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Cellulose-heteropoly acid proton exchange membrane for electrochemical sensor and preparation method therefor

A proton exchange membrane and cellulose technology, applied in the field of cellulose-heteropolyacid proton exchange membranes for electrochemical sensors, can solve the problems of increasing the complexity of the system, reducing the sensitivity and reliability of the catalytic layer, and achieving simple processing and molding , low cost, good chemical stability

Active Publication Date: 2015-12-09
广东南海普锐斯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For sensors with this structure, the application of the second porous matrix membrane storage tank enables the electrolyte carried by the electrochemical component to be replenished within a certain period of use, but the introduction of the storage tank component increases the complexity of the system, and the electrolyte must pass through Only the catalytic layer can reach the proton exchange membrane, which reduces the sensitivity and reliability of the catalytic layer

Method used

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  • Cellulose-heteropoly acid proton exchange membrane for electrochemical sensor and preparation method therefor
  • Cellulose-heteropoly acid proton exchange membrane for electrochemical sensor and preparation method therefor
  • Cellulose-heteropoly acid proton exchange membrane for electrochemical sensor and preparation method therefor

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Embodiment 1

[0029] A preparation method of cellulose-heteropolyacid proton exchange membrane for electrochemical sensor, comprising the following steps:

[0030] (1) Mix wood pulp cellulose with a polymerization degree of 600, sodium hydroxide, urea, and water in a mass ratio of 1:0.3:0.2:5, and stir in an ice bath for 4 hours to obtain a cellulose carbamate solution;

[0031] (2) Add phosphotungstic acid with a mass ratio of 0.3 (relative to cellulose) into the cellulose carbamate solution prepared in step (1), and stir at room temperature for 2 hours to obtain a phosphotungstic acid-cellulose carbamate solution;

[0032] (3) Scrape-coat the phosphotungstic acid-cellulose carbamate solution prepared in step (2) into a liquid film, and after volatilizing the solvent at 95°C, soak it in 0.5 mol / liter sulfuric acid for 10 minutes to make the cellulose carbamate The acid ester is regenerated into cellulose, then washed with deionized water for 1-3 times, and dried at 80-100°C to obtain a cel...

Embodiment 2

[0037] A preparation method of cellulose-heteropolyacid proton exchange membrane for electrochemical sensor, comprising the following steps:

[0038] (1) Mix cotton pulp cellulose with a polymerization degree of 300, sodium hydroxide, urea, and water in a mass ratio of 1:0.05:0.1:20, and stir in an ice bath for 1 hour to obtain a cellulose carbamate solution;

[0039] (2) Add silicotungstic acid with a mass ratio of 0.1 (relative to cellulose) into the cellulose carbamate solution prepared in step (1), and stir at room temperature for 0.5h to obtain a silicotungstic acid-cellulose carbamate solution ;

[0040] (3) Scrape-coat the silicotungstic acid-cellulose carbamate solution prepared in step (2) into a liquid film, and after volatilizing the solvent at 60°C, soak it in 0.1 mol / liter sulfuric acid for 5 minutes to make the cellulose carbamate The acid ester was regenerated into cellulose, then washed once with deionized water, and dried at 100°C to obtain a cellulose-silico...

Embodiment 3

[0044] A preparation method of cellulose-heteropolyacid proton exchange membrane for electrochemical sensor, comprising the following steps:

[0045] (1) Mix wood pulp cellulose with a degree of polymerization of 400, sodium hydroxide, urea, and water in a mass ratio of 1:0.4:0.14:12, and stir in an ice bath for 3 hours to obtain a cellulose carbamate solution;

[0046] (2) Add phosphomolybdic acid with a mass ratio of 0.24 (relative to cellulose) into the cellulose carbamate solution prepared in step (1), and stir at room temperature for 1 h to obtain a phosphomolybdic acid-cellulose carbamate solution;

[0047] (3) Scrape-coat the phosphomolybdic acid-cellulose carbamate solution prepared in step (2) into a liquid film, and after volatilizing the solvent at 75°C, soak it in 1 mol / liter of sulfuric acid for 30 minutes to make the cellulose carbamate The ester was regenerated into cellulose, then washed twice with deionized water, and dried at 80°C to obtain a cellulose-phosph...

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Abstract

The invention discloses a cellulose-heteropoly acid proton exchange membrane for an electrochemical sensor and a preparation method therefor. Heteropoly acid is loaded on functional groups of cellulose derivatives through an ion self assembly technology, then acid processing is carried out, the cellulose derivatives is regenerated into cellulose and the cellulose-heteropoly acid proton exchange membrane is formed. The preparation method comprises the following steps: cellulose, sodium hydroxide and urea are dissolved in water in proportions and cellulose carbamate is formed; then heteropoly acid is added and self assembly of the heteropoly acid and cellulose carbamate is carried out, a liquid membrance is formed through tape casting or blade coating, after drying is carried out, cellulose regeneration in sulfuric acid is carried out, washing is carried out, drying is carried out again and the proton exchange membrane is obtained. The prepared cellulose-heteropoly acid proton exchange membrane is applied in an electrochemical sensor, a storage tank structure is not needed, there is no electrolyte loss, the system is simple and there is no influence on a catalysis layer. In addition, because heteropoly acid proton conduction is independent of humidity, the conductivity change value is small under a condition that temperature and humidity change.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and in particular relates to a cellulose-heteropolyacid proton exchange membrane for an electrochemical sensor and a preparation method thereof. Background technique [0002] Formaldehyde is one of the main pollutants in indoor air. As a protoplasmic poison, formaldehyde has long-term, latent and concealed hazards to human health. The World Health Organization has listed formaldehyde as an important environmental pollutant, and stipulates that the maximum allowable concentration of formaldehyde indoors shall not exceed 80ppb. my country also stipulates that the maximum allowable concentration of formaldehyde in indoor air shall not exceed 60ppb (GB / T16127-1995). Due to the difficulty of in-situ and rapid detection of low-concentration formaldehyde gas by traditional formaldehyde detection methods, high-sensitivity formaldehyde gas sensors, especially fuel cell-type electrochemical sensors w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/403G01N27/407
Inventor 唐浩林袁定胜
Owner 广东南海普锐斯科技有限公司
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