A kind of graphene-coated silkworm sand porous carbon composite material and its preparation method and application

A technology of graphene coating and composite materials, which is 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, improve porosity and The effect of specific surface area

Active Publication Date: 2019-09-20
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 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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  • A kind of graphene-coated silkworm sand porous carbon composite material and its preparation method and application
  • A kind of graphene-coated silkworm sand porous carbon composite material and its preparation method and application
  • A kind of graphene-coated silkworm sand porous carbon composite material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of graphene-coated silkworm excrement porous carbon composite material, comprising the following steps,

[0036] (1) The original silkworm excrement and the ZnCl of mass concentration 0.25g / mL 2 The solution was mixed and swollen at 30°C according to the plastid ratio of 1:100 for 3.0h, then the silkworm excrement was fished out, and the silkworm excrement was freeze-dried, first frozen at -20°C for 4h, and then cooled to -60°C for freezing. Dry for 24 hours to obtain freeze-dried silkworm excrement.

[0037] (2) freeze-dried silkworm excrement in N 2 In the atmosphere, the temperature was raised to 300°C at a rate of 5°C / min, and kept at 300°C for 5.0h to carry out the pore expansion reaction. After naturally cooling down to room temperature, the obtained solid was dissolved in 1mol / L HCl to wash and dissolve ZnCl 2, and then washed with deionized water to pH ≈ 7, then centrifuged, placed in an oven to dry overnight, and obtained the silkworm exc...

Embodiment 2

[0041] (1) The original silkworm excrement and the ZnCl of mass concentration 0.25g / mL 2 The solution was mixed and swollen at 35°C according to the plastid ratio of 1:120 for 2.5 hours, and then the silkworm excrement was fished out, and the silkworm excrement was freeze-dried. It was first frozen at -20°C for 3 hours, and then cooled to -55°C. Dry for 36 hours to obtain freeze-dried silkworm excrement.

[0042] (2) Raise the freeze-dried silkworm excrement to 350°C at a heating rate of 5°C / min in an Ar atmosphere, and keep it at 350°C for 4.0h to carry out the pore expansion reaction. After naturally cooling down to room temperature, dissolve the obtained solid Wash and dissolve ZnCl in 1mol / L HCl 2 , and then washed with deionized water to pH ≈ 7, then centrifuged, placed in an oven to dry overnight, and obtained the silkworm excrement-based hierarchical porous carbon material after drying.

[0043] (3) Mix 1.0g silkworm excrement-based hierarchical porous carbon material...

Embodiment 3

[0046] (1) The original silkworm excrement and the ZnCl of mass concentration 0.30g / 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 excrement was fished out, and the silkworm excrement was freeze-dried, firstly frozen at -25°C for 2h, and then cooled to -50°C for freezing. Dry for 48 hours to obtain freeze-dried silkworm excrement.

[0047] (2) freeze-dried silkworm excrement in N 2 In the atmosphere, the temperature was raised to 400°C at a rate of 5°C / min, and kept at 400°C for 3.0h to carry out the pore expansion reaction. After the natural temperature dropped to room temperature, the obtained solid was dissolved in 1mol / L HCl to wash and dissolve ZnCl 2 , and then washed with deionized water to pH ≈ 7, then centrifuged, placed in an oven to dry overnight, and obtained the silkworm excrement-based hierarchical porous carbon material after drying.

[0048] (3) 1.0g silkworm excrement-based hierarchical...

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Abstract

The invention discloses a graphene coated silkworm excrement porous carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: mixing and swelling silkworm excrements and ZnCl2 solution, and performing freeze drying; carrying out an activating and pore enlarging reaction on the freeze-dried silkworm excrements in protective gases; cleaning, centrifuging and drying, thereby obtaining a silkworm excrement based porous carbon material; mixing graphene oxide solution with the silkworm excrement based porous carbon material, and performing centrifugal drying, thereby obtaining a graphene oxide coated silkworm excrement based porous carbon material; and adding the material into a plasma reactor, and introducing into an H2 atmosphere, thereby obtaining the graphene coated silkworm excrement porous carbon composite material. The material can be applied to aspect of pesticide sustained release. The material disclosed by the invention has high specific surface area and a graphene coated core-shell structure, and can achieve high adsorption capacity and excellent sustained-release effects on pesticides.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a graphene-coated silkworm excrement porous carbon 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 function of pes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/08A01N51/00
Inventor 赵祯霞朱梅萍胡鹏赵钟兴
Owner GUANGXI UNIV
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