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High-specific-surface-area basic oxide surface-modified silkworm faeces-based microporous carbon material and preparation method and application thereof

A basic oxide, high specific surface 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., to improve the generation reaction speed, short reaction time, improve Effect of Porosity and Specific Surface Area

Active Publication Date: 2016-12-07
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 basic oxide surface-modified silkworm faeces-based microporous carbon material and preparation method and application thereof
  • High-specific-surface-area basic oxide surface-modified silkworm faeces-based microporous carbon material and preparation method and application thereof
  • High-specific-surface-area basic oxide surface-modified silkworm faeces-based microporous carbon material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a silkworm excrement-based microporous carbon material modified on the surface of a high specific surface alkaline oxide, 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 700°C at a heating rate of 5°C / min, kept at 700°C for more than 2.0 hours, and then cooled to room temperature to prepare carbonized silkworm excrement.

[0040] (2) Combine carbonized silkworm excrement and KOH 2 Mixed at a mass ratio of 1:1, at N 2 In the atmosphere, the temperature was raised to 650°C at a rate of 5°C / min, and kept at 650°...

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) Combine carbonized silkworm excrement and KOH 2 Mixed at a mass ratio of 1:2, in N 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 t...

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) Combine carbonized silkworm excrement and KOH 2 Mixed at a mass ratio of 1:3, in N 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 wat...

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Abstract

The invention discloses a high-specific-surface-area basic oxide surface-modified silkworm faeces-based microporous carbon material and a preparation method and application thereof. The preparation method comprises the following steps: mixing and swelling silkworm faeces and water to obtain a mixture, performing freeze drying on the mixture, and preparing carbonized silkworm faeces from the freeze-dried silkworm faeces under protection gas; mixing the carbonized silkworm faeces with KOH, performing activating and reaming reaction in the protection gas, and then performing cleaning, centrifugation and drying to obtain a high-specific-surface-area silkworm faeces-based microporous carbon material; stirring and mixing a metal salt solution with the material, performing centrifugation and drying, and feeding oxygen to prepare a plasma modified basic oxide surface-modified silkworm faeces-based microporous carbon material. The material is applied to the aspect of controlled release of pesticides. According to the preparation method, the silkworm faeces can be carbonized and activated at high temperature under the condition of the protection gas, and basic oxide surface modification is carried out by a soaking method and a plasma modification mode, so that the obtained carbon material is higher in specific surface area and alkaline adsorption site, and has higher adsorption capacity for the pesticides and a better controlled release effect of the pesticides.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to an alkaline 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 fun...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30
CPCB01J20/20B01J20/28066B01J20/28069
Inventor 赵钟兴魏雅男孙华菊赵祯霞
Owner GUANGXI UNIV
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