Synthetic method of chitosan biomass-derived high-yield nitrogen-doped fluorescent carbon nanodots

A technology of carbon nano-dots and synthesis methods, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of low synthesis yield, achieve high synthesis yield, reduce production cost, Effect without post-passivation treatment

Active Publication Date: 2016-08-31
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a high-yield nitrogen-doped fluorescent carbon nano-dot synthesis method derived from chitosan biomass in order to solve the problem of low synthesis yield of fluorescent carbon nano-dots derived from biomass in the prior art

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  • Synthetic method of chitosan biomass-derived high-yield nitrogen-doped fluorescent carbon nanodots
  • Synthetic method of chitosan biomass-derived high-yield nitrogen-doped fluorescent carbon nanodots
  • Synthetic method of chitosan biomass-derived high-yield nitrogen-doped fluorescent carbon nanodots

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Embodiment 1

[0021] Embodiment 1: A kind of synthetic method of the high-yield nitrogen-doped fluorescent carbon nano-dot originating from chitosan biomass in the present embodiment is completed by following steps:

[0022] Dissolve 0.1g chitosan derivatives containing unsaturated double bonds in 20mL of ultrapure water, configure an aqueous solution with a concentration of 1mg / mL, place it in a reaction kettle, and then heat it at 180°C The carbonization reaction was taken out after 12 hours. Centrifuge the reaction solution at a speed of 15000r / min for 10min to remove the black precipitate particles in the reaction solution, and finally use a dialysis membrane with a molecular weight cut-off of 1kD to dialyze in deionized water for 48h to obtain a nitrogen-doped fluorescent carbon nanodot solution. Freeze-dry to obtain a nitrogen-doped fluorescent carbon nano-dot solid sample with a yield of 46%. The structure of the described unsaturated double-bond chitosan derivative is as follows: ...

Embodiment 2

[0026] Embodiment 2: A kind of synthetic method of the high-yield nitrogen-doped fluorescent carbon nano-dot originating from chitosan biomass in the present embodiment is completed by the following steps:

[0027] Dissolve 0.5g chitosan derivatives containing unsaturated double bonds in 20mL of ultrapure water to form an aqueous solution with a concentration of 5mg / mL. The carbonization reaction was taken out after 12 hours. Centrifuge the reaction solution at a speed of 15000r / min for 10min to remove the black precipitate particles in the reaction solution, and finally use a dialysis membrane with a molecular weight cut-off of 1kD to dialyze in deionized water for 48h to obtain a nitrogen-doped fluorescent carbon nanodot solution. Freeze-dry to obtain a nitrogen-doped fluorescent carbon nano-dot solid sample with a yield of 42%. The structure of the chitosan derivative containing unsaturated double bonds in this embodiment is the same as that of Embodiment 1.

Embodiment 3

[0028] Embodiment 3: A kind of synthetic method of the high-yield nitrogen-doped fluorescent carbon nano-dot originating from chitosan biomass in the present embodiment is completed by the following steps:

[0029] Dissolve 1g of chitosan derivatives containing unsaturated double bonds in 20mL of ultrapure water to form an aqueous solution with a concentration of 10mg / mL, place it in a reaction kettle, and then conduct hydrothermal carbonization at a temperature of 220°C Take it out after 24 hours of reaction. Centrifuge the reaction solution at a speed of 15000r / min for 10min to remove the black precipitate particles in the reaction solution, and finally use a dialysis membrane with a molecular weight cut-off of 1kD to dialyze in deionized water for 48h to obtain a nitrogen-doped fluorescent carbon nanodot solution. Freeze-dry to obtain a nitrogen-doped fluorescent carbon nano-dot solid sample with a yield of 40%. The structure of the chitosan derivative containing unsaturat...

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Abstract

The invention discloses a synthetic method of chitosan biomass-derived high-yield nitrogen-doped fluorescent carbon nanodots and belongs to the field of biomass carbon material synthetic technology. The invention aims to solve the problem of low synthetic yield of biomass-derived fluorescent carbon nanodots existing in the prior art. The synthetic method of the invention comprises the following steps: dissolving a chitosan derivative containing unsaturated double bond in ultrapure water, carrying out hydrothermal carbonization and successively carrying out centrifugal separation, dialysis and freeze-drying treatment so as to obtain solid nitrogen-doped fluorescent carbon nanodots. The dimension of the prepared nitrogen-doped carbon nanodots is 3-5nm. The surface of the carbon nanodots contains amino group, carboxyl group and hydroxyl group. Quantum efficiency is 20-30%. The chitosan containing unsaturated double bond is used as a carbon source, and high-yield (46%) synthesis of the chitosan biomass-derived nitrogen-doped fluorescent carbon nanodots is realized. The method of the invention is expected to realize preparation of the carbon nanodots in macroscopic quantity.

Description

technical field [0001] The invention belongs to the technical field of biomass carbon material synthesis, and in particular relates to a method for synthesizing high-yield nitrogen-doped fluorescent carbon nano-dots with chitosan as a raw material. Background technique [0002] Carbon nanodots are quasi-zero-dimensional carbon nanomaterials, which are widely used in bioimaging, biosensors, and light-emitting devices due to their excellent photoluminescence properties. Compared with semiconductor quantum dots or noble metal nanoclusters, it has a rich variety of carbon sources, better biocompatibility and greatly reduces the potential harm to the environment. Since the first successful synthesis of fluorescent carbon nano-dot materials at La Carolina State University in 2004, it has become a research hotspot of nano-fluorescent materials. The carbon sources currently used to synthesize carbon nanodots include carbon nanotubes, carbon fibers, carbon soot, activated carbon, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C09K11/65B82Y30/00
CPCC01P2002/84C01P2004/04C01P2004/64C09K11/65
Inventor 李保强王磊徐哲恒史鑫尧贾德昌周玉
Owner HARBIN INST OF TECH
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