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
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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
Description
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Application Information
- IPC
- A01N25/08; A01N51/00
- Inventors
- 赵祯霞; 朱梅萍