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Graphene-like biochar for removing heavy metals and preparation method of graphene-like biochar

A biochar and graphene technology, applied in the preparation/purification of graphene and carbon, chemical instruments and methods, etc., can solve the problems of high production cost, low output, and demand

Active Publication Date: 2021-06-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these functional modification treatment methods all have problems such as high preparation cost, harsh reaction conditions, low yield, and the need to use toxic and harmful reagents during the reaction process.

Method used

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  • Graphene-like biochar for removing heavy metals and preparation method of graphene-like biochar
  • Graphene-like biochar for removing heavy metals and preparation method of graphene-like biochar
  • Graphene-like biochar for removing heavy metals and preparation method of graphene-like biochar

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the present embodiment, a kind of preparation method of the graphene-like biochar that is used for heavy metal removal comprises the following steps:

[0035] a. Utilize the petals of magnolia flower as a biochar carbon source material, wash and dry the collected petals, and set aside;

[0036] b. The petal carbon source obtained in step a is placed in the cysteine ​​aqueous solution, and the petal and the sulfur nitrogen compound are fully mixed according to the ratio of the mass ratio of the petal to the cysteine ​​water as the carbon source being 2:1 Finally, place in a vacuum oven at 60°C and dry overnight to obtain a mixture;

[0037] c. placing the mixture obtained in step b in a quartz boat, and performing a pyrolysis reaction at 700° C. for 4 hours under an argon atmosphere to obtain a black solid product;

[0038] d. Put the black solid product obtained in step c into an aqueous solution of nitric acid with a concentration of 6 mol / L, and perform an acidifi...

Embodiment 2

[0048] This embodiment is basically the same as Embodiment 1, especially in that:

[0049] A preparation method for graphene-like biochar for heavy metal removal, comprising the following steps:

[0050] a. Utilize the petals of magnolia flower as a biochar carbon source material, wash and dry the collected petals, and set aside;

[0051] b. The petal carbon source obtained in step a is placed in the cysteine ​​aqueous solution, and the petal and the sulfur nitrogen compound are fully mixed according to the mass ratio of the petal as the carbon source and the cysteine ​​water as 1:1 Finally, place in a vacuum oven at 60°C and dry overnight to obtain a mixture;

[0052] c. placing the mixture obtained in step b in a quartz boat, and performing a pyrolysis reaction at 600° C. for 3 hours under an argon atmosphere to obtain a black solid product;

[0053] d. Put the black solid product obtained in step c into an aqueous nitric acid solution with a concentration of 5 mol / L, and ...

Embodiment 3

[0059] This embodiment is basically the same as the previous embodiment, and the special features are:

[0060] A preparation method for graphene-like biochar for heavy metal removal, comprising the following steps:

[0061] a. Utilize the petals of magnolia flower as a biochar carbon source material, wash and dry the collected petals, and set aside;

[0062] b. The petal carbon source obtained in step a is placed in the cysteine ​​aqueous solution, and the petal and the sulfur nitrogen compound are fully mixed according to the ratio of the mass ratio of the petal to the cysteine ​​water as the carbon source being 3:1 Finally, place in a vacuum oven at 60°C and dry overnight to obtain a mixture;

[0063] c. placing the mixture obtained in step b in a quartz boat, and performing a pyrolysis reaction at 800° C. for 5 hours under an argon atmosphere to obtain a black solid product;

[0064] d. Put the black solid product obtained in step c into an aqueous nitric acid solution w...

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Abstract

The invention discloses a preparation method of graphene-like biochar for removing heavy metals. Plant petals widely existing in nature are used as a biochar carbon source, dual regulation and control of components and a microstructure of the biochar are successfully realized by means of pyrolysis, acidification oxidation, strong alkali activation and the like, and the nitrogen and sulfur co-doped graphene-like carbon material is synthesized. The material prepared by the method has the microstructure physical characteristic of large specific surface area of a graphene material, and the surface of the material is rich in sulfur-nitrogen functional groups such as sulfydryl and amino, so that a heavy metal adsorption experiment proves that the prepared material has a relatively good adsorption effect on lead ions and cadmium ions in an aqueous solution. According to the preparation method disclosed by the invention, plants widely existing in the nature are selected as carbon sources, the production cost is low, the preparation method can be realized in a conventional laboratory, the industrialization prospect is good, the preparation efficiency is high, toxic and harmful reagents are not used in the preparation process, and the method is environment-friendly, so that the method has extremely wide application prospects in the field of adsorption material preparation.

Description

technical field [0001] The invention relates to a preparation method of graphene-like bio-carbon used for removing heavy metals, and belongs to the field of nano-adsorption materials. Background technique [0002] In recent years, with the rapid development of industry, agriculture and economy, a large amount of untreated urban garbage, industrial wastewater, domestic sewage, and atmospheric sediments have been continuously discharged into the water, resulting in increasingly serious heavy metal pollution in water bodies. At present, the most concerned heavy metals in environmental pollution research mainly include lead, cadmium, mercury, chromium and so on. Compared with the toxicity of other pollutants, heavy metal pollution has the characteristics of concealment, long-term, irreversible, etc., and is easy to be enriched by organisms, and endangers human health through the food chain. Therefore, the treatment of heavy metal pollution in water has attracted much attention....

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B32/184B01J20/20
CPCC01B32/05C01B32/184B01J20/20
Inventor 程伶俐何新华王浩王佳琪焦正
Owner SHANGHAI UNIV
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