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A method for rapid and simultaneous preparation of lignin nanoparticles and carbon quantum dots

A nanoparticle and carbon quantum dot technology, applied in the field of rapid and synchronous preparation of lignin nanoparticles and carbon quantum dots, can solve the problems of difficult particle size control, complex process, harsh conditions, etc., and achieve high dispersibility and uniform particle size distribution. , the effect of simple operation

Active Publication Date: 2020-07-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there have been some reports on the preparation of lignin nanoparticles and carbon quantum dots, most of the methods involve complex processes and harsh conditions, the particle size is difficult to control, time-consuming (up to 3 days) and expensive, so it is difficult to promote application

Method used

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  • A method for rapid and simultaneous preparation of lignin nanoparticles and carbon quantum dots
  • A method for rapid and simultaneous preparation of lignin nanoparticles and carbon quantum dots
  • A method for rapid and simultaneous preparation of lignin nanoparticles and carbon quantum dots

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Effect test

Embodiment 1

[0036] (1) The rice straw is crushed and sieved through 60 mesh, washed twice with ultrapure water, and dried at 60°C to a constant weight.

[0037] (2) Put the rice straw treated in step (1) in a digestion tank, and add ethanol-water (ethanol:water 65:35) dissolved in HCl at a solid-liquid ratio of 1:10 (g / ml). v / v) The mixed solution is placed in a microwave oven (Galanz P70F20L-DG), and the treated solution is filtered after microwave treatment at 400 W for 10 minutes. The mass fraction of the HCl in the mixed solution is 0.5%.

[0038] (3) Centrifuge the obtained treatment solution at 12,000 rpm for 10 minutes, the resulting precipitate is lignin nanoparticles, and the supernatant is a nitrogen-doped carbon quantum dot solution.

[0039] The lignin nanoparticles (such as figure 1 ) Has an average particle size of 123nm, and the particle size distribution is relatively uniform (dispersion coefficient: 0.173, such as figure 2 ), with typical polyhydroxyl lignin structure (such as ...

Embodiment 2

[0041] (1) The rice straw is crushed and sieved through 60 mesh, washed twice with ultrapure water, and dried at 60°C to a constant weight.

[0042] (2) Put the rice straw treated in step (1) in a digestion tank, and add ethanol-water (ethanol:water 60:40) dissolved in HCl at a solid-liquid ratio of 1:15 (g / ml). v / v) The mixed solution is placed in a microwave oven (Galanz P70F20L-DG), and the treated solution is obtained by filtering after microwave treatment at 500 W for 8 minutes. The mass fraction of the HCl in the mixed solution is 0.5%.

[0043] (3) Centrifuge the obtained treatment solution at 14000 rpm for 5 minutes, the resulting precipitate is lignin nanoparticles, and the supernatant is a nitrogen-doped carbon quantum dot solution.

[0044] The average particle diameter of the lignin nanoparticles prepared by this embodiment is 156 nm (dispersion coefficient: 0.201), and has a typical polyhydroxy lignin structure. At the same time, the prepared nitrogen-doped carbon quant...

Embodiment 3

[0046] (1) The rice straw is crushed and sieved through 60 mesh, washed twice with ultrapure water, and dried at 60°C to a constant weight.

[0047] (2) Put the rice straw treated in step (1) in a digestion tank, and add ethanol-water (ethanol:water 70:30) dissolved in HCl at a solid-liquid ratio of 1:20 (g / ml). v / v) In the mixed solution, then placed in a microwave oven (Galanz P70F20L-DG), after 12 minutes of microwave treatment at 400W, filtered to obtain a treatment solution. The mass fraction of HCl in the mixed solution is 0.8%.

[0048] (3) Centrifuge the obtained treatment solution at 11000 rpm for 10 minutes, the obtained precipitate is lignin nanoparticles, and the supernatant is a nitrogen-doped carbon quantum dot solution.

[0049] The average particle diameter of the lignin nanoparticles prepared in this embodiment is 187 nm (dispersion coefficient: 0.165), and has a typical polyhydroxy lignin structure. At the same time, the prepared nitrogen-doped carbon quantum dots ...

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Abstract

The invention discloses a method for quickly synchronously preparing lignin nano-particles and carbon quantum dots. The method includes particular steps of adding abandoned biomass into acid solution,carrying out microwave treatment, and then separating solid from liquid to obtain treating fluid; centrifugally separating the treating fluid to obtain lower-layer precipitates and supernatant liquor. The lower-layer precipitates are the lignin nano-particles, the supernatant liquor is nitrogen-doped carbon quantum dot solution, and solvents in the acid solution are mixed solvents with ethyl alcohol. The method has the advantages that biomass nano-materials with different sizes can be quickly synchronously prepared from the abandoned biomass by the aid of the method and include the lignin nano-particles (with the sizes of 100 nm) and the fluorescent nitrogen-doped carbon quantum dots (with the sizes of 2-3 nm), and accordingly the universality of the traditional method for preparing the nano-materials can be greatly improved; the method is quick, green and simple and is low in cost, and industrial production can be facilitated.

Description

Technical field: [0001] The invention belongs to the field of biomass nanomaterial chemistry, and specifically relates to a method for rapidly and synchronously preparing lignin nanoparticles and carbon quantum dots. Background technique: [0002] Functional carbon-based nanomaterials are the key to solving the environmental and energy crisis due to their unique tunable properties (for example, thermal and electrical conductivity, high mechanical strength and optical properties). At this stage, increasing industrial demand has stimulated research on non-toxic, low-cost and environmentally friendly preparation methods. As the effective ingredient of agricultural and forestry waste, lignocellulose is the most abundant and cheapest renewable resource on the planet. Its biocompatibility and biodegradability make it useful in transforming technological fields including biomedical equipment, electronics and energy. Has huge application potential. Therefore, nano-biomaterials prepared...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00C01B32/15C09K11/65
CPCC01B32/15C01P2002/72C01P2004/04C08H6/00C09K11/65
Inventor 石岩司梦莹刘明人何逾洋杨梓琪颜旭柴立元杨志辉
Owner CENT SOUTH UNIV
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