore the activity of aluminum for reducing and degrading pollutants is improved. The nitrogen-doped carbon-coated aluminum material disclosed by the invention can be used for efficiently reducing and degrading oxysalt and halogenated organic pollutants in water, wastewater and strong brine.

Description

technical field [0001] The invention belongs to the technical field of water and wastewater treatment, and in particular relates to a nitrogen-doped carbon-coated aluminum material, a preparation method thereof, and an application in removing oxo acid salts and halogenated organic pollutants. Background technique [0002] As the third most abundant element in the earth's surface, aluminum has gradually attracted attention in the field of water treatment in recent years. Aluminum has a lower redox potential and has a higher reducing power than iron. However, due to the dense aluminum oxide film on the surface of aluminum, it is not conducive to the outward transfer of electrons, and the oxide film is very stable in the range of pH 4-9, so that the ability of aluminum to reduce pollutants under neutral conditions is inhibited. [0003] In view of the fact that aluminum is not easy to release electrons due to the existence of the oxide film, acid / alkali washing is often used t...

Claims

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Application Information

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IPC IPC(8): B22F1/16B22F1/07B22F1/065C02F1/70
CPCC02F1/70Y02E60/10
Inventor 张涛陈实
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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