Construction of ultra-sensitive electrochemiluminescence sensor and application thereof to aspect of trinitrotoluene detection

An electrochemistry and sensor technology, applied in the field of ultra-sensitive electrochemiluminescence sensors, can solve the problems of complex pretreatment process, huge equipment, limited application, etc., achieve good optical stability and thermal stability, small size, storage long time effect

Inactive Publication Date: 2017-08-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these detection methods have many limitations, such as high cost, high detection limit, complex pretreatment process and bulky equipment, which limit their practical applications

Method used

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  • Construction of ultra-sensitive electrochemiluminescence sensor and application thereof to aspect of trinitrotoluene detection
  • Construction of ultra-sensitive electrochemiluminescence sensor and application thereof to aspect of trinitrotoluene detection
  • Construction of ultra-sensitive electrochemiluminescence sensor and application thereof to aspect of trinitrotoluene detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Preparation of hydrotalcite precursor: weigh 2.33g CoCl 2 ·6H 2 O(10mM), 1.90g Al(NO 3 ) 3 ·6H 2 O (5mM) and 3.0g urea (30mM) were dissolved in 800ml of deionized water to obtain the mixed solution A of the three chemicals, poured the mixed solution A into a three-necked bottle, heated and stirred in an oil bath at 97°C for 48h, And carry out condensation and reflux, to obtain the solution B after the reaction. Then, the reacted solution B was centrifuged and washed several times until the pH value of the supernatant was less than 8, and then the precipitate R1 obtained after centrifugation and washing was dried at 70°C for 24 hours to obtain the hydrotalcite intermediate CoAl-CO 3 LDHs. After that, weigh 0.5gCoAl-CO 3 LDHs with 127.5g NaNO 3 Mix in 0.225ml to CO 2 water to obtain the mixed solution C, put the mixed solution C in a three-necked flask, and add 0.225ml of concentrated HNO 3 , under the protection of nitrogen, vigorously stirred the reaction ...

Embodiment 2

[0049] (1) With embodiment 1, prepare hydrotalcite precursor (CoAl-NO 3 LDHs).

[0050] (2) Preparation of CoAl-NO intercalated with luminol monosodium salt (AMS) 3 LDHs: First weigh 0.51g CoAl-NO 3 LDHs and 0.152g of AMS were dissolved in 102ml of CO removal 2 water to obtain the mixed solution D, put the mixed solution D in a 150ml three-necked flask, stir and react for 50h under the protection of nitrogen, and the obtained product is depleted of CO 2 Water was centrifuged to obtain precipitate R3, which was then used to remove CO 2 The precipitate R3 was washed with water, and the upper layer was centrifuged to obtain an AMS-CoAl LDHs colloidal solution. The obtained precipitate R3 was dried in an oven at 70°C for 26 hours to obtain an AMS-CoAl LDHs sample.

[0051] (3) Prepare a CdTe QDs solution with a concentration of 1.0 mg / mL; prepare a PDDA solution with a concentration of 1 g / ml, and store them in volumetric flasks in the dark.

[0052] (4) Take a tin-doped indi...

Embodiment 3

[0056] (1) With embodiment 1, prepare hydrotalcite precursor CoAl-NO 3 LDHs.

[0057] (2) Preparation of CoAl-NO intercalated with luminol monosodium salt (AMS) 3 LDHs: First weigh 0.50g CoAl-NO 3 LDHs and 0.148g of AMS were dissolved in 101ml of CO removal 2 water to obtain a mixed solution D, put the mixed solution D in a 150ml three-necked flask, stir and react for 51h under nitrogen protection, and the obtained product is depleted of CO 2 Water was centrifuged to obtain precipitate R3, which was then used to remove CO 2 The precipitate R3 was washed with water, and the upper layer was centrifuged to obtain an AMS-CoAl LDHs colloidal solution. The obtained precipitate R3 was dried in an oven at 70°C for 24 hours to obtain an AMS-CoAl LDHs sample.

[0058] (3) Prepare a CdTe QDs solution with a concentration of 1.0 mg / ml; prepare a PDDA solution with a concentration of 1 g / ml, and store them in volumetric flasks in the dark.

[0059] (4) Take an ITO sheet with a size of...

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Abstract

The invention belongs to the technical field of sensor preparation, and discloses construction of an ultra-sensitive electrochemiluminescence sensor and an application thereof to the aspect of trinitrotoluene detection. Micromolecular Luminol monosodium salt with negative electricity is inserted into hydrotalcite layers, hydrotalcite with Luminol intercalation and quantum dots with negative electricity are used in order to form an ECL sensor with a supermolecular composite film by means of electrostatic attraction layer by layer self assembly technology, and an ECL resonant energy transfer (ERET) system for detecting TNT is formed. The sensor is doublet detection, the ERET method is used for substantially enhancing ECL signals of luminal-quantum dots, and sensitivity and accuracy of TNT detection are substantially improved. In addition, the sensor has long service life and good stability; the sensor has small volume, high sensitivity, and low reagent loss, and is portable; the sensor can satisfy needs of TNT detection at the present stage.

Description

technical field [0001] The invention belongs to the technical field of sensor preparation, in particular to an ultrasensitive electrochemiluminescence sensor, its preparation method and application, more specifically to an ultrasensitive electrochemiluminescence sensor, its preparation method and the trinitrogen Applications in the detection of toluene (TNT). Background technique [0002] Trinitrotoluene (TNT) is a typical representative of chemical explosives, which has been widely used in military, industrial and civil fields. However, TNT is a toxic substance for plants, fungi, animals and humans, and due to military activities and mine operations, TNT has caused serious pollution to soil and water. In addition, with the spread of international terrorism and the increasingly severe global security issues, the detection of TNT in airports, subways, stations and other public places has become more and more important and urgent. Therefore, starting from the actual needs of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/66
CPCG01N21/66
Inventor 闫东鹏李智雄周宇琼卫敏
Owner BEIJING UNIV OF CHEM TECH
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