Method for preparing multi-element-doped carbon materials by utilizing Chinese chives

A leek, co-doping technology, applied in the fields of nanotechnology, nanocarbon, nanotechnology, etc. for materials and surface science, to achieve the effects of simple operation, uniform size, and low equipment requirements

Inactive Publication Date: 2018-06-01
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using leeks as raw materials to obtain two new carbon materia

Method used

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  • Method for preparing multi-element-doped carbon materials by utilizing Chinese chives
  • Method for preparing multi-element-doped carbon materials by utilizing Chinese chives
  • Method for preparing multi-element-doped carbon materials by utilizing Chinese chives

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Chop fresh leek leaves, wash them, and dry them. Weigh 6 grams of dried leek leaves, 20 ml of concentrated ammonia water with a concentration of 25% and 40 ml of ultrapure water, add them to a hydrothermal kettle, and heat them in an oven at 220 ° C. After 12 hours of hydrothermal reaction, take out the hydrothermal reaction kettle, cool it down to 25°C naturally, pour out the reaction solution in the hydrothermal reaction kettle; centrifuge at a low speed of 3000r / min for 30 minutes, collect the supernatant Then continue to use 16000r / min high-speed centrifugation for 5 minutes, collect the supernatant again; use 0.45 micron, 0.22 micron, 0.1 micron mixed cellulose lipid (water system) microporous membranes to filter and purify in turn to obtain nitrogen , sulfur and phosphorus co-doped carbon quantum dot solution. The carbon quantum dot solution was sampled and placed in a refrigerator at 4°C for low temperature storage. After one year of observation, it was found tha...

Embodiment 2

[0033] Chop fresh leek leaves, wash them, and dry them. Weigh 6 grams of dried leek leaves, 25 ml of concentrated ammonia water with a concentration of 28% and 45 ml of ultrapure water, add them to a hydrothermal kettle, and heat them in an oven at 150°C Hydrothermal for 48 hours, after the hydrothermal reaction is over, take out the hydrothermal kettle, cool it down to 20°C naturally, then pour out the reaction solution in the hydrothermal reaction kettle; centrifuge at a low speed of 3500r / min for 25 minutes, collect the supernatant Then continue to use 14000r / min high-speed centrifugation for 8 minutes, and collect the supernatant again; use 0.45 micron, 0.22 micron, 0.1 micron mixed cellulose lipid (water system) microporous membranes to filter and purify successively to obtain nitrogen , sulfur and phosphorus co-doped carbon quantum dot solution. The carbon quantum dot solution was sampled and placed in a refrigerator at 4°C for low temperature storage. After one year of ...

Embodiment 3

[0038] Fresh leek leaves are chopped, washed, and dried. Weigh 6 grams of dried leek leaves, 25 ml of concentrated ammonia water with a concentration of 27% and 45 ml of ultrapure water, add them to a hydrothermal kettle, and heat them in an oven at 200 ° C. Hydrothermal for 24 hours, after the hydrothermal reaction is over, take out the hydrothermal kettle, cool it naturally at 23°C, then pour out the reaction liquid in the hydrothermal reaction kettle; centrifuge at a low speed of 4000r / min for 15 minutes, and collect the supernatant , and then continue to use 12000r / min high-speed centrifugation for 15 minutes, and collect the supernatant again; successively use 0.45 micron, 0.22 micron, 0.1 micron mixed cellulose resin (water system) microporous filter membranes to filter and purify to obtain nitrogen, Sulfur and phosphorus co-doped carbon quantum dot solution. The carbon quantum dot solution was sampled and placed in a refrigerator at 4°C for low temperature storage. Afte...

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Abstract

The invention provides a method for preparing multi-element-doped carbon materials by utilizing Chinese chives. The method comprises the following steps: adding Chinese chives together with ammonia water and ultra-pure water to a hydrothermal reaction kettle to be subjected to hydrothermal reaction; after the hydrothermal reaction is finished, performing natural cooling, and then pouring out the reaction liquid in the hydrothermal reaction kettle; and performing centrifugation, filtration and freeze drying to obtain nitrogen, sulfur and phosphorus co-doped carbon quantum dots. The raw materials used in the method provided by the invention are cheap and easily available, and carbon nanorod materials are also obtained while carbon quantum dot materials are prepared, so that efficient utilization of common biomass resources is realized. The preparation method provided by the invention has the advantages of low cost, greenness and environmental protection, simple operation, low requirements for equipment, and convenience for large-scale preparation and industrial production; the obtained carbon quantum dots have the advantages of good water solubility, high purity, good dispersibility,uniform size, high stability and high heteroatom doping content, wherein the nitrogen content is as high as 6.8%, the sulfur content is as high as 5.2%, and the phosphorus content is as high as 4.5%;and an obtained macroporous carbon material has a large pore structure dimensionally and mutually communicated.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a method for preparing a multi-element-doped carbon quantum dot material by using leek as a carbon source, and simultaneously effectively utilizing the residue generated in the preparation process of the carbon quantum dot to prepare a carbon nanorod material. Background technique [0002] Quantum dots are quasi-zero-dimensional nanomaterials whose particle size is generally below 10 nanometers. Due to its unique quantum size effect and surface effect, it has more excellent optical properties than traditional organic fluorescent dyes: smaller volume, wider excitation spectrum, highly tunable photoluminescence properties, special multi-photon excitation (up-conversion) properties, excellent light resistance, stable fluorescence intensity, etc. However, because traditional quantum dots mostly contain heavy metal elements such as Cd and Te, there are varying ...

Claims

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Application Information

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IPC IPC(8): C01B32/15B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00
Inventor 刘玉荣张宗强
Owner CHONGQING UNIV OF ARTS & SCI
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