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Method for preparing fluorescent carbon nanodots through one-step hydrothermal carbonization by taking kelp as carbon source

A technology of carbon nano-dots and hydrothermal carbonization, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., to achieve the effect of simple preparation method, strong practicability, and easy promotion

Active Publication Date: 2016-10-26
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Up to now, there are no domestic and foreign related literature and patent reports on the preparation of fluorescent carbon nanodots by one-step hydrothermal carbonization using macroalgae in the ocean as a single carbon source

Method used

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  • Method for preparing fluorescent carbon nanodots through one-step hydrothermal carbonization by taking kelp as carbon source
  • Method for preparing fluorescent carbon nanodots through one-step hydrothermal carbonization by taking kelp as carbon source
  • Method for preparing fluorescent carbon nanodots through one-step hydrothermal carbonization by taking kelp as carbon source

Examples

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Effect test

Embodiment 1

[0046]Use giant algae as carbon source to prepare fluorescent carbon nanodots by one-step hydrothermal carbonization. The detailed preparation steps of this method are as follows: 1) Wash 500g of fresh macroalgae purchased with water, cut into several pieces and put them in a tray, and put them in an oven Dry at 50°C, and after drying, crush it into powder with a pulverizer. The powder passes through a sieve with a hole size of 80 mesh to obtain a fine and uniform dried macroalgae powder; 2) Weigh 1g of macroalgae dry powder into a beaker, add 2mL Ethanol, stir evenly with a glass rod to obtain a paste; 3) Transfer the paste into a high-pressure reactor, react at 160°C for 6 hours, and obtain a dark brown product, add the product to ethanol, stir well, and then carry out suction filtration Twice, the filtrate was subjected to rotary evaporation at 60° C. to remove the solvent, centrifuged at 10,000 rpm for 15 minutes to obtain a precipitate, and the precipitate was freeze-dried...

Embodiment 2

[0049] The detailed preparation steps are as follows: 1) Wash 500g of fresh macroalgae purchased with water, cut them into several pieces and place them on a tray, put them in an oven and dry them at 60°C, and after drying, use a pulverizer to crush them into powder. Pass through a sieve with a hole size of 100 mesh to obtain fine and uniform macroalgae dry powder; 2) Weigh 2 g of macroalgae dry powder into a beaker, add 5 mL of absolute ethanol, stir with a glass rod to obtain a paste; 3) mix the paste Transfer to a high-pressure reactor and react at 180°C for 4 hours to obtain a dark brown product. Add the product to ethanol, stir evenly, and perform suction filtration twice. Rotate the filtrate at 70°C to remove the solvent, and centrifuge at 12,000rpm A precipitate was obtained after separation for 10 minutes, and the precipitate was subjected to freeze-drying treatment to obtain a dry powder of carbon nanodots. The configuration of the carbon nanodot aqueous dispersion an...

Embodiment 3

[0051] The detailed preparation steps are as follows: 1) Wash 500g of fresh macroalgae purchased with water, cut them into several pieces and place them on a tray, put them in an oven and dry them at 70°C, and after drying, grind them into powder with a pulverizer. Pass through a sieve with a hole size of 150 mesh to obtain fine and uniform macroalgae dry powder; 2) Weigh 4g of macroalgae dry powder into a beaker, add 10mL of absolute ethanol, stir with a glass rod to obtain a paste; 3) mix the paste Transfer to a high-pressure reactor and react at 190°C for 3 hours to obtain a dark brown product. Add the product to ethanol, stir evenly, and perform suction filtration twice. Rotate the filtrate at 80°C to remove the solvent, and centrifuge at 14,000rpm A precipitate was obtained after separation for 10 minutes, and the precipitate was subjected to freeze-drying treatment to obtain a dry powder of carbon nanodots. The configuration of the carbon nanodot aqueous dispersion and i...

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Abstract

The invention provides a method for preparing fluorescent carbon nanodots through one-step hydrothermal carbonization by taking kelp as a carbon source. The method comprises the following steps: 1) cleaning, slicing, baking and grinding fresh kelp, and sieving to obtain powder; 2) weighing and dispersing a certain amount of kelp powder in ethanol, stirring to obtain paste, putting the paste in an autoclave, and reacting for a period of time at high temperature; and 3) dispersing the product in ethanol, carrying out suction filtration, solvent rotary evaporation, and centrifugal separation to obtain precipitates, and freeze-drying the precipitates to obtain the carbon nanodots. The method provided by the invention is simple in operation, the cost is low, and the raw materials are easy to obtain; and the prepared carbon nanodots have excellent fluorescent properties and good biocompatibility and are expected to be widely applied to important fields, such as chemical sensing, biological analysis, environmental monitoring, photocatalysis, biological imaging and photoelectric conversion.

Description

technical field [0001] The invention belongs to the technical field of preparation of fluorescent quantum dots and nanometer materials, in particular to a method for preparing fluorescent carbon nanometer dots by one-step hydrothermal carbonization using giant algae as a carbon source. Background technique [0002] Due to their excellent optical and electrical properties, fluorescent nanoparticles have broad application prospects in the fields of light-emitting devices and biomedicine. As a new type of carbon nanomaterial, carbon nanodots (commonly referred to as carbon quantum dots) are generally less than 10nm in size and are a type of spherical fluorescent nanoparticles with good dispersion ability. Carbon nanodots have received extensive attention since their discovery. Compared with traditional semiconductor quantum dots (such as CdTe, CdSe, etc.), it not only has a higher fluorescence quantum yield, but also has low or no toxicity, good biocompatibility and water solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B31/02B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 王宗花王本乾桂日军金辉高翠丽
Owner QINGDAO UNIV
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