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Coal gangue in-situ carbon activation material as well as preparation method and application thereof

A coal gangue and carbon activation technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of low activation efficiency, high cost, cumbersome preparation, etc. To achieve the effect of improving degradation performance, high efficiency and increasing economic value

Active Publication Date: 2021-06-08
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned carbon-based persulfate activation material is expensive in raw material cost, cumbersome to prepare, and low in activation efficiency, making it difficult to use in actual water body and site treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The invention provides a method for preparing coal gangue in-situ carbon activation material, comprising the following steps:

[0020] The coal gangue is sequentially subjected to mechanical activation, chemical activation, calcination and functional group grafting to obtain the coal gangue in-situ carbon activation material.

[0021] In the present invention, in terms of mass content, the carbon content in the gangue is preferably 10-30%, more preferably 15-25%; the kaolinite content in the gangue is preferably >60%, more preferably Preferably >70%. The invention limits the components in the gangue to the above-mentioned range, can make full use of the carbon content and the aluminosilicate skeleton structure of the gangue, and further realize the in-situ carbon activation of the gangue.

[0022] In the present invention, the mechanical activation method is preferably crushing and grinding. The present invention has no special limitation on the specific operation mod...

Embodiment 1

[0040] The preparation method of coal gangue in-situ carbon activation material consists of the following steps:

[0041] (1) Select coal gangue with a carbon content of 20% and a kaolinite content > 60%. After primary crushing of the gangue, the crushed gangue is added to a high-speed dispersing grinder for grinding mechanical activation until The fineness is -100 mesh, the peeling rate is more than 70%, and the coal gangue after mechanical activation is obtained;

[0042] (2) Put the mechanically activated coal gangue obtained in the step (1) into 5M hydrochloric acid solution for acid leaching treatment, the temperature of the acid leaching treatment is 60°C, and the treatment time is 2h, and the chemically activated gangue is obtained. coal gangue;

[0043] (3) Put the chemically activated coal gangue obtained in the step (2) into a nitrogen atmosphere, control the gas flow rate to 0.5mL / min, heat up to 400°C at a heating rate of 5°C / min for calcination, and calcine The ...

Embodiment 2

[0046] The preparation method of coal gangue in-situ carbon activation material consists of the following steps:

[0047] (1) Select coal gangue with a carbon content of 25% and a kaolinite content > 60%. After primary crushing of the gangue, the crushed gangue is added to a high-speed dispersing grinder for mechanical activation until The fineness is -100 mesh, the peeling rate is more than 70%, and the coal gangue after mechanical activation is obtained;

[0048] (2) Put the mechanically activated coal gangue obtained in the step (1) into 5M nitric acid solution for acid leaching treatment, the temperature of the acid leaching treatment is 60°C, and the treatment time is 2h, and the chemically activated gangue is obtained. coal gangue;

[0049] (3) Put the chemically activated coal gangue obtained in the step (2) into a nitrogen atmosphere, control the gas flow rate to 0.5mL / min, heat up to 500°C at a heating rate of 5°C / min for calcination, and calcine The time is 4 hours...

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Abstract

The invention provides a coal gangue in-situ carbon activation material as well as a preparation method and application thereof, and belongs to the technical field of catalytic materials. The invention provides a preparation method of a coal gangue in-situ carbon activation material, which comprises the following steps: sequentially carrying out mechanical activation, chemical activation, calcination and functional group grafting treatment on coal gangue to obtain the coal gangue in-situ carbon activation material. The calcining atmosphere is inert atmosphere. The functional group in the functional group grafting treatment is at least one of hydroxyl, sulfydryl, amino, carboxyl, sulfonic group and acylamino. The result of the embodiment shows that when the addition amount of the coal gangue in-situ carbon activation material prepared by the preparation method provided by the invention is 0.5 g / L, the degradation rate of phenol (25mg / L) for 10 minutes exceeds 87%, and the degradation rate of naphthalene (10mg / L) for 10 minutes exceeds 85%.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a coal gangue in-situ carbon activation material and its preparation method and application. Background technique [0002] In recent years, the pollution problem in coal-related industrial clusters has received widespread attention. In coal industry clusters, solid waste such as coal gangue will be generated during coal mining, washing and processing, power generation, coking, coal gasification, and waste stacking, accompanied by serious pollution of the site, surface water, and groundwater. Especially polycyclic aromatic hydrocarbon organic pollutants, including phenol, naphthalene, phenanthrene, anthracene, benzopyrene, etc., have caused serious damage to the ecological environment of industrial regions. Therefore, it is imminent to remediate the organic pollutants in the soil and groundwater of typical polluted sites in coal-related industrial clusters. [0003] ...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J27/02B01J31/02B01J31/04B01J37/06B01J37/08C02F9/04C02F101/30C02F101/34C02F101/32
CPCB01J21/18B01J27/02B01J31/0202B01J31/0217B01J31/0225B01J31/0237B01J31/0247B01J31/04B01J37/06B01J37/082B01J37/0036C02F1/722C02F1/725C02F1/44C02F2101/345C02F2101/30C02F2101/327C02F2305/023
Inventor 孙志明李春全郑水林
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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