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A kind of O-doped surface-modified silkworm excrement-based hierarchical porous carbon material and its preparation method and application

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 the effect of increasing porosity, specific surface area, and high adsorption capacity

Active Publication Date: 2019-04-12
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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  • A kind of O-doped surface-modified silkworm excrement-based hierarchical porous carbon material and its preparation method and application
  • A kind of O-doped surface-modified silkworm excrement-based hierarchical porous carbon material and its preparation method and application
  • A kind of O-doped surface-modified silkworm excrement-based hierarchical porous carbon material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of O-doped surface-modified silkworm excrement-based hierarchical porous carbon material, comprising the following steps,

[0035] (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.

[0036] (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 obtain...

Embodiment 2

[0039] (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.

[0040] (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.

[0041] (3) Put 1.0g silkworm excrement-based hierarchical porous carbon material...

Embodiment 3

[0043] (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.

[0044] (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.

[0045] (3) Put 1.0g silkworm excrement-based hierarch...

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Abstract

The invention discloses an oxygen-doped surface modification silkworm excrement based hierarchical pore carbon material and a preparation method and application thereof. The preparation method comprises the following steps: firstly carrying out freeze drying after mixed swelling of silkworm excrement and a ZnCl2 solution, then carrying out an excitation chambering reaction on the silkworm excrement after freeze drying in protective gas, then obtaining a silkworm excrement based hierarchical pore carbon material after cleaning, centrifuging and drying, and then introducing an oxygen gas atmosphere in a plasma reactor to prepare the oxygen-doped surface modification silkworm excrement based hierarchical pore carbon material; and the material can be applied to the aspect of pesticide controlled release. The condition of the protective gas is used for carrying out activating treatment on the silkworm excrement under high temperature, and then oxygen-doped surface modification is carried out on the material through a plastic modification manner, so that the obtained carbon material has relatively high specific surface area and controllable oxygen-containing polar groups and has relatively high adsorption capacity and relatively good controlled release effect for 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 hierarchical porous 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 rele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30A01N25/08
CPCA01N25/08B01J20/20B01J20/28064B01J20/28066B01J20/28071B01J20/28073B01J20/28088B01J20/28095B01J2220/4875
Inventor 赵钟兴魏雅男孙华菊赵祯霞
Owner GUANGXI UNIV
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