Method for detecting formaldehyde in environmental water using carbon-foam copper material as working electrode

A technology for detecting environment and working electrodes, applied in the field of electrochemical analysis and detection, can solve the problems of unstable electrode performance, slow detection process, low detection sensitivity, etc., and achieve the effects of good reproducibility, fast analysis speed and low detection cost

Active Publication Date: 2021-05-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, although there are methods and technical solutions for detecting formaldehyde using electrochemical detection systems and working electrodes, such as the Chinese invention patent application document 201410104072.0, the detection sensitivity is low, the electrode performance is unstable, and the detection process is slow. Graphene is used as an electrode to form an electrochemical platform to detect formaldehyde is relatively rare

Method used

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  • Method for detecting formaldehyde in environmental water using carbon-foam copper material as working electrode
  • Method for detecting formaldehyde in environmental water using carbon-foam copper material as working electrode
  • Method for detecting formaldehyde in environmental water using carbon-foam copper material as working electrode

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Embodiment 1

[0031] This embodiment provides a method for preparing a carbon-copper foam material as a highly sensitive formaldehyde sensor, comprising the following steps:

[0032] S1: 1g of graphite, concentrated H 2 SO 4 、H 3 PO 4 The three are placed in a three-necked beaker, and the concentrated H 2 SO 4 、H 3 PO 4 The volume ratio of the solution was 9:1, and 6 g of potassium permanganate was added in portions, and stirred for 1 h in an ice-water bath. The temperature was raised to 50°C, and the reaction was kept for 12 hours. Pour the obtained product into ice water, add an appropriate amount of hydrogen peroxide until the solution turns golden yellow, filter, and wash the product until the pH is close to 7. The graphene oxide solution was prepared by the improved hummers method, and after the preparation was completed, it was stored in the dark at room temperature for later use;

[0033] S2: Cut the foamed copper material into strips of 1cm×10cm. After the surface is ultrason...

Embodiment 2

[0041] This embodiment provides a method for preparing a carbon-copper foam material as a highly sensitive formaldehyde sensor, comprising the following steps:

[0042] S1: 1g of graphite, concentrated H 2 SO 4 、H 3 PO 4 The three are placed in a three-necked beaker, and the concentrated H 2 SO 4 、H 3 PO 4 The volume ratio of the solution was 9:1, and 6 g of potassium permanganate was added in portions, and stirred for 1 h in an ice-water bath. The temperature was raised to 50°C, and the reaction was kept for 12 hours. Pour the obtained product into ice water, add an appropriate amount of hydrogen peroxide until the solution turns golden yellow, filter, and wash the product until the pH is close to 7. The graphene oxide solution was prepared by the improved hummers method, and after the preparation was completed, it was stored in the dark at room temperature for later use;

[0043] S2: Cut the foamed copper material into strips of 2cm×12cm. After the surface is ultras...

Embodiment 3

[0051] This embodiment provides a method for preparing a carbon-copper foam material as a highly sensitive formaldehyde sensor, comprising the following steps:

[0052] S1: 1g of graphite, concentrated H 2 SO 4 、H 3 PO 4 The three are placed in a three-necked beaker, and the concentrated H 2 SO 4 、H 3 PO 4 The volume ratio of the solution was 9:1, and 6 g of potassium permanganate was added in portions, and stirred for 1 h in an ice-water bath. The temperature was raised to 50°C, and the reaction was kept for 12 hours. Pour the obtained product into ice water, add an appropriate amount of hydrogen peroxide until the solution turns golden yellow, filter, and wash the product until the pH is close to 7. The graphene oxide solution was prepared by the improved hummers method, and after the preparation was completed, it was stored in the dark at room temperature for later use;

[0053] S2: Cut the foamed copper material into strips of 3cm×15cm, and after the surface is ul...

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Abstract

The invention discloses a preparation method of a carbon-copper foam material and a method for using it as a working electrode to detect formaldehyde in environmental water bodies. After the graphene oxide impregnation solution was prepared by the improved hummers method, the rectangular copper foam material was immersed in it and then dried and heated and annealed at high temperature under anaerobic conditions to obtain a carbon-copper foam material as a highly sensitive formaldehyde sensor. The carbon-copper foam material was adopted The material is used as the working electrode, Ag / AgCl is used as the reference electrode, and platinum wire is used as the counter electrode. The linear regression equation corresponding to the formaldehyde and the characteristic response current value is drawn by cyclic voltammetry, and the measurement The characteristic response current value of the pretreated environmental water body to be tested is substituted into the linear regression equation, and the formaldehyde concentration in the water body sample is obtained by calculation. The electrode of the formaldehyde sensor provided by the invention has stable performance and good reproducibility, and the formaldehyde analysis speed in the environmental water body is fast and the detection cost is low.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and in particular relates to a method for detecting formaldehyde in an environmental water body by using a carbon-copper foam material as a working electrode. Background technique [0002] Formaldehyde, also known as formaldehyde, has a relative molecular mass of 30.03, a relative density (in air) of 1.067, a liquid phase (to water) density of 0.815 at 20°C, a melting point of -92°C, and a boiling point of -21°C. Formaldehyde is easily soluble in water, and is extremely volatile at room temperature, and the volatilization speed is accelerated as the temperature rises. The aqueous solution containing 37% to 40% formaldehyde and 8% methanol is called "formalin" solution, which is often used as a fungicide and preservative. Formaldehyde is easy to oxidize and polymerize, and its concentrated solution can automatically polymerize into a three-molecular cyclic polymer a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/30G01N27/48
Inventor 王颖李风亭翟咏昕
Owner TONGJI UNIV
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