A kind of ammonia gas sensing film based on hpts and hydrotalcite nanosheets and preparation method thereof

A technology for sensing thin films and nanosheets, applied in hydrotalcite, chemical instruments and methods, fluorescence/phosphorescence, etc., can solve the problems of time-consuming, slow response time, high cost, etc., and achieve improved optical performance and thermal stability, good transparency The effects of lightness and film formation, and excellent reproducibility

Active Publication Date: 2022-07-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, methods based on ion chromatography, colorimetry, amperometric method, and fluorescence method to detect ammonia have been widely used, but these detection technologies have disadvantages such as complicated operation, large equipment, and high cost.
At the same time, sensing technologies for detecting ammonia based on metal oxides, graphene, carbon nanotubes, conductive polymers and other substances have also been widely studied, but there are also problems such as time-consuming, labor-intensive, and slow response time.

Method used

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  • A kind of ammonia gas sensing film based on hpts and hydrotalcite nanosheets and preparation method thereof
  • A kind of ammonia gas sensing film based on hpts and hydrotalcite nanosheets and preparation method thereof
  • A kind of ammonia gas sensing film based on hpts and hydrotalcite nanosheets and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step A: Preparation of monolayer hydrotalcite nanosheets

[0022] Hydrotalcite nanosheets were prepared by the double drop method. 0.004mol Mg(NO 3 ) 2 ·6H 2 O and 0.001mol Al (NO 3 ) 3 ·9H 2 O (molar ratio of 4:1) dissolved in cooled, boiled, through N 2 In deionized water, mixed salt solution was prepared, dissolved in 100mL water; NaOH solution with concentration of 0.25M was prepared. The concentration of 0.01M NaNO 3 100 mL of the solution and 100 mL of N,N dimethylformamide solution with a concentration of 0.01 M were added to the three-necked flask for magnetic stirring to dissolve, and the temperature was pre-heated to 80°C. After waiting for the temperature to stabilize, add NaOH solution dropwise to the three-necked flask to adjust pH=10, and then dropwise add mixed salt solution and NaOH solution to the three-necked flask at the same time, control pH=10, cool, centrifuge and wash after the dropwise addition is completed, Monolayer hydrotalcite nanosh...

Embodiment 2

[0029] Step A: Preparation of monolayer nanosheet hydrotalcite

[0030] Hydrotalcite nanosheets were prepared by double drop method. 0.003mol Mg(NO 3 ) 2 ·6H 2 O and 0.001mol Al (NO 3 ) 3 ·9H 2 O (molar ratio of 3:1) dissolved in cooled, boiled, through N 2 and deionized water, prepare a mixed salt solution and dissolve it in 100 mL of water; prepare a NaOH solution with a concentration of 0.25M. The concentration of 0.01M NaNO 3 100 mL of the solution and 100 mL of N,N dimethylformamide solution with a concentration of 0.01 M were added to the three-necked flask for magnetic stirring to dissolve, and the temperature was pre-heated to 75°C. After waiting for the temperature to stabilize, add NaOH solution dropwise to the three-necked flask to adjust pH=10.5, and then add the mixed salt solution and NaOH solution dropwise to the three-necked flask at the same time, control pH=10, after the dropwise addition is completed, cool, centrifuge and wash, Monolayer hydrotalcit...

Embodiment 3

[0036] Step A: Preparation of monolayer nanosheet hydrotalcite

[0037] Hydrotalcite nanosheets were prepared by double drop method. 0.002mol Mg(NO 3 ) 2 ·6H 2 O and 0.001mol Al (NO 3 ) 3 ·9H 2 O (molar ratio of 2:1) was dissolved in the cooled boiled and passed N 2 In deionized water, the mixed salt solution was dissolved in 100 mL of water; the NaOH solution with a concentration of 0.25M was prepared. The concentration of 0.01M NaNO 3 100 mL of the solution and 100 mL of N,N dimethylformamide solution with a concentration of 0.01 M were added to the three-necked flask for magnetic stirring and dissolution, and the temperature was pre-heated to 70°C. After waiting for the temperature to stabilize, add NaOH solution dropwise to the three-necked flask to adjust pH=10, then dropwise add mixed salt solution and NaOH solution to the three-necked flask at the same time, control pH=9.5, cool, centrifuge and wash after the dropwise addition is completed, Monolayer hydrotalci...

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Abstract

The invention discloses an ammonia gas sensing film based on HPTS and hydrotalcite nanosheets and a preparation method thereof. The film is made by solvent evaporation of three components, HPTS, hydrotalcite nanosheets and polyvinyl alcohol. Among them, hydrotalcite nanosheets and polyvinyl alcohol immobilize and disperse HPTS molecules, reducing their vibration and rotation, making them exhibit excellent fluorescence properties. The ammonia gas sensing film prepared by the invention has good light transmittance and film-forming property. Compared with the HPTS aqueous solution, the ammonia gas sensing applied to ammonia gas shows a wider linear detection range and a lower detection limit, and the detection limit can be Up to 0.1‑0.01ppm, and the film has excellent reproducibility, fluorescence performance, and light stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of thin film sensors for detecting ammonia gas, and particularly relates to an ammonia gas sensing thin film based on HPTS and hydrotalcite nanosheets and a preparation method thereof. Background technique [0002] Ammonia is a colorless, highly toxic gas with a pungent odor. Because it may affect the immune system or inhibit cell growth, it is very harmful to the human body. at a concentration of 25ppm NH 3 At 35ppm, the human body's tolerance limit is 8 hours; at 35ppm, the human body's tolerance limit is only 15 minutes. Therefore, it is necessary to develop a sensor to detect low-concentration ammonia gas. At present, the detection methods of ammonia gas based on ion chromatography, colorimetry, amperometric method and fluorescence method have been widely used, but these detection technologies have the disadvantages of complicated operation, large equipment and high cost. At the same t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06G01N21/64C01F7/785
CPCC09K11/06G01N21/6428
Inventor 史文颖孔健
Owner BEIJING UNIV OF CHEM TECH
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