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Preparation method and application of cellulose-based nitrogen-doped fluorescent carbon quantum dots

A carbon quantum dot, cellulose-based technology, which is applied in the field of preparing nitrogen-doped fluorescent carbon quantum dots based on cellulose, can solve the problems of complex synthesis steps, non-renewable raw materials, expensive instruments and equipment, etc., so as to solve the problems of expensive raw materials and good biological Compatible, low-cost effects

Inactive Publication Date: 2018-09-04
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: existing methods for preparing carbon quantum dots have problems such as expensive equipment, complex synthesis steps, and non-renewable raw materials, and a cellulose-based nitrogen-doped fluorescent carbon quantum dot is provided. Preparation

Method used

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  • Preparation method and application of cellulose-based nitrogen-doped fluorescent carbon quantum dots
  • Preparation method and application of cellulose-based nitrogen-doped fluorescent carbon quantum dots
  • Preparation method and application of cellulose-based nitrogen-doped fluorescent carbon quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Weigh 10g of softwood dissolving pulp cellulose (polymerization degree 884, purchased from Shandong Bohai Industrial Co., Ltd.) and add to 140mL HNO 3 and H 3 PO 4 In the mixed solution (2:1, V / V), swell at room temperature for 30 minutes, and add 1.96g NaNO under the condition of mechanical stirring at 10000r / min 2, adjust the reaction temperature of the system to 65 °C and heat the reaction for 24 hours to obtain the crude oxidized cellulose product; after cooling to room temperature, place the above crude product in 140 mL of ultra-pure water for precipitation, and after standing for 30 min, at a speed of 12000 r / min Centrifuge for 30 minutes, wash repeatedly with 95% ethanol / water solution (2:1, V / V) until the pH of the filtrate is neutral, and dry the precipitate under vacuum at 50°C for 48 hours to obtain purified oxidized cellulose; The oxidized cellulose was dissolved in ultrapure water, and ultrasonic dispersion was performed for 1 hour under the condition th...

Embodiment 2

[0039] Weigh 10g of softwood dissolving pulp cellulose (polymerization degree 884, purchased from Shandong Bohai Industrial Co., Ltd.) and add to 140mL HNO 3 and H 3 PO 4 In the mixed solution (2:1, V / V), swell at room temperature for 30 minutes, and add 1.96g NaNO under the condition of mechanical stirring at 10000r / min 2 , adjust the reaction temperature of the system to 65 °C and heat the reaction for 24 hours to obtain the crude oxidized cellulose product; after cooling to room temperature, place the above crude product in 140 mL of ultra-pure water for precipitation, and after standing for 30 min, at a speed of 12000 r / min Centrifuge for 30 minutes, wash repeatedly with ethanol / water solution (2:1, V / V) until the pH of the filtrate is neutral, and dry the precipitate under vacuum at 50°C for 48 hours to obtain purified oxidized cellulose; then the purified oxidized cellulose The cellulose was dissolved in ultrapure water, and ultrasonically dispersed for 1 hour under th...

Embodiment 3

[0042] The difference from Example 2 is that the oxidized cellulose nanoparticles and NH in ammonia 3 The mass ratio is 1:2.5.

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Abstract

The invention discloses a preparation method of cellulose-based nitrogen-doped fluorescent carbon quantum dots, and belongs to the field of fluorescent nano material science. The method comprises thefollowing steps of: (1) placing cellulose in a HNO3 / H3PO4 / NaNO2 oxidation system, performing selective oxidation on C-6 hydroxyl groups, adding ultrapure water, performing static settlement, performing centrifugation, washing, drying and ultrasonic treatment to obtain an aqueous solution of oxidized cellulose nanoparticles; and (2) mixing the aqueous solution of the oxidized cellulose nanoparticles with ammonia water, pouring the mixture into a reaction kettle, performing a hydrothermal reaction, cooling to room temperature, performing ultrasonication and centrifugation so as to remove insoluble precipitate thoroughly and obtain supernatant, and finally conducting rotary evaporation on the supernatant to obtain the cellulose-based nitrogen-doped carbon quantum dots. The raw materials haverich sources and low price, and the preparation process is green and simple, and needs no expensive equipment; the prepared cellulose-based nitrogen-doped carbon quantum dots have high fluorescence intensity, low toxicity and good water solubility, and can be applied to detection of Fe<3+>.

Description

technical field [0001] The invention belongs to the field of preparation of fluorescent carbon quantum dots, in particular to a method for preparing nitrogen-doped fluorescent carbon quantum dots based on cellulose. The prepared carbon quantum dots have high fluorescence intensity, non-toxicity and low cost, and are suitable for metal ion sensing field, easy to realize industrial production. Background technique [0002] Carbon quantum dots are a new type of fluorescent "zero-dimensional" carbon nanomaterials that have attracted much attention in recent years. They have excellent fluorescence properties, good water solubility and environmental friendliness. and other fields have shown great application prospects. The preparation methods of carbon quantum dots usually include electrochemical synthesis, chemical oxidation, combustion, hydrothermal synthesis, template method, microwave synthesis, etc. Among them, due to the simple synthesis steps of the hydrothermal synthesis ...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/65G01N21/6428G01N2021/6432
Inventor 郭延柱刘真真李海明王兴周景辉
Owner DALIAN POLYTECHNIC UNIVERSITY
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