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Method for detecting chlorpyrifos based on photoelectrochemical sensor

A photoelectrochemical and chlorpyrifos technology, which is applied in the preparation of photoelectrochemical sensors and the detection of chlorpyrifos, can solve the problems of complex instrument, long response time, low selectivity and sensitivity, etc., and achieves fast analysis speed, low detection limit and high sensitivity. Effect

Active Publication Date: 2019-11-22
CHANGZHOU UNIV
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  • Abstract
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Problems solved by technology

[0005] In view of the shortcomings of existing chlorpyrifos detection methods such as complicated instruments, long response time, low selectivity and sensitivity, the purpose of the present invention is to provide a low-cost, fast and highly sensitive photoelectrochemical sensor detection method

Method used

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  • Method for detecting chlorpyrifos based on photoelectrochemical sensor
  • Method for detecting chlorpyrifos based on photoelectrochemical sensor
  • Method for detecting chlorpyrifos based on photoelectrochemical sensor

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Embodiment

[0024] (1) Preparation of Ti 3 C 2 -AgBr modified ITO electrode

[0025] (1) Ti 3 C 2 - Preparation of AgBr composite material:

[0026] Add 8mL Ti to a 50mL one-necked flask 3 C 2 solution (0.6mg / mL), 8mL ethylene glycol solution and ultrasonication for 20min, then add 195.9903mg of 1-hexadecyl-3-methylimidazolium bromide, and react at room temperature for 30min. Then accurately weigh 85.9312mg AgNO 3 Dissolve it in 2mL of ammonia water, slowly drop it into the above-mentioned one-necked flask, and put it in an oil bath at 90°C for 6h. After the oil bath was completed, the supernatant was discarded by centrifugation, washed three times with water, and the precipitate was freeze-dried for 12 hours to obtain Ti 3 C 2 -AgBr composite material (wherein, Ti 3 C 2 The doping mass of the composite material is 5%), stored at room temperature and protected from light. Take 20mg Ti 3 C 2 - The AgBr composite material was dispersed in 10 mL of DMF for use.

[0027] (2) IT...

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Abstract

The invention belongs to the field of photoelectrochemical detection, and relates to a method for detecting chlorpyrifos based on a photoelectrochemical sensor. The method comprises the following steps: preparing a titanium carbide-silver bromide nano-composite (Ti3C2-AgBr) by utilizing a wet chemical method; and then modifying the Ti3C2-AgBr nanomaterial on the surface of an electrode of indium tin oxide (ITO) conductive glass, and constructing a sensitive chlorpyrifos photoelectrochemical sensor based on the mechanism of inhibiting the photocurrent of the Ti3C2-AgBr nanomaterial by chlorpyrifos. The detection range of the method is 1.0*10<-9>-1.0*10<-6> mg / L, and the lowest detection limit is 0.33*10<-9> mg / L. The method for detecting the chlorpyrifos is simple to operate, high in sensitivity, good in selectivity and low in detection cost.

Description

technical field [0001] The invention belongs to the field of photoelectrochemical detection, and relates to a method for preparing a photoelectrochemical sensor and being used for the detection of chlorpyrifos. Especially relate to a kind of indium tin oxide (being commonly called as ITO) electrode surface modification titanium carbide-silver bromide (Ti 3 C 2 -AgBr) nanocomposites, namely with Ti 3 C 2 -AgBr / ITO electrode is the working electrode, and it is a photoelectrochemical analysis method for the quantitative detection of chlorpyrifos in water. Background technique [0002] Chlorpyrifos (Chlorpyrifos, referred to as CPF), also known as chlorpyrifos, Lesben, the chemical formula is C 9 h 11 Cl 3 NO 3 PS, belonging to organophosphorus pesticides, is a World Health Organization Class II moderately harmful pesticide. Chlorpyrifos is a white granular crystal that is easily soluble in most organic solvents. As a broad-spectrum insecticide and acaricide, its residu...

Claims

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Application Information

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IPC IPC(8): G01N27/327
CPCG01N27/327
Inventor 秦明蒋鼎陈智栋
Owner CHANGZHOU UNIV
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