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Hydrothermal method for synthesizing biomass fluorescence carbon dots by taking soybean meals as raw materials and application

A raw material water and thermal synthesis technology, applied in the direction of fluorescence/phosphorescence, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of no corresponding, and achieve low cost, simple operation, and easy promotion Effect

Active Publication Date: 2019-08-23
HANGZHOU LVSAIKELIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on using waste biomass soybean residue as raw material for hydrothermal treatment
In addition, the carbon dots currently synthesized from biomass have a negative effect on Fe 3+ Heavy metal ions have no corresponding

Method used

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  • Hydrothermal method for synthesizing biomass fluorescence carbon dots by taking soybean meals as raw materials and application
  • Hydrothermal method for synthesizing biomass fluorescence carbon dots by taking soybean meals as raw materials and application
  • Hydrothermal method for synthesizing biomass fluorescence carbon dots by taking soybean meals as raw materials and application

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Uniformly mix the remaining fresh okara and ultrapure water at a ratio of 1:4 (weight ratio) to make a precursor solution for future use;

[0037] (2) Heat the obtained precursor solution (60mL) in a 100mL stainless steel autoclave at 200°C with magnetic stirring at 200rpm for 3h;

[0038] (3) Naturally cool to room temperature, filter or centrifuge to remove insoluble matter, the supernatant is dialyzed through a 1000Da dialysis bag, and freeze-dried at -50°C to obtain carbon quantum dot powder (50 mg), with a quantum yield of 3.7%.

[0039]figure 1 It is the ultraviolet-visible absorption spectrum, (fluorescence) excitation spectrum and emission spectrum figure of the solution of the carbon quantum dot prepared under this experimental condition; From figure 1 It can be seen that the carbon quantum dot has significant absorption in the ultraviolet range of 210-400nm, the maximum excitation wavelength is 346nm, and the maximum emission wavelength is 440nm.

[0040]...

Embodiment 2

[0048] (1) Uniformly mix the remaining fresh okara and ultrapure water at a ratio of 1:2 to make a precursor solution for subsequent use;

[0049] (2) Heat the obtained precursor solution (60mL) in a 100mL stainless steel autoclave at 300°C with magnetic stirring at 200rpm for 3h;

[0050] (3) Naturally cool to room temperature, filter or centrifuge to remove insoluble matter, the supernatant is dialyzed through a 1000Da dialysis bag, and freeze-dried at -50°C to obtain carbon quantum dot powder (110mg), with a quantum yield of 4.7%.

Embodiment 3

[0052] (1) Uniformly mix the remaining fresh okara and ultrapure water at a ratio of 1:4 to make a precursor solution for future use;

[0053] (2) Heat the obtained precursor solution (60mL) in a 200mL polytetrafluoroethylene autoclave at 250°C for 5h;

[0054] (3) Naturally cool to room temperature, filter or centrifuge to remove insoluble matter, the supernatant is dialyzed through a 1000Da dialysis bag, and freeze-dried at -50°C to obtain 50 mg of carbon quantum dot powder with a quantum yield of 4.2%.

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Abstract

The invention discloses a hydrothermal method for synthesizing carbon quantum dots by taking soybean meals as raw materials. The method comprises the following steps: mixing the soybean meals and water to obtain a precursor solution containing soybean meals, adding the precursor solution into an autoclave, heating and reacting at a temperature of 100-500 DEG C, cooling and removing insoluble substances after the reaction is completed, dialyzing and free-drying the supernatant, thereby obtaining the carbon quantum dot powder. The invention further discloses carbon quantum dots prepared by the method and application of the carbon quantum dots. The photoluminescence carbon quantum dots prepared by the method disclosed by the invention are capable of detecting Hg<2+> and Fe<3+> in water, the minimum detection limit can reach 30nmol / L, and the detected linear range is 0.1-50mu mol / L. The raw materials involved in the method disclosed by the invention are wide in source, the product is prepared by a hydrothermal synthesis method, and the method is simple in operation, low in cost, high in yield, simple in preparation technology equipment and easy to popularize. Moreover, the prepared carbon quantum dots can be applied to detecting Hg<2+> and Fe<3+> heavy metal ions in surface water.

Description

technical field [0001] The invention relates to a method for hydrothermally synthesizing carbon quantum dots using bean dregs as a raw material and its application, and belongs to the technical field of resource utilization of waste biomass and environmental monitoring. Background technique [0002] As a novel carbon nanomaterial, carbon quantum dots have the advantages of good water solubility, high luminous intensity, low biotoxicity, good biocompatibility, high chemical stability, and easy surface modification, so it is expected to replace traditional semiconductors. Quantum dots and toxic organic dyes. The green synthesis of carbon quantum dots from biological raw materials is in line with the requirements of chemical development and the concept of atom economy, and is a current research hotspot. [0003] The synthesis methods of carbon dots mainly include electrochemical preparation method, strong acid oxidation method, arc discharge method, laser ablation method, chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y30/00G01N21/64
CPCC01B32/15C09K11/65B82Y30/00G01N21/6428G01N2021/6432G01N33/1886G01N2021/7786B82Y40/00B82Y20/00B82Y15/00
Inventor 张立挺张昌爱刘万鹏庄海峰单胜道罗勇鹏胡智超
Owner HANGZHOU LVSAIKELIN TECH CO LTD
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