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Preparation method of fluorescent carbon quantum dot probe for detecting beryllium in water

A technology for carbon quantum dots and water detection, which is applied in the field of rapid detection of beryllium ions in water, can solve the problems of difficult preparation and storage of hexamethylenetetramine buffer solution, cumbersome sample preparation and processing process, cumbersome and complicated detection, etc. Good performance, low cost, and less reading interference

Inactive Publication Date: 2014-08-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these substances have been widely used in the detection of beryllium, there are still many shortcomings: (1) they are organic dyes or contain heavy metal elements, which will cause certain pollution to the environment; (2) the six times in the national standard method Methyltetramine buffer solution (HMT-HCl) is not easy to prepare and store, making the detection still too cumbersome and complicated (3) The sample preparation and processing process is cumbersome, and a variety of solutions need to be prepared; (4) Low selectivity

Method used

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  • Preparation method of fluorescent carbon quantum dot probe for detecting beryllium in water
  • Preparation method of fluorescent carbon quantum dot probe for detecting beryllium in water
  • Preparation method of fluorescent carbon quantum dot probe for detecting beryllium in water

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Embodiment 1

[0026] A method for preparing a fluorescent carbon quantum dot probe for detecting beryllium in water, comprising the steps of:

[0027] (1) Prepare a citric acid solution with a concentration of 0.04g / ml;

[0028] (2) Weigh urea and add it to the above citric acid solution, stir evenly to obtain a mixed solution, the concentration of the urea is 0.01g / ml;

[0029] (3) Transfer the above mixed solution to a hydrothermal reaction kettle, react at 200°C for 5 hours, and wait for the reaction kettle to cool down to room temperature naturally to obtain a brown aqueous solution;

[0030] (4) First use a high-speed centrifuge to centrifuge the brown aqueous solution at 10,000 rpm for 10 minutes to remove larger particles; then use a 1000Da dialysis bag for dialysis for 24 hours to remove unreacted substances and impurity ions, and then fill the brown aqueous solution Put it into a pear-shaped bottle, use a rotary evaporator to concentrate at a speed of 40 rpm and a heating temperat...

Embodiment 2

[0033] A method for preparing a fluorescent carbon quantum dot probe for detecting beryllium in water, comprising the steps of:

[0034] (1) Prepare a citric acid solution with a concentration of 0.04g / ml;

[0035] (2) Weigh urea and add it to the above citric acid solution, stir evenly to obtain a mixed solution, the concentration of the urea is 0.02g / ml;

[0036] (3) Transfer the above mixed solution to a hydrothermal reaction kettle, react at 200°C for 6 hours, and wait for the reaction kettle to cool down to room temperature naturally to obtain a brown aqueous solution;

[0037] (4) First use a high-speed centrifuge at 10,000 rpm for 10 minutes to remove larger particles; then use a 1000Da dialysis bag for 24 hours to remove unreacted substances and impurity ions, and then put the brown aqueous solution into pears shaped bottle, using a rotary evaporator at a rotation speed of 60 rpm and a heating temperature of 70°C to concentrate for 2 hours, and finally dried in a va...

Embodiment 3

[0040] A method for preparing a fluorescent carbon quantum dot probe for detecting beryllium in water, comprising the steps of:

[0041] (1) Prepare a citric acid solution with a concentration of 0.04g / ml;

[0042] (2) Weigh urea and add it to the above citric acid solution, stir evenly to obtain a mixed solution, the concentration of the urea is 0.03g / ml;

[0043] (3) Transfer the above mixed solution to a hydrothermal reaction kettle, react at 200°C for 5 hours, and wait for the reaction kettle to cool down to room temperature naturally to obtain a brown aqueous solution;

[0044] (4) First use a high-speed centrifuge at 10,000 rpm for 10 minutes to remove larger particles; use a 1000Da dialysis bag for 24 hours to remove unreacted substances and impurity ions, and then put the brown aqueous solution into the pear-shaped The bottle was concentrated with a rotary evaporator at a rotation speed of 50 rpm and a heating temperature of 60°C for 3 hours, and finally dried in a ...

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Abstract

A preparation method of a fluorescent carbon quantum dot probe for detecting beryllium in water comprises the following steps: preparing a citric acid solution with a concentration of 0.04 g / ml; weighing urea, adding the urea into the above citric acid solution, uniformly stirring to obtain a mixed solution, wherein the urea concentration is 0.01-0.04 g / ml; transferring the above mixed solution into a hydro-thermal reaction vessel, reacting at 200-240 DEG C, naturally cooling the reaction vessel to room temperature to obtain a brown aqueous solution; performing centrifugation by a centrifuge and dialysis in order of the brown aqueous solution, then concentrating the brown aqueous solution by a rotary evaporator, and finally drying in a vacuum drying oven to obtain a solid viscous substance. The product of the invention makes use of the fluorescence characteristic of carbon quantum dots; detection of beryllium ion content is carried out by a fluorescence spectrophotometer, which is low in cost; the sample preparation and treatment steps are simple and easy to operate; the detection selectivity and sensitivity are high; the product of the invention is widely applicable to beryllium ion detection.

Description

technical field [0001] The invention relates to the field of rapid detection of beryllium ions in water, in particular to a preparation method of a fluorescent carbon quantum dot probe for detecting beryllium in water. Background technique [0002] Beryllium is a light metal with a gray appearance, which is very important in the defense and electronics industries. However, beryllium and its compounds are highly toxic, and metal beryllium, beryllium oxide or beryllium salts may cause diseases such as cancer after entering the human body. Studies have shown that soluble beryllium compounds are mainly stored in bones, liver, kidneys, and lymph nodes. They can interact with plasma proteins to form protein complexes, causing organ or tissue lesions and causing cancer. Therefore, the determination of beryllium content is of great significance, especially the water-soluble beryllium ions and their compounds in water. [0003] At present, the detection of beryllium is usually real...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C09K11/65G01N21/64C01B32/15
Inventor 曾海波李晓明刘妍利
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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