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A kind of alkaline oxide surface modified silkworm excrement based hierarchical porous carbon material and its preparation method and application

A basic oxide and surface modification 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., and achieve easy control, convenient operation, and improved porosity and ratio. The effect of surface area

Active Publication Date: 2019-02-01
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 alkaline oxide surface modified silkworm excrement based hierarchical porous carbon material and its preparation method and application
  • A kind of alkaline oxide surface modified silkworm excrement based hierarchical porous carbon material and its preparation method and application
  • A kind of alkaline oxide surface modified silkworm excrement based hierarchical porous carbon material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0035] A method for preparing a silkworm excrement-based hierarchical porous carbon material modified on the surface of an alkaline oxide, comprising the following steps,

[0036] (1) The original silkworm excrement and the ZnCl of mass concentration 0.25g / mL 2The 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 o...

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) Combine the silkworm excrement-based hierarchical porous carbon mater...

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) Combine the silkworm excrement-based hiera...

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Abstract

The invention discloses an alkaline oxide surface modifying silkworm excrement based hierarchical pore carbon material and a preparation method and application thereof. the preparation method includes: mixing silkworm excrement with ZnCl2 solution for swelling, and lyophilizing; enabling the silkworm excrement to be in activation chambering reaction in protection gas after lyophilizing; washing, centrifuging, and drying to obtain a silkworm excrement based hierarchical pore carbon material; stirring and mixing a metal salt solution with the material, centrifuging, drying, and feeding oxygen to prepare a plasma modified alkaline oxide surface modifying silkworm excrement based hierarchical pore carbon material. The material can be applied in the aspect of pesticide controlled-release. A protection gas condition is utilized to activate the silkworm excrement at high temperature, and alkaline oxide surface modifying is performed on the material through an impregnation method and a plasma modifying mode, so that the carbon material has large specific surface area and alkaline adsorption site and can have high adsorption capacity and good controlled-release effect on pesticide.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a silkworm excrement-based hierarchical porous carbon material modified on the surface of an alkaline oxide 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 efficienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30A01N51/00A01N25/08A01P7/04
CPCA01N25/08A01N51/00B01J20/20B01J20/28066B01J20/28095B01J2220/4887A01N2300/00
Inventor 赵钟兴王欣辉陶萌良赵祯霞
Owner GUANGXI UNIV
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