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Biomass-based carbon quantum dot and preparation method thereof

A technology based on carbon quantum and biomass, which is applied in the field of biomass-based carbon quantum dots and their preparation, can solve the problems of high cost, complex process, unenvironmental protection, etc., and achieve the effects of short reaction time, simple preparation process and small size

Active Publication Date: 2017-12-01
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems existing in the prior art, an object of the present invention is to provide a preparation method of biomass-based carbon quantum dots, so as to solve the problems of complex process, high cost and non-environmental protection in the prior art

Method used

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  • Biomass-based carbon quantum dot and preparation method thereof
  • Biomass-based carbon quantum dot and preparation method thereof
  • Biomass-based carbon quantum dot and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Peanut shells are cleaned, crushed, sieved, and dried at 85°C. The mass ratio is peanut shells: K 2 CO 3 =5:3 add appropriate amount of water to mix, and dry at 105°C to obtain an impregnated sample. The impregnated sample was placed in a reaction furnace and carbonized at 300°C for 2 hours to obtain a carbonized sample. Soak the carbonized sample with an appropriate amount of water, stir and filter, add acid to the filtrate to adjust pH=1, filter, and dialyze the filtrate for 24 hours with a 1000Da dialysis bag to obtain a light yellow aqueous solution of carbon quantum dots. The aqueous solution of carbon quantum dots is left standing for more than 8 weeks, no insoluble matter is precipitated, and the fluorescence intensity remains basically unchanged.

[0030] figure 1 Its transmission electron microscope (TEM) picture, from figure 1 It can be seen from the figure that the particle size of the carbon quantum dots prepared in this embodiment is relatively uniform,...

Embodiment 2

[0033] Peanut shells are cleaned, crushed, sieved, and dried at 85°C. The mass ratio is peanut shells: K 2 CO 3 =5:1 add appropriate amount of water to mix, and dry at 105°C to obtain an impregnated sample. The impregnated sample was placed in a reaction furnace and carbonized at 250°C for 3 hours to obtain a carbonized sample. Soak the carbonized sample with an appropriate amount of water, stir and filter, add acid to the filtrate to adjust pH=1, filter, and dialyze the filtrate for 24 hours with a 1000Da dialysis bag to obtain a light yellow aqueous solution of carbon quantum dots. The aqueous solution of carbon quantum dots is left standing for more than 8 weeks, no insoluble matter is precipitated, and the fluorescence intensity remains basically unchanged.

[0034] After the above carbon quantum dot aqueous solution is freeze-dried, biomass-based carbon quantum dots are obtained.

Embodiment 3

[0036] Peanut shells are cleaned, crushed, sieved, and dried at 105°C. The mass ratio is peanut shells: K 2 CO 3 =5:10 add appropriate amount of water to mix, and dry at 105°C to obtain an impregnated sample. The impregnated sample was placed in a reaction furnace and carbonized at 350°C for 1 hour to obtain a carbonized sample. Soak the carbonized sample with an appropriate amount of water, stir and filter, add acid to the filtrate to adjust pH=1, filter, and dialyze the filtrate for 24 hours with a 1000Da dialysis bag to obtain a light yellow aqueous solution of carbon quantum dots. The aqueous solution of carbon quantum dots is left standing for more than 8 weeks, no insoluble matter is precipitated, and the fluorescence intensity remains basically unchanged.

[0037] After the above carbon quantum dot aqueous solution is freeze-dried, biomass-based carbon quantum dots are obtained.

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Abstract

The invention discloses a biomass-based carbon quantum dot and a preparation method thereof, belonging to the technical field of preparation of carbon quantum dot preparation. The preparation method comprises the steps of adding water to a husk material and an activator, mixing and drying to prepare a dipping sample; carbonizing the dipping sample to prepare a carbonized sample; adding water to soak the carbonized sample, filtering, adjusting the pH value of filtrate to be smaller than or equal to 3; and filtering and then dialyzing filtrate and carrying out freeze drying to prepare the biomass-based carbon quantum dot, wherein the activator is one or more of KOH, NaOH, K2CO3, KHCO3, Na2CO3 and NaHCO3. According to the biomass-based carbon quantum dot, the preparation process is simple, raw materials are environmentally friendly, cheap, and easily available, the prepared carbon quantum dot is small in size and uniform in particle size distribution.

Description

technical field [0001] The invention belongs to the technical field of carbon quantum dot preparation, and in particular relates to a biomass-based carbon quantum dot and a preparation method thereof. Background technique [0002] Due to the inherent toxicity and environmental hazards of traditional semiconductor quantum dots, their practical applications are limited. In comparison, the emerging fluorescent carbon quantum dots not only inherit the excellent optical properties of traditional semiconductor quantum dots, but also have excellent biocompatibility, low toxicity and chemical inertness, making them suitable for in vivo and in vitro biological imaging, fluorescent labeling, Drug delivery, environmental metal ion fluorescent probes, organic pollutant degradation and photocatalysts for water splitting to produce hydrogen, as well as biosensors and photoelectric devices have important application potential. [0003] The reported methods for preparing carbon quantum dot...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B32/15B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01P2004/04C01P2004/64C01P2006/60C09K11/65
Inventor 张胜利陈豪宇凯橙橙苏凯周祚万王群
Owner SOUTHWEST JIAOTONG UNIV
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