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Graphene silkworm excrement microporous carbon core-shell composite material as well as preparation and application thereof

A composite material and microporous carbon technology, applied in the field of carbon materials, can solve the problems of non-target biological damage environment, excessive pesticide residues in agricultural products, low pesticide utilization efficiency, etc., achieve short reaction time, reduce impact, and increase porosity.

Active Publication Date: 2017-05-10
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only a small amount of pesticides can reach the crop target site in a specific time, and most of the pesticides are directly released into the natural environment, resulting in low pesticide utilization efficiency
These ineffective pesticides will cause many negative problems such as excessive pesticide residues in agricultural products, damage to non-target organisms, and environmental pollution.

Method used

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  • Graphene silkworm excrement microporous carbon core-shell composite material as well as preparation and application thereof
  • Graphene silkworm excrement microporous carbon core-shell composite material as well as preparation and application thereof
  • Graphene silkworm excrement microporous carbon core-shell composite material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of graphene silkworm excrement microporous carbon core-shell composite material, comprising the following steps,

[0038] (1) Mix and swell the original silkworm excrement and deionized water according to the mass-to-body ratio of 1:100. After swelling at 30°C for 3.0 hours, remove the silkworm excrement and freeze-dry it. First, freeze and pretreat at -20°C for 4 hours. Then lower the temperature to -60° C. and freeze-dry for 24 hours to obtain freeze-dried silkworm excrement.

[0039] in N 2 In the atmosphere, 10.0 g of freeze-dried silkworm excrement was raised to 750°C at a heating rate of 5°C / min, kept at 750°C for more than 2.0 hours, and then cooled to room temperature to prepare carbonized silkworm excrement.

[0040] (2) Mix carbonized silkworm excrement and KOH at a mass ratio of 1:1, 2In the atmosphere, the temperature was raised to 700°C at a rate of 5°C / min, and kept at 700°C for 5.0h to carry out the pore expansion reaction. After co...

Embodiment 2

[0044] (1) Mix and swell the original silkworm excrement and deionized water according to the mass-to-body ratio of 1:120. After swelling at 35°C for 2.5 hours, remove the silkworm excrement and freeze-dry it. First, freeze it at -20°C for 3 hours. Then lower the temperature to -55° C. and freeze-dry for 36 hours to obtain freeze-dried silkworm excrement.

[0045] In an Ar atmosphere, 10.0 g of freeze-dried silkworm excrement was raised to 800 °C at a heating rate of 5 °C / min, kept at 800 °C for more than 2.0 h, and then cooled to room temperature to prepare carbonized silkworm excrement.

[0046] (2) Mix carbonized silkworm excrement and KOH at a mass ratio of 1:2, 2 In the atmosphere, the temperature was raised to 750°C at a rate of 5°C / min, and kept at 750°C for 4.0h to carry out the pore expansion reaction. After cooling down to room temperature naturally, the obtained solid was dissolved in 1mol / L HCl to wash and dissolve KOH. Then use deionized water to wash to pH ≈ 7, ...

Embodiment 3

[0050] (1) Mix and swell the original silkworm excrement and deionized water according to the plastid ratio of 1:140, swell at 40°C for 2.0 hours, remove the silkworm excrement and freeze-dry it, and first freeze and pretreat it at -25°C for 2 hours, Then lower the temperature to -50° C. and freeze-dry for 48 hours to obtain freeze-dried silkworm excrement.

[0051] in N 2 In the atmosphere, 10.0 g of freeze-dried silkworm excrement was raised to 850°C at a heating rate of 5°C / min, kept at 850°C for more than 3.0h, and then cooled to room temperature to prepare carbonized silkworm excrement.

[0052] (2) Mix carbonized silkworm excrement and KOH at a mass ratio of 1:3, 2 In the atmosphere, the temperature was raised to 800°C at a rate of 5°C / min, and kept at 800°C for 3.0h to carry out the pore expansion reaction. After cooling down to room temperature naturally, the obtained solid was dissolved in 1mol / L HCl to wash and dissolve KOH. Then use deionized water to wash to pH ≈...

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Abstract

The invention discloses a graphene silkworm excrement microporous carbon core-shell composite material as well as a preparation and an application thereof. Silkworm excrement and water are mixed and swelled, freeze drying is carried out, and after freeze-drying, the silkworm excrement is prepared into carbonized silkworm excrement with shielding gas; the carbonized silkworm excrement and KOH are mixed, activation and hole enlarging reaction is carried out with shielding gas, an oxidized graphene solution and a silkworm excrement based microporous carbon material are mixed, and centrifugation and drying are carried out in order to obtain an oxidized graphene silkworm excrement microporous carbon core-shell composite material; the material is placed in a plasma reactor, H2 atmosphere is introduced, and the graphene silkworm excrement microporous carbon core-shell composite material is prepared. The material can be applied to the aspect of sustained and controlled release of pesticide. The material has a high specific surface area and a core-shell structure covered by graphene, and has high adsorption capacity and good sustained and controlled release effects for pesticide.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a graphene silkworm excrement microporous carbon core-shell composite material and a preparation method and application thereof. Background technique [0002] Pesticides can effectively control the harm of diseases, insects, weeds and other harmful organisms to crops. As an important means of chemical control, pesticides play an irreplaceable role in agricultural production. However, only a small amount of pesticides can reach the crop target site in a specific time, and most of the pesticides are directly released into the natural environment, resulting in low pesticide utilization efficiency. These ineffective pesticides will cause many negative problems such as excessive pesticide residues in agricultural products, damage to non-target organisms, and environmental pollution. How to effectively improve the utilization efficiency and targeted release functi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30A01N25/08A01N51/00
CPCA01N25/08A01N51/00B01J20/20B01J20/28066B01J20/28073
Inventor 赵祯霞周凯彬孙晓丹赵钟兴
Owner GUANGXI UNIV
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