Carbon-based metal monatomic composite material as well as preparation method and application thereof

A composite material and metal-based technology, applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc. Problems such as the industrial application of single-atom materials, to achieve the effect of improving catalytic activity and cycle stability, no secondary pollution, and conducive to large-scale application

Active Publication Date: 2021-03-23
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the carbon substrates in the existing carbon-based single-atom materials use graphene, carbon nanotubes and other materials, which are expensive and greatly limit the industrial application of carbon-based single-atom materials; and the catalytic activity needs to be further improved

Method used

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  • Carbon-based metal monatomic composite material as well as preparation method and application thereof
  • Carbon-based metal monatomic composite material as well as preparation method and application thereof
  • Carbon-based metal monatomic composite material as well as preparation method and application thereof

Examples

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preparation example Construction

[0036] The invention provides a method for preparing a carbon-based metal single-atom composite material, comprising the following steps:

[0037] mixing coffee grounds and soluble metal salts for metal loading to obtain a composite material precursor; the soluble metal salts are used in the form of a soluble metal salt solution;

[0038] The composite material precursor is subjected to anaerobic pyrolysis to obtain the carbon-based metal single-atom composite material.

[0039] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0040] The invention mixes coffee grounds and soluble metal salts to carry out metal loading to obtain a composite material precursor.

[0041] In the present invention, the particle size of the coffee grounds is preferably ≤100 mesh; the source of the coffee grounds is not specifically limited in the present invention, and is specifical...

Embodiment 1

[0059] The raw material of coffee grounds in this example is the filter residue of a household coffee machine; the obtained coffee grounds raw material was washed with 50 times the volume of water, and then suction-filtered, and the filter residue was dried in a blast drying oven at 80° C. for 8 hours. Use a small pulverizer to pulverize the dried coffee grounds until the biomass particles obtained by pulverization can pass through a 100-mesh sieve, and the under-sieve is coffee grounds;

[0060] Immerse the coffee grounds in a cobalt nitrate aqueous solution with a concentration of 3.6mmol / L, the mass ratio of the coffee grounds to the cobalt nitrate aqueous solution is 1:15, shake at room temperature for 24 hours, and the oscillation speed is 200rpm; suction filter the mixed system, and place the filter residue in Dry in a forced air oven for 12 hours at 80°C to obtain a composite material precursor for future use.

[0061] Determination of the cobalt content in the composit...

Embodiment 2

[0085] The coffee grounds in this example come from the waste of the commercial coffee shop Luckin. The same preparation method as in Example 1, except that the soluble metal salt is iron salt, and the anaerobic pyrolysis temperature is 700°C. The content of iron in the prepared carbon-based iron single-atom material is 2.92mg / g.

[0086] Performance Testing

[0087] Add 100 times the mass of sulfuric acid with a concentration of 1 mol / L to the carbon-based iron single-atom composite material prepared in Example 2, measure the dissolution of iron in the supernatant after shaking for 4 hours, and the dissolution rate is less than 0.1%, which proves that iron is mainly based on stable It exists in the form of single atoms, and there are almost no nanoparticles of iron element or oxide.

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Abstract

The invention provides a carbon-based metal monatomic composite material as well as a preparation method and application thereof, and belongs to the technical field of biomass materials. Waste coffeegrounds are used as raw materials, and the coffee grounds are large in specific surface area and rich in various functional groups on the surfaces, so that after a soluble metal salt is soaked, the soluble metal salt is chelated with nitrogen-containing and sulfur-containing nonmetal groups in the coffee grounds through covalent interaction; in the anaerobic pyrolysis process, the main body part of the coffee grounds is pyrolyzed into biomass carbon to form a carbon substrate, and the metal salt is loaded on the carbon substrate in an N and S coordinated monoatomic form; and the metal is loaded on the carbon substrate in the form of single atoms, so that the coordination unsaturation degree and atom utilization rate of metal atoms and surrounding coordination atoms (nitrogen and sulfur) are greatly increased, and the catalytic activity and cycle stability of the carbon-based metal monatomic composite material are improved. Meanwhile, the preparation method disclosed by the invention issimple and low in cost, and recycling is realized.

Description

technical field [0001] The invention relates to the technical field of biomass materials, in particular to a carbon-based metal single-atom composite material and its preparation method and application. Background technique [0002] Modern agriculture has the characteristics of intensification, specialization and scale, and the output level has been greatly improved; at the same time, the total amount of agricultural waste emissions has also increased. Agricultural waste mainly includes crop straw, livestock and poultry manure, fruit and vegetable residues, etc. Improper disposal, such as straw burning and random discharge of livestock and poultry manure, will cause serious environmental pollution and affect social development and human health. At the same time, agricultural waste is rich in organic matter and various nutrients, and is a valuable and renewable biomass resource. Therefore, the resource utilization of agricultural waste is an important part of controlling agr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/34B01J23/745B01J23/755B01J27/24B01J37/08B01J23/06C02F1/72C02F101/34C02F101/36
CPCB01J23/06B01J23/34B01J23/745B01J23/75B01J23/755B01J27/24B01J35/0046B01J37/084C02F1/725C02F2101/34C02F2101/345C02F2101/36
Inventor 崔培昕王玉军杨强刘存
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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