Preparation of acid-resistant carbon quantum dots and its application in the detection of uranium ions

A technology of carbon quantum dots and acid resistance, which is applied in the application field of fluorescent carbon nanomaterials, can solve the problems of rare research in detection, and achieve the effect of good acid resistance and low energy consumption.

Active Publication Date: 2017-06-30
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is little research on the detection of uranium by carbon quantum dots.

Method used

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  • Preparation of acid-resistant carbon quantum dots and its application in the detection of uranium ions
  • Preparation of acid-resistant carbon quantum dots and its application in the detection of uranium ions
  • Preparation of acid-resistant carbon quantum dots and its application in the detection of uranium ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Rinse the 25mL beaker with deionized water and dry it for later use. Weigh 1.051 g of citric acid into a beaker, measure 335 μL of ethylenediamine into the beaker, add 10 mL of deionized water to it, and stir to make it a clear solution. Pour the solution into the reaction vessel, put the reactor on the test bench, adjust the argon gas flow to 60mL / min, and place the two discharge electrodes directly above the reactor, the cathode is a platinum wire electrode, and the anode is an argon gas tube with an inner diameter of 180 μm . The output current of the adjusted constant current power supply is 6mA, and the voltage is about 2400V. After the experiment started, the cathode platinum wire electrode was immersed in the solution, and the anode argon gas tube was slowly lowered until the discharge began. At this time, a stopwatch was used to count the time and keep the discharge stable for 1min. After the discharge, the resulting solution was dialyzed in a dialysis bag (mo...

Embodiment 2

[0028] Keep the discharge stable for 2 minutes, and the others are the same as in Example 1.

Embodiment 3

[0030] Keep the discharge stable for 5 minutes, and the others are the same as in Example 1.

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Abstract

The invention belongs to the technical field of synthesis and application of fluorescent carbon nanomaterials, and particularly relates to preparation and application of an acid resistant carbon quantum dot to uranium ion detection. The method uses citric acid and ethylenediamine as precursors, employs atmospheric micro plasma for assisting the preparation of acid-resistant carbon quantum dots, and has the advantages of fastness, simpleness, low energy consumption, and no subsequent modification. The prepared carbon quantum dot has good acid resistance, and can emit light stably in acid and salt solution; and the fluorescence intensity does not changes due to the presence of other ions in waste water containing uranium, so as to achieve selective detection of uranium. The carbon quantum dot has lower detection concentration on uranium; when the uranium concentration is 0-75 ppm, the fluorescence intensity and the uranium concentration show a good linear relationship; and the detection limit is less than 1ppm.

Description

technical field [0001] The invention belongs to the technical field of application of fluorescent carbon nanometer materials, in particular to the preparation of acid-resistant carbon quantum dots and their application in the detection of uranium ions. Background technique [0002] In the process of uranium mining, extraction, processing and recycling, a large amount of uranium-containing wastewater will be generated, and the concentration of uranium needs to be monitored to ensure the smooth progress of each process. In addition to uranium, the waste water often contains high concentrations of nitric acid or nitrate. Traditional metal ion detection methods such as ICP-MS have high detection sensitivity, but the operation and sampling are cumbersome, and the instruments used are expensive and cumbersome, which cannot realize rapid and real-time monitoring of uranium in wastewater. The fluorescence method has the advantages of high sensitivity, rapid detection, and real-time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C01B32/15G01N21/64B82Y40/00B82Y20/00
Inventor 陆跃翔王哲袁航陈靖
Owner TSINGHUA UNIV
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