N-doping surface modification silkworm excrement-based multi-stage hole carbon material and preparation method and application thereof

A surface modification and multi-level pore technology, applied in the field of carbon materials, can solve problems such as pollution, low efficiency of pesticide utilization, non-target biological damage to the environment, etc., and achieve high adsorption capacity, increase porosity and specific surface area.

Active Publication Date: 2017-03-08
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 util

Method used

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  • N-doping surface modification silkworm excrement-based multi-stage hole carbon material and preparation method and application thereof
  • N-doping surface modification silkworm excrement-based multi-stage hole carbon material and preparation method and application thereof
  • N-doping surface modification silkworm excrement-based multi-stage hole carbon material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A preparation method of N-doped surface modified silkworm sand-based hierarchical porous carbon material, comprising the following steps:

[0034] (1) Mix the original silkworm sand with ZnCl with a mass concentration of 0.25 g / mL 2 The solution was mixed and swelled at 30°C according to the plastid ratio of 1:100 for 3.0h, and then the silkworm sand was taken out, and the silkworm sand was freeze-dried. It was first frozen at -20°C for 4 hours, and then cooled to -60°C for freezing. After drying for 24 hours, the lyophilized silkworm sand was obtained.

[0035] (2) Freeze-dried silkworm sand in N 2 The temperature was raised to 300°C at a heating rate of 5°C / min in the atmosphere, and the pore expansion reaction was carried out at 300°C for 5.0 h. After naturally cooling to room temperature, the obtained solid was dissolved in 1 mol / L HCl to wash and dissolve ZnCl. 2 , and then washed with deionized water to pH ≈ 7, centrifuged, placed in an oven to dry overnight, an...

Embodiment 2

[0038] (1) Mix the original silkworm sand with ZnCl with a mass concentration of 0.25 g / mL 2 The solution was mixed and swelled at 35°C according to the plastid ratio of 1:120 for 2.5 hours, and then the silkworm sand was taken out, and the silkworm sand was freeze-dried. It was first frozen at -20°C for 3 hours, and then cooled to -55°C for freezing. After drying for 36 hours, the lyophilized silkworm sand was obtained.

[0039] (2) The lyophilized silkworm sand was raised to 350°C at a heating rate of 5°C / min in an Ar atmosphere, and kept at 350°C for 4.0 h for pore-expansion reaction. After naturally cooling to room temperature, the obtained solid was dissolved in Wash and dissolve ZnCl in 1mol / L HCl 2 , and then washed with deionized water to pH ≈ 7, centrifuged, placed in an oven to dry overnight, and dried to obtain a silkworm sand-based hierarchical porous carbon material.

[0040] (3) Put 1.0g silkworm sand-based hierarchical porous carbon material into the plasma re...

Embodiment 3

[0042] (1) Mix the original silkworm sand with ZnCl with a mass concentration of 0.30 g / mL 2 The solution was mixed and swollen at 40°C according to the plastid ratio of 1:140 for 2.0h, and then the silkworm sand was taken out, and the silkworm sand was freeze-dried. It was first frozen at -25°C for 2 hours, and then cooled to -50°C for freezing. After drying for 48 hours, the lyophilized silkworm sand was obtained.

[0043] (2) Freeze-dried silkworm sand in N 2 In the atmosphere, the temperature was raised to 400°C at a heating rate of 5°C / min, and kept at 400°C for 3.0 h for pore expansion reaction. After naturally cooling to room temperature, the obtained solid was dissolved in 1 mol / L HCl to wash and dissolve ZnCl. 2 , and then washed with deionized water to pH ≈ 7, centrifuged, placed in an oven to dry overnight, and dried to obtain a silkworm sand-based hierarchical porous carbon material.

[0044] (3) Put 1.0g silkworm sand-based hierarchical porous carbon material in...

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Abstract

The invention discloses an N-doping surface modification silkworm excrement-based multi-stage hole carbon material and a preparation method and application thereof. Firstly, silkworm excrement and ZnCl2 solution are subjected to mixed swelling; then, freeze drying is performed; the silkworm excrement subjected to freeze drying is subjected to activation hole expansion reaction in protection gas; next, cleaning, centrifugation and drying are performed to obtain a silkworm excrement-based microporous carbon material; next, N2 gas is introduced for preparing the N-doping surface modification silkworm excrement-based multi-stage hole carbon material in a plasma reactor; the material can be applied to the aspect of pesticide slow and controlled release. The protection gas condition is used for performing activation treatment at high temperature; then, by using a plasma modification mode, the material is subjected to N-doping surface modification, the obtained carbon material has high specific surface area and controllable N polar groups; high adsorption volume and good slow and controlled release effects are achieved.

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 sand-based hierarchical porous carbon material and a preparation method and application thereof. Background technique [0002] Pesticides can effectively control the damage of diseases, insects, grasses and other harmful organisms to crops. As an important means of chemical control, they play an irreplaceable role in agricultural production. However, only a small amount of pesticides can reach the target site of crops within a specific time, and most of the pesticides are directly released into the natural environment, resulting in low pesticide utilization efficiency. These unproductive pesticides will cause many negative problems such as excessive pesticide residues in agricultural products, harm to non-target organisms, and environmental pollution. How to effectively improve the utilization efficiency and targeted rele...

Claims

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Application Information

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IPC IPC(8): C01B32/05A01N25/08A01N51/00
CPCA01N25/08A01N51/00C01P2006/12C01P2006/14
Inventor 赵钟兴王欣辉陶萌良赵祯霞
Owner GUANGXI UNIV
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