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Formaldehyde detection test paper based on nano-composite fiber and preparation method and application thereof

A nano-composite fiber and detection test paper technology, which can be used in measurement devices, analysis by chemical reaction of materials, and material analysis by observing the influence of chemical indicators, etc. Problems such as expensive operation to achieve improved detection limit and accuracy, excellent hydrophilicity and water absorption, and excellent color change

Active Publication Date: 2022-01-28
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned existing problems, the present invention provides a formaldehyde detection test paper based on nanocomposite fibers to solve the above ① expensive equipment and cumbersome operation, poor portability ② poor stability ③ cumbersome pretreatment and harsh operating conditions ④ small specific surface area leads to detection time Longer and higher detection limit ⑤ The disadvantages of expensive raw materials and serious environmental pollution of products

Method used

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  • Formaldehyde detection test paper based on nano-composite fiber and preparation method and application thereof
  • Formaldehyde detection test paper based on nano-composite fiber and preparation method and application thereof
  • Formaldehyde detection test paper based on nano-composite fiber and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Add 0.1 g of fumed hydrophilic silica into 18.7 g of 99.8% N, N-dimethylformamide with a mass fraction of 99.8% and sonicate for 1 hour at room temperature.

[0039] (2) At room temperature, 1.2g polyacrylonitrile (average molecular weight 150000) was dissolved in 18.8gN, 1000 revs per minute in the mixed solution of N-dimethylformamide and silicon dioxide, stirred for 8 hours, and the mass fraction obtained was 0.5% fumed hydrophilic silica in 6% polyacrylonitrile spinning dope.

[0040] (3) Under the condition that the relative humidity of the room temperature is 40%, the spinning dope is electrospun with a boost speed of 1.2 ml per hour and the needle is connected to a high voltage of 10,000 volts. The receiving device is aluminum foil, and the needle and the receiving drum are The distance between them was 15 cm, and a polyacrylonitrile nanofiber film composited with nanoparticles was obtained. The fiber membrane was dried in a vacuum oven at 0.1 degree of vacu...

Embodiment 2

[0045] The mass of gas-phase hydrophilic silica in step (1) in Example 1 was set to 0.2 g, and the mass of N,N-dimethylformamide was set to 18.6 g.

[0046] In the step (2) of Example 1, a 6% polyacrylonitrile spinning stock solution with a mass fraction of 1% fumed hydrophilic silica was obtained.

[0047] Steps (3)(4)(5) are all unchanged.

[0048]At room temperature, place the test paper in an environment containing different concentrations of formaldehyde gas for 30 minutes, the test paper will turn from yellow to pink and pink in sequence, and then use a high-sensitivity UV-visible spectrophotometer to measure the absorbance. The change of the characteristic peak absorbance value before and after the gas is used to judge the degree of reaction. Repeating the above steps shows that the detection range is 25ppb-5ppm, the variation range of the characteristic peak absorbance value is about Δu=0.55, and the specific surface area of ​​the test paper is 80.05 square meters per...

Embodiment 3

[0050] The mass of gas-phase hydrophilic silica in step (1) in Example 1 was set to 0.3 g, and the mass of N,N-dimethylformamide was set to 18.5 g.

[0051] In the step (2) of Example 1, a 6% polyacrylonitrile spinning stock solution with a mass fraction of 1.5% gas-phase hydrophilic silica was obtained.

[0052] Steps (3)(4)(5) are all unchanged.

[0053] At room temperature, place the test paper in an environment containing different concentrations of formaldehyde gas for 30 minutes, the test paper will turn from yellow to pink and pink in sequence, and then use a high-sensitivity UV-visible spectrophotometer to measure the absorbance. The change of the characteristic peak absorbance value before and after the gas is used to judge the degree of reaction. Repeating the above steps shows that the detection range is 50ppb-5ppm, the variation range of the characteristic peak absorbance value is about Δu=0.58, and the specific surface area of ​​the test paper is 94.89 square met...

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Abstract

The invention belongs to the field of nano functional materials, and discloses formaldehyde detection test paper based on nano-composite fibers and a preparation method and application thereof, and the preparation method comprises the following steps: (1) adding hydrophilic vapor-phase silicon dioxide into a solvent, and carrying out ultrasonic oscillation dispersion; (2) dissolving polyacrylonitrile in the mixed solution in the step (1), and performing stirring to obtain a polymer solution of polyacrylonitrile and SiO2; (3) performing electrostatic spinning on the polymer solution obtained in the step (2) to prepare composite fiber paper; and (4) dipping the composite fiber paper in a color developing treatment solution to obtain the formaldehyde detection test paper, wherein the developing treatment liquid contains a compound containing a hydroxylamine functional group and a derivative of the compound. The test paper provided by the invention has the advantages of visual color change, high selectivity, good stability, portability, normal use under low humidity, lower detection limit than the same type of test paper, and color change with a certain rule along with the increase of concentration; production equipment is simple and easy to operate, and used raw materials and other reagents are low in cost.

Description

technical field [0001] The invention relates to the preparation of formaldehyde detection test paper based on nanocomposite fibers, and belongs to the field of nanometer functional materials. Background technique [0002] Formaldehyde is a key reagent for the synthesis of raw materials in various fields in the process of modern development, and is widely used in key fields such as resin, plastic manufacturing, industrial supplies, agriculture, and various household decoration products. Formaldehyde is widely used in our living space and work space due to its wide range of applications. The current national standard requires that the formaldehyde content in the air should not be higher than 60ppb. At present, the main methods for conventional detection of gas formaldehyde are: [0003] 1. Although high-performance liquid chromatography and gas chromatography are accurate in detection, the expensive and cumbersome operation steps of the instrument and the cumbersome instrume...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/783G01N2021/775Y02A50/20
Inventor 王立世陈思宇夏启斌
Owner SOUTH CHINA UNIV OF TECH
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