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Preparation of a silver-melamine nanocomposite test paper and its application in formaldehyde adsorption and rapid measurement

A technology of silver-melamine and nano-composite materials, which is applied in the field of pollutant removal and sensing and detection, can solve the problems of unsatisfactory field application and complicated operation process, and achieve the effects of short detection time, efficient adsorption and removal, and easy operation

Active Publication Date: 2021-01-15
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods often require expensive laboratory equipment, complicated operating procedures, and professional operating techniques. They are only suitable for the determination of formaldehyde under laboratory conditions and cannot meet the requirements of field applications.

Method used

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  • Preparation of a silver-melamine nanocomposite test paper and its application in formaldehyde adsorption and rapid measurement
  • Preparation of a silver-melamine nanocomposite test paper and its application in formaldehyde adsorption and rapid measurement
  • Preparation of a silver-melamine nanocomposite test paper and its application in formaldehyde adsorption and rapid measurement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Preparation of silver-melamine nanocomposite test strips and rapid detection of formaldehyde

[0036] Include the following steps:

[0037] 1) Preparation of silver-melamine nanocomposites:

[0038] Weigh 15 mg of gelatin, add 5 mL of ultrapure water to it, heat to dissolve at 50 °C, and then cool to room temperature. Add 8.5 mg of silver nitrate to the above aqueous gelatin solution, shake and dissolve to obtain a 10 mM aqueous solution of silver nitrate. In addition, weigh 9.45 mg of melamine and mix it with 5 mL of ultrapure water, stir to dissolve, if insoluble, heat at 60 °C to dissolve and cool to room temperature to obtain 15 mM melamine aqueous solution. Then, 5 mL of the mixed solution of silver nitrate and gelatin was added thereto under slow stirring, and after standing for 1.5 h, a milky white suspension was obtained ( figure 2 ), that is, gelatin-coated silver–melamine nanocomposites.

[0039] 2) Preparation of hydrophobic glass plates

[0...

Embodiment 2

[0047] Embodiment 2: the rapid detection of formaldehyde in the actual sample

[0048] Collect several kinds of water-fat foods from the market for formaldehyde content detection: take an appropriate amount of samples and crush them in a pulverizer, accurately weigh 1.0 g of crushed water-fat foods with a portable electronic balance, and put them into an extraction bottle with a scale line , add 10.0 mL of ultrapure water, add 0.5 mL of potassium ferrocyanide with a mass fraction of 5 % and 0.5 mL of a zinc acetate solution with a mass fraction of 5 %, dilute to 20.0 mL with deionized water, stir well and put into boiling water Heat in the bath for 5 min, filter the solution while hot, centrifuge, and take the supernatant. Dip the silver-melamine nanocomposite functionalized test strip into 1 mL of the above supernatant and let it stand for about 15 min. After the color is stable, compare the color of the test strip after reaction with the standard color established in step 1)...

Embodiment 3

[0052] Example 3: Adsorption removal of formaldehyde

[0053] Four identical airtight reactors (80 cm × 80 cm × 80 cm) were made to simulate the indoor environment. The four reactors were all made of colorless transparent plastic, and the top center of the reactor was opened (sealable) as a sample hole.

[0054] Control group 1: Reactor without treatment;

[0055] Experimental group 1: The prepared silver-melamine nanocomposite material (stock solution 240 mL) was coated on the four vertical inner walls of the reactor;

[0056] Control group 2: spread four non-woven fabrics (80 cm × 80 cm) on the inner wall of the reactor;

[0057] Experimental group 2: The silver-melamine nanocomposite material (stock solution 240 mL) was coated on four non-woven fabrics (80 cm × 80 cm), and the non-woven fabrics were spread on the inner wall of the reactor.

[0058] Place the prepared formaldehyde solution of the same dose at the bottom of the reactor respectively, wait for the same time t...

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Abstract

The invention belongs to the technical field of pollutant removal and sensing detection and relates to a preparation method of silver-melamine nanocomposite material test paper and its application informaldehyde adsorption and fast detection. A silver-melamine nanocomposite material is synthesized by adopting a supramolecular self-assembly way and is attached to a test paper strip, the test paperstrip utilizes efficient formaldehyde adsorption and combination of the silver-melamine nanocomposite material, then utilizes the reducibility of formaldehyde under alkaline condition to reduce silver in the silver-melamine nanocomposite material into a precipitate visual black silver, and fast detection and visual colorimetric analysis of the formaldehyde are achieved. By determining the light reflecting intensity of the developing test paper strip after drying, and accurate formaldehyde quantification is achieved. Results indicate that a formaldehyde adsorption and fast detection technologyof the invention has the advantages of being simple, quick, portable and the like and can be applied to visual and fast detection of formaldehyde in water-swollen foods. In addition, the silver-melamine nanocomposite material is applied to a common adsorption support and used for adsorbing and removing formaldehyde gas in air, and a good effect is obtained.

Description

technical field [0001] The invention belongs to the technical field of pollutant removal and sensing detection, and relates to the preparation of a silver-melamine nanocomposite material test paper and its formaldehyde adsorption and rapid measurement application. Background technique [0002] Formaldehyde can not only cause eye and nose inflammation, but also cause damage to human skin, respiratory tract and internal organs, anesthetize human central nervous system, and cause pulmonary edema, hepatic coma, and kidney failure. The World Health Organization confirms that formaldehyde is a teratogen, a carcinogen, and a source of allergies, and long-term exposure will cause gene mutations. Although formaldehyde is toxic, it is still widely used in industry due to its high reactivity and relatively low cost. At present, the problem of formaldehyde pollution is mainly concentrated in home decoration, textiles and food. Plywood, fiberboard, particle board and other man-made pan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 王桦刘敏冯路平陈丽君华玥陈熙
Owner QUFU NORMAL UNIV
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