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Fluorescent carbon nanodots as well as preparation method and application thereof

A carbon nano-dot, fluorescence technology, applied in nano-carbon, nano-technology, nano-technology and other directions, can solve the problems of detection of alizarin red, water pollution, increased water toxicity, etc.

Inactive Publication Date: 2021-05-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At the same time, alizarin red is an organic dye widely used in chemical dyeing and other fields. Since alizarin red belongs to anthraquinone salts, its discharge will pollute water bodies, and the increase of alizarin red concentration will lead to water toxicity. Increase
However, in the prior art, there is no relevant report on how to enable carbon nanodots to detect alizarin red, and have higher selectivity and sensitivity to alizarin red

Method used

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  • Fluorescent carbon nanodots as well as preparation method and application thereof
  • Fluorescent carbon nanodots as well as preparation method and application thereof
  • Fluorescent carbon nanodots as well as preparation method and application thereof

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preparation example Construction

[0033] The invention provides a method for preparing fluorescent carbon nano-dots, comprising the following steps:

[0034] mixing corn stalk powder and water to obtain a corn stalk powder dispersion;

[0035] After the corn stalk powder dispersion is subjected to water liquefaction treatment, it is filtered to obtain a liquefaction liquid;

[0036] After filtering the liquefied liquid with a microporous membrane, dialyzing the obtained filtrate to obtain the fluorescent carbon nano-dots;

[0037] The temperature of the water liquefaction treatment is 230-330° C., and the pressure is 2-12 MPa.

[0038] In the present invention, unless otherwise specified, all preparation materials are commercially available products well known to those skilled in the art.

[0039] The invention mixes the corn stalk powder and water to obtain the corn stalk powder dispersion liquid. In the present invention, there is no special limitation on the particle size of the corn stalk powder, and th...

Embodiment 1

[0060] Mix 50g of corn stalk powder and 500g of water to obtain a corn stalk powder dispersion;

[0061] Put the corn stalk powder dispersion in a reaction kettle for water liquefaction treatment, the temperature of the water liquefaction treatment is 250°C, the time is 30min, the pressure is 3.5MPa, cooled to room temperature, and suction filtered to obtain the liquefaction solution;

[0062] After filtering the liquefied liquid with a microporous filter membrane with a pore size of 0.22 μm, the filtered solution was dialyzed, the molecular weight cut-off of the dialysis was 1000 Da, the dialysis time was 24 hours, and the water was changed every 6 hours. freeze-drying to obtain the fluorescent carbon nano-dots.

Embodiment 2

[0064] Mix 20 g of corn stalk powder with 500 g of water to obtain a corn stalk powder dispersion;

[0065] Put the corn stalk powder dispersion in a reaction kettle for water liquefaction treatment, the temperature of the water liquefaction treatment is 270°C, the time is 10min, the pressure is 4.8MPa, cooled to room temperature, and suction filtered to obtain the liquefaction solution;

[0066] After filtering the liquefied liquid with a microporous filter membrane with a pore size of 0.22 μm, the filtered solution was dialyzed, the molecular weight cut-off of the dialysis was 1000 Da, the dialysis time was 48 hours, and the water was changed every 12 hours. freeze-drying to obtain the fluorescent carbon nano-dots.

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Abstract

The invention relates to the technical field of carbon nanodot materials, in particular to fluorescent carbon nanodots as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps of: mixing corn straw powder with water to obtain a corn straw powder dispersion liquid; carrying out water liquefaction treatment on the corn straw powder dispersion liquid, and filtering to obtain liquefied liquid; and filtering the liquefied liquid by using a microfiltration membrane, and dialyzing to obtain the fluorescent carbon nanodots. According to the invention, the corn straw is used as a carbon source, so that efficient utilization of waste biomass is realized; and meanwhile, the prepared fluorescent carbon nanodots have high selectivity and sensitivity to alizarin red. Meanwhile, the preparation method is simple, convenient, efficient and rapid, no chemical reagent is used in the preparation process, and the development concept of green chemistry is met.

Description

technical field [0001] The invention relates to the technical field of carbon nano-dot materials, in particular to a fluorescent carbon nano-dot and its preparation method and application. Background technique [0002] In recent years, carbon nanodots have attracted much attention as a new fluorescent nanomaterial. Compared with traditional fluorescent materials, carbon nanodots not only have excellent optical properties, but also have good water solubility, low toxicity, good chemical inertness, and biocompatibility. Good performance, simple preparation method and good modification. Based on the above advantages, carbon nanodots have broad application prospects in the fields of bioimaging and sensing. [0003] Biomass, currently the only renewable carbon-containing resource, has been widely used as livestock feed and fuel substitute in the past because of its low nutritional value, tough structure, abundant reserves, cheap and easy availability. In recent years, with the ...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65C01B32/15G01N21/6428G01N21/643G01N2021/6432
Inventor 高岩李志勇崔学军
Owner JILIN UNIV
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