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Preparation method of indicating formaldehyde adsorbent

A formaldehyde adsorption and indication technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of secondary pollution, exhaustion, and inability to indicate the life of materials, etc., and achieve the effect of low cost and simple process

Active Publication Date: 2015-06-24
安徽泽汶环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Activated carbon adsorption materials have a certain purification effect on formaldehyde, but there is a disadvantage of formaldehyde desorption under high temperature conditions; for titanium dioxide photocatalytic materials and noble metal catalysts, although their purification effects are high, they are limited by light conditions and expensive; and for For the above materials, the user cannot intuitively judge whether the life of the purification material is exhausted so as to replace it in time
[0004] Chinese invention patent ZL200710306025.4 discloses a color-developing formaldehyde adsorption material. A formaldehyde reactant is prepared by mixing a polyethylene polyamine polymer with a molecular weight of 8000 and polyethylene glycol at a certain concentration, and then adding an appropriate amount of β-naphthol to it. Indicator, finally spray the mixed solution on the surface of the folded paper filter. The reagents in this material are all organic matter, which may cause secondary pollution due to volatilization. In addition, the material only shows the reaction degree of formaldehyde, and cannot indicate the life of the material

Method used

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  • Preparation method of indicating formaldehyde adsorbent

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Experimental program
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Effect test

Embodiment 1

[0021] This embodiment provides an indicating formaldehyde adsorbent, which is prepared through the following steps:

[0022] (1) Mix magnesium hydroxide and alumina monohydrate with a molar ratio of 2:1, add attapulgite with a weight equal to 10% of the total weight of magnesium hydroxide and alumina monohydrate, and appropriate amount of water, mix well, and set aside ;

[0023] (2) Extrude the mixture of step (1) through an extruder to obtain cylindrical particles with a diameter of 0.8mm and a length of 6mm, and then dry the particles at 110°C (moisture content below 5%);

[0024] (3) Prepare a 1wt% potassium permanganate impregnation solution, and use the obtained solution to impregnate the dried particles in step (2). The impregnation temperature is normal temperature, and the impregnation time is 2 hours. The obtained particles were quickly dried (the drying temperature was 85° C.) to obtain a purple-red indicating formaldehyde adsorbent.

Embodiment 2

[0026] This embodiment provides an indicating formaldehyde adsorbent, which is prepared through the following steps:

[0027] (1) Mix magnesium hydroxide and aluminum oxide monohydrate with a molar ratio of 3:1, add bentonite with a weight of 30% of the total weight of magnesium hydroxide and aluminum oxide monohydrate, and appropriate amount of water, mix well, and set ;

[0028] (2) Extrude the mixture of step (1) through an extruder to obtain cylindrical granules with a diameter of 3mm and a length of 8mm, and then dry the granules at 110°C (moisture content below 5 %);

[0029] (3) Prepare a 3wt% sodium permanganate impregnation solution, impregnate the dried particles in step (2) with the prepared solution, impregnate for 1.5 hours, and finally use a potassium permanganate dryer to quickly dry the impregnated particles (Drying temperature is 90°C) to obtain purple-red indicating formaldehyde adsorbent.

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Abstract

The invention discloses a preparation method of an indicating formaldehyde adsorbent. The method comprises the steps that (1) magnesium hydroxide and boehmite are mixed uniformly at a molar ratio of (1-5):1; an adhesive agent with weight of 10-30% of total weight of magnesium hydroxide and boehmite, and water are added; uniform mixing is conducted for standby; (2) a mixture obtained from Step (1) is extruded and formed by a banded extruder; cylindrical particles with diameters of 0.8-3mm are obtained and then dried; and (3) the particles obtained from Step (2) are immersed in a 1wt%-3wt% permanganate aqueous solution for 1.5-3h, and dried to form the indicating formaldehyde adsorbent. The formaldehyde adsorbent prepared by the method can rapidly and efficiently remove formaldehyde with lower concentration in air, and the service life of the formaldehyde adsorbent can be indicated through variations of material colors. In addition, the technology is simple, and the cost is low.

Description

technical field [0001] The invention relates to a preparation method of a formaldehyde adsorbent. Background technique [0002] With the development of the economy, the decoration of the living room is more and more exquisite, and the problem of indoor environmental pollution is becoming more and more prominent, which is harmful to human health. Formaldehyde is the most important indoor pollutant. Long-term exposure can cause symptoms such as dizziness, headache, fatigue, and memory loss. Moreover, formaldehyde is considered to be one of the carcinogens. Long-term exposure will increase the possibility of cancer. The allowable standard for indoor formaldehyde in the "Indoor Environmental Quality Standard" is 0.1mg / m3, but the concentration of formaldehyde in the new room decoration within 5 to 10 months still exceeds this standard, and the formaldehyde in the indoor floor and furniture can be continuously released for 3 to 5 years or even For a longer period of time, it pos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/08B01J20/30B01D53/02
Inventor 胡秋婵
Owner 安徽泽汶环保科技有限公司