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High-specific-surface-area N-doped surface-modified silkworm excrement-based microporous carbon material and preparation method and application thereof

A high specific surface and surface modification technology, applied in the field of carbon materials, can solve the problems of excessive pesticide residues in agricultural products, non-target biological damage to the environment, and low efficiency of pesticide utilization, etc., to achieve good slow and controlled release, high specific surface area, and improved porosity The effect of rate and specific surface area

Active Publication Date: 2017-01-11
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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  • High-specific-surface-area N-doped surface-modified silkworm excrement-based microporous carbon material and preparation method and application thereof
  • High-specific-surface-area N-doped surface-modified silkworm excrement-based microporous carbon material and preparation method and application thereof
  • High-specific-surface-area N-doped surface-modified silkworm excrement-based microporous carbon material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing a high specific surface N-doped surface-modified silkworm excrement-based microporous carbon material, comprising the following steps,

[0035] (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.

[0036] in N 2 In the atmosphere, 10.0 g of freeze-dried silkworm excrement was raised to 700°C at a heating rate of 5°C / min, kept at 700°C for more than 3 hours, and then cooled to room temperature to prepare carbonized silkworm excrement.

[0037] (2) Mix carbonized silkworm excrement and KOH at a mass ratio of 1:1, 2 In the atmosphere, the temperature was raised to 650°C at a rate of 5°C / min, and kept at 650°C for 5.0h to carry out the pore expan...

Embodiment 2

[0040] (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.

[0041] 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 2.5h, and then cooled to room temperature to prepare carbonized silkworm excrement.

[0042] (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, cent...

Embodiment 3

[0045] (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.

[0046] 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 2.0 hours, and then cooled to room temperature to prepare carbonized silkworm excrement.

[0047] (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...

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Abstract

The invention discloses high-specific-surface-area N-doped surface-modified silkworm excrement-based microporous carbon material and a preparation method and application thereof; silkworm excrement and water are mixed and swelled and then lyophilized, the lyophilized silkworm excrement is then prepared into carbonized silkworm excrement under a protective gas, the carbonized silkworm excrement is then mixed with KOH, mixture is subjected to activation and pore-enlarging reaction in the protective gas and is then washed, centrifuged and dried to obtain the high-specific-surface-area silkworm excrement-based microporous carbon material, and N2 atmosphere is then introduced into a plasma reactor to prepare the high-specific-surface-area N-doped surface-modified silkworm excrement-based microporous carbon material; the material is applicable to pesticide release control; silkworm excrement is carbonized and activated at high temperature in the protective gas, the material is subjected to N-doped surface modification by means of plasma modification, and the obtained carbon material has high specific surface area and controllable N-containing polar groups and has high adsorbing capacity and good release control effect for pesticides.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to an N-doped surface-modified silkworm excrement-based microporous carbon 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 func...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30A01N25/08
CPCA01N25/08B01J20/20B01J20/28066B01J20/28095B01J2220/4887
Inventor 赵钟兴魏雅男孙华菊赵祯霞
Owner GUANGXI UNIV
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