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

A high specific surface and surface modification technology, which is 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, achieving the effects of short reaction time, reduced impact, and increased porosity

Active Publication Date: 2017-02-22
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-area O-doped surface-modified silkworm-excrement-based microporous carbon material as well as preparation method and application thereof
  • High-specific-area O-doped surface-modified silkworm-excrement-based microporous carbon material as well as preparation method and application thereof
  • High-specific-area O-doped surface-modified silkworm-excrement-based microporous carbon material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of silkworm excrement-based microporous carbon material with high specific surface O-doping surface modification, 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 750°C at a heating rate of 5°C / min, kept at 750°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 700°C at a rate of 5°C / min, and kept at 700°C for 5.0h to carry out the p...

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 a high-specific-area O-doped surface-modified silkworm-excrement-based microporous carbon material as well as a preparation method and an application thereof. Firstly, silkworm excrement and water are mixed, swelled and freeze-dried, and carbonized silkworm excrement is prepared from the freeze-dried silkworm excrement in the protective gas; the carbonized silkworm excrement and KOH are mixed and subjected to an activation pore enlargement reaction in the protective gas, a high-specific-area silkworm-excrement-based microporous carbon material is obtained after washing, centrifugation and drying, and the high-specific-area O-doped surface-modified silkworm-excrement-based microporous carbon material is prepared in a plasma reactor in the oxygen atmosphere and can be applied to sustained or controlled release of pesticides. The silkworm excrement is carbonized and activated under the protective gas condition at the high temperature, O-doped surface modification is performed on the material in the plasma modification manner, and the obtained carbon material has the higher specific surface area and controllable O-containing polar groups and can have the higher adsorption capacity and the better sustained or controlled release effect on the pesticides.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to an O-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): A01N25/08A01N51/00B01J20/20B01J20/30A01P7/04
Inventor 赵钟兴王欣辉陶萌良赵祯霞
Owner GUANGXI UNIV
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