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Chemiluminiscence enhancer, preparation method thereof and application thereof in detection of nitrite

A chemiluminescence and nitrite technology, which is applied in the field of chemiluminescence enhancers and its preparation, can solve problems such as large detection errors, complicated procedures, and expensive instruments required for detection, and achieve the best detection effect

Active Publication Date: 2020-06-26
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional detection error is large and the procedure is relatively complicated
Although the electrochemical method has fast response and simple operation, the equipment required for detection is relatively expensive, which limits its wide application

Method used

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  • Chemiluminiscence enhancer, preparation method thereof and application thereof in detection of nitrite
  • Chemiluminiscence enhancer, preparation method thereof and application thereof in detection of nitrite
  • Chemiluminiscence enhancer, preparation method thereof and application thereof in detection of nitrite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The inventors of the present application have discovered through a large number of experiments that rare earth element-doped fluoride nanoparticles are prone to produce active oxygen species, which can enhance NaNO 2 -H 2 O 2 The chemiluminescence of the system and the degree of enhancement are similar to that of NO 2 - The concentration is linearly related. In addition, the inventor of the present application has discovered through a large number of experiments that the fluoride doped with rare earth elements has good thermal stability, high ionicity, low refractive index, wide band gap and low phonon energy. Therefore, doped rare earth elements The fluoride is suitable as a chemiluminescent material and can be used for NO 2 - Detection.

[0052] Based on the above findings, the embodiments of the present application provide a nanomaterial including fluoride and doped rare earth elements. The fluoride may be a rare earth fluoride, and the rare earth element may be cerium. ...

Embodiment 2

[0055] The embodiments of the present application provide a preparation method of the nanomaterial in Example 1, specifically, the preparation of rare earth element-doped fluoride nanoparticles by a hydrothermal method. Specifically include the following steps.

[0056] 2.1. Prepare rare earth salt aqueous solution and NaF aqueous solution separately.

[0057] 2.2. Mix the rare earth salt aqueous solution, NaF aqueous solution, absolute ethanol and oleic acid in the reaction kettle, stir for 30 minutes, and heat at 200°C for 8 hours.

[0058] 2.3. After the reaction is over, suck out the supernatant in the reaction kettle, centrifuge the remaining suspension at 6000 rpm for 5 min, remove the supernatant, add hydrochloric acid to the remaining solid, and ultrasonically disperse.

[0059] 2.4. Add absolute ethanol, centrifuge at 6000 rpm for 5 minutes, remove the supernatant, and dissolve the remaining solids in water for later use.

[0060] Next, specific examples are used to illustrate...

Embodiment 3

[0062] In this embodiment, Ce(III) in the positive trivalent state is doped into LaF 3 Nanoparticles, synthetic chemiluminescence enhancers (Ce NPs). details as follows.

[0063] Prepare 0.2mol·L separately -1 LaCl 3 Aqueous solution, 0.05mol·L -1 CeCl 3 Aqueous solution, 1.0mol·L -1 NaF aqueous solution. Take 2.25mL LaCl 3 Aqueous solution, 1.00mL CeCl 3 The aqueous solution, 2mL NaF aqueous solution, 20mL ethanol and 10mL oleic acid were mixed in the reaction kettle, stirred for 30min, and heated at 200°C for 8h. After the reaction is over, stand still, wait for the temperature to drop to room temperature, suck out the supernatant in the reaction kettle, centrifuge the remaining suspension at 6000 rpm for 5 min, remove the supernatant, and add 4-5 mL of 2mol·L to the remaining precipitate -1 Hydrochloric acid, ultrasonic dispersion (for example, the ultrasonic power is 300W, the ultrasonic time is 30 minutes). Then, 4-5 mL of absolute ethanol was added, and then centrifuged at...

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Abstract

The embodiment of the invention relates to the technical field of nitrite detection, in particular to a chemiluminiscence enhancer, a preparation method thereof and applicationthereof in nitrite detection. The chemiluminiscence enhancer comprises rare earth fluoride with nanometer granularity, the rare earth fluoride is doped with cerium element, and the valence state of the cerium element is positive trivalent; the rare earth elements in the cerium element and the rare earth fluoride are different elements, and the molar ratio of the cerium element to the rare earth elements in the rare earthfluoride is (1:10)-(3:10). The chemiluminiscence enhancer can enhance chemiluminiscence in the nitrite detection process, so that the detection effect of detecting nitrite by using a chemiluminiscence method is improved.

Description

Technical field [0001] The embodiments of this specification relate to the technical field of nitrite detection, in particular to a chemiluminescence enhancer and its preparation method and its use in detecting nitrite. Background technique [0002] Nitrite is widely distributed in vegetables, drinking water, food and even physiological systems. Under certain conditions, it can form nitrosamines, which has certain harmful effects on the human body. The chemical properties of nitrite are very unstable, therefore, rapid detection of nitrite is very important. [0003] The most common detection methods are chromatography, spectrophotometry, electrochemical methods, and chemiluminescence methods. The traditional detection error is large and the procedure is more complicated. Although the electrochemical method has fast response and simple operation, the equipment required for detection is relatively expensive, which limits its wide application. [0004] As a powerful analysis techniqu...

Claims

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Application Information

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IPC IPC(8): G01N21/76G01N21/64C09K11/85
CPCC09K11/7772G01N21/6402G01N21/76
Inventor 吴静王嫣然黄春霞
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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