Unlock instant, AI-driven research and patent intelligence for your innovation.

Synthesis method of in situ doping fluorescent carbon dots with metal elements derived from chitosan biomass

A technology of metal elements and synthesis methods, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of uncontrollable fluorescence intensity of fluorescent carbon dots, low content of doped metal elements, complex pyrolysis equipment, etc., and achieve excellent luminescence performance , increase the fluorescence intensity, and adjust the effect of fluorescence intensity

Active Publication Date: 2018-01-09
HARBIN INST OF TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the pyrolysis equipment existing in the existing method for preparing fluorescent carbon dots is complex, the synthesis steps are cumbersome, the fluorescence intensity of fluorescent carbon dots cannot be adjusted and the content of doped metal elements is low, and a new method is provided. Synthesis method of in situ doping fluorescent carbon dots with metal elements derived from chitosan biomass

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Synthesis method of in situ doping fluorescent carbon dots with metal elements derived from chitosan biomass
  • Synthesis method of in situ doping fluorescent carbon dots with metal elements derived from chitosan biomass
  • Synthesis method of in situ doping fluorescent carbon dots with metal elements derived from chitosan biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: in the present embodiment, a kind of synthetic method that originates from chitosan biomass metal element in situ doping fluorescent carbon dot is to finish by following steps:

[0035] Step 1, the Zn(OH) of 5g 2- Chitosan composite hydrogel was placed in a hydrothermal reaction kettle with a polytetrafluoroethylene liner, and then 1 g of crotonic acid and 20 mL of deionized water were added, and hydrothermal carbonization was carried out at 220 ° C for 12 hours;

[0036] Step 2: Centrifuge at 12,000r / min for 10min to remove sediment particles, and finally dialyze in deionization for 48h with a dialysis bag with a molecular weight cut-off of 1kD to obtain a fluorescent carbon dot solution doped with zinc in situ.

[0037] where Zn(OH) 2 -The synthetic method of chitosan composite hydrogel is: add 0.167g ZnCl to the acetic acid solution of the chitosan of 4wt% to 10mL weight percentage concentration 2 , then add 500mL of 5wt% sodium hydroxide solution, cr...

Embodiment 2

[0038] Embodiment 2: a kind of synthetic method that originates from chitosan biomass metal element in situ doping fluorescent carbon point in the present embodiment is accomplished through the following steps:

[0039] Step 1, 5g of Co(OH) 2 - Chitosan composite hydrogel was placed in a hydrothermal reaction kettle with a polytetrafluoroethylene liner, and then 1 g of crotonic acid and 20 mL of deionized water were added, and hydrothermal carbonization was carried out at 220 ° C for 12 hours;

[0040] Step 2: centrifuge at 12000r / min for 10min to remove sediment particles, and finally use a dialysis bag with a molecular weight cut-off of 1kD to dialyze in deionization for 48h to obtain cobalt doped fluorescent carbon dot solution in situ.

[0041] where Co(OH) 2 -The synthetic method of chitosan composite hydrogel is: add 0.319g CoCl to the acetic acid solution of chitosan that 10mL weight percent concentration is 4wt% 2 ·6H 2 O, then add 500mL of 5wt% sodium hydroxide sol...

Embodiment 3

[0042] Embodiment 3: a kind of synthetic method that originates from chitosan biomass metal element in situ doping fluorescent carbon point in the present embodiment is accomplished through the following steps:

[0043] Step 1, the Ni(OH) of 5g 2 - Chitosan composite hydrogel was placed in a hydrothermal reaction kettle with a polytetrafluoroethylene liner, and then 1 g of crotonic acid and 20 mL of deionized water were added, and hydrothermal carbonization was carried out at 220 ° C for 12 hours;

[0044] Step 2: centrifuge at 12000r / min for 10min to remove sediment particles, and finally use a dialysis bag with a molecular weight cut-off of 1kD to dialyze in deionization for 48h to obtain cobalt doped fluorescent carbon dot solution in situ.

[0045] where Ni(OH) 2 -The synthetic method of chitosan composite hydrogel is: add 0.354g NiSO in the acetic acid solution of the chitosan of 4wt% to 10mL weight percentage concentration 4 ·6H 2 O, then add 500mL of 5wt% sodium hydr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for synthesizing metallic element in-situ doped fluorescence carbon dots deriving from chitosan biomass and belongs to the technical field of biomass carbon synthesis.The method aims to solve the problems of existing fluorescence carbon dot preparing methods that pyrolysis equipment is complicated, and the content of doped metal elements is low.The method comprises the steps of placing metal hydroxide-chitosan composite hydrogel in a hydrothermal reaction kettle with a polytetrafluoroethylene lining, adding carboxylic acid or amide containing an unsaturated double bond and deionized water, and then conducting hydrothermal carbonization treatment; conducting centrifugal treatment to remove precipitate particles, and then conducting dialysis with deionized water.The method can be widely applied to fields including bioimaging, lithium ion batteries and supercapacitors.

Description

technical field [0001] The invention belongs to the technical field of biomass carbon synthesis, and in particular relates to a method for synthesizing metal element in-situ doped fluorescent carbon dots by using metal hydroxide-chitosan composite hydrogel as a precursor. Background technique [0002] Fluorescent carbon dots are zero-dimensional carbon nanomaterials mainly composed of carbon elements, which have good fluorescence properties, low toxicity, high biocompatibility and chemical inertness. Since fluorescent carbon dots are usually composed of non-metallic elements such as C, H, O, and N, and there are many defects in the structure, the ability to transfer electrons is weak, which limits its application in photocatalysis, electrochemical catalysis and applications in electrochemical energy storage. [0003] By doping metal elements or metal oxides into fluorescent carbon dots, the performance of fluorescent carbon dots can be improved in the following aspects: (1)...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65
CPCC09K11/65
Inventor 李保强董龙沛程银锋黄春发贾德昌周玉
Owner HARBIN INST OF TECH