Method for detecting ferric ions by using fluorescent carbon quantum dots

A technology of carbon quantum dots and ferric iron, applied in the field of using fluorescent carbon quantum dots to detect ferric ions, can solve the problems of poor selectivity, complicated preparation and processing processes, and the inability to detect Fe alone, and achieve the effect of convenient operation

Inactive Publication Date: 2016-01-13
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although these methods are sensitive and reliable, there are also some shortcomings: not only expensive large-scale instruments and equipment are required, but also the process of sample preparation and processing is relatively complicated. Fluorescent carbon quantum dots used as carbon needles to detect ferric ion analysis have the advantages of convenient use, high sensitivity, simple equipment required, and good selectivity, and have attracted

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  • Method for detecting ferric ions by using fluorescent carbon quantum dots
  • Method for detecting ferric ions by using fluorescent carbon quantum dots
  • Method for detecting ferric ions by using fluorescent carbon quantum dots

Examples

Experimental program
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Example Embodiment

[0024] Example 1

[0025] (1) Prepare a dispersion with a mass ratio of glucose and absolute ethanol of 5:1;

[0026] (2) Place the above-mentioned mixed solution in a hydrothermal reaction vessel, and place the hydrothermal reaction vessel in an environment at 150° C. for 18 hours to react to obtain fluorescent quantum dots.

[0027] (3) Add 1 ml of the above carbon quantum dot solution to 8 quartz fluorescent cuvettes;

[0028] (4) Use a pipette to adjust the concentration to 0; 2×10 -8 ; 4×10 -8 ; 2×10 -7 ; 8×10 -7 ; 2×10 -6 ; 6×10 -6 ; 4×10 -5 The FeCl3 solution was added to the cuvette containing carbon quantum dots, and put it into the fluorescence spectrophotometer;

[0029] (5) After testing the optimal excitation wavelength of the carbon quantum dots at 360 nm, and adjusting the excitation wavelength of the fluorescence spectrophotometer to the excitation wavelength, recording the curve of the fluorescence intensity of the solution with the fluorescence emission wavelength.

[0...

Example

[0035] Example (2)

[0036] (1) Prepare a dispersion liquid with a mass ratio of glucose and absolute ethanol of 15:1, and place it in a hydrothermal reactor;

[0037] (2) Put the above-mentioned sealed hydrothermal reaction kettle in an environment at 150°C for 18 hours to obtain the carbon quantum dots to be synthesized, such as figure 1 , 2 Shown from figure 1 , figure 2 It can be seen that the size of the prepared carbon quantum dots is below 6nm, from figure 2 It can be seen that 60% of the carbon quantum dots prepared by the present invention are 3-5nm in size;

[0038] (3) Add 1 ml of the above carbon quantum dot solution to 14 quartz fluorescent cuvettes;

[0039] (4) Use a pipette to adjust the concentration to 0; 2×10 -8 ; 4×10 -8 ; 6×10 -8 ; 2×10 -7 ; 4×10 -7 ; 6×10 -7 ; 8×10 -7 ; 2×10 -6 ; 4×10 -6 ; 6×10 -6 ; 2×10 -5 ; 4×10 -5 ; 6×10 -5 The FeCl3 solution was added to the cuvette containing carbon quantum dots, and put it into the fluorescence spectrophotometer;

[0040] (...

Example Embodiment

[0047] Example 3

[0048] (1) Prepare a 25:1 dispersion liquid with a mass ratio of glucose and absolute ethanol, and place it in a hydrothermal reactor for sealing;

[0049] (2) Put the above-mentioned sealed hydrothermal reactor in an environment at 180°C for 18 hours to obtain the carbon quantum dots to be synthesized;

[0050] (3) Add 1 ml of the above carbon quantum dot solution to 14 quartz fluorescent cuvettes;

[0051] (4) Use a pipette to adjust the concentration to 0; 2×10 -8 ; 4×10 -8 ; 6×10 -8 ; 8×10 -8 ; 2×10 -7 ; 4×10 -7 ; 6×10 -7 ; 8×10 -7 ; 2×10 -6 ; 4×10 -6 ; 6×10 -6 ; 2×10 -5 ; 4×10 -5 The FeCl3 solution was added to the cuvette containing carbon quantum dots, and put it into the fluorescence spectrophotometer;

[0052] (5) After testing, the optimal excitation wavelength of the fluorescent carbon quantum dot solution in the present invention is 360 nm, so adjust the excitation wavelength of the fluorescence spectrophotometer to 360 nm, and record the curve of the fluo...

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Abstract

The present invention relates to a method for detecting ferric ions by using fluorescent carbon quantum dots. The method comprises: preparing a dispersion liquid having a mass ratio of glucose and to absolute alcohol of 40:1-5:1; placing into a hydrothermal reaction kettle, and carrying out a reaction for 5-20 h in a 80-230 DEG C environment to obtain fluorescent quantum dots; reactively adding a carbon quantum dot solution to a group of quartz fluorescence cuvettes; adding a ferric ion solution with a concentration of 10<8>-10<5>, placing in a fluorescence spectrophotometer, testing the optimal excitation wavelength of the carbon quantum dots, adjusting the excitation wavelength of the fluorescence spectrophotometer to the optimal excitation wavelength, and recording the change curve of the fluorescence intensity of the solution along with the fluorescence excitation wavelength change; drawing the change curve of the carbon quantum dot solution fluorescence intensity reducing percentage along with the iron ion concentration change, and fitting to obtain a fitting formula; and calculating the ferric ion concentration in the detected object by using the formula. According to the present invention, the method is simple and easy to perform, and other organic reagents are not required to be added.

Description

technical field [0001] The invention belongs to the field of metal ion detection, in particular to a method for detecting ferric ions by using fluorescent carbon quantum dots. Background technique [0002] Compared with traditional semiconductor quantum dots, carbon quantum dots can not only avoid the damage to the environment and life caused by heavy metals, but also have good water solubility, low toxicity, good biocompatibility, strong chemical inertness, light Good stability and other advantages have made carbon quantum dots a substitute for traditional semiconductor quantum dots. [0003] Iron ion is one of the ions necessary for living organisms to carry out life activities. It is the main substance to maintain life, and it is an important metal ion involved in the transportation of oxygen, the formation of muscles, and the formation of life energy conversion enzyme - heme enzyme. Excessive iron ion content in the living body will cause iron ion poisoning, which will ...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 封伟王兆干龙博冯奕钰
Owner TIANJIN UNIV
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