Absorbing agent for separating formaldehyde from air and preparation method thereof

An adsorbent and formaldehyde technology, which is applied in the field of adsorbents for efficient separation of formaldehyde and its preparation, can solve the problems of increased difficulty in maintenance and management, short service life, and low adsorption capacity, and achieve clean production, long service life, and adsorption The effect of large capacity

Inactive Publication Date: 2011-09-14
BEIHANG UNIV
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Problems solved by technology

Studies have shown that low-temperature catalytic oxidation can effectively oxidize formaldehyde into carbon dioxide and water. However, when formaldehyde coexists with benzene series, it is necessary to use other methods other than low-temperature catalysis to solve the problem of purification of benzene series. This will inevitably make the treatment Increased investment and operating costs of the system, increased difficulty in maintenance and management
[0005] Adsorption mainly uses porous metal oxide and non-metal oxide materials to adsorb and separate low-concentration formaldehyde in the gas phase. Due to the limited pore volume and specific surface area of ​​these adsorbent materials, the adsorption capacity is low and the service life is very short.
At the same time, when formaldehyde and benzene series coexist, it is also necessary to use other methods to solve the problem of purification treatment of benzene series, which brings problems such as complex treatment system, high investment and operation costs, and difficult maintenance and management.
[0006] Low-temperature plasma oxidation has the effect of purifying formaldehyde and benzene series. However, the energy consumption of the treatment is high, and when only relying on low-temperature plasma oxidation, harmful intermediate products will be formed due to incomplete oxidation. At the same time, if the discharge method is used Produces low-temperature plasma, which also forms harmful discharge products such as ozone and nitrogen dioxide
[0007] The photocatalytic oxidation efficiency is low, and the oxidation is not complete, and other harmful incomplete oxidation products will be generated, causing secondary pollution
In addition, when formaldehyde and benzene series coexist, not only need to use other methods to solve the problem of purification treatment of benzene series, but also benzene series may cause photocatalyst poisoning

Method used

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  • Absorbing agent for separating formaldehyde from air and preparation method thereof
  • Absorbing agent for separating formaldehyde from air and preparation method thereof
  • Absorbing agent for separating formaldehyde from air and preparation method thereof

Examples

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preparation example Construction

[0024] The present invention also provides a method for preparing an adsorbent for separating formaldehyde from air, such as figure 1 As shown, it specifically includes the following steps:

[0025] Step 1: Dissolve and clean the precursor directly with deionized water. The precursor is the red mud produced by the Bayer aluminum smelting process, and its components are silica, iron oxide, alumina, calcium oxide, sodium oxide, and antimony oxide As well as the ignition loss part, the mass ratio of the precursor to the deionized water is 1:20 to 1:10;

[0026] Step 2: Take out the cleaned precursor, place it in a drying oven, and dry it at 100-110° C. for 12-16 hours. Grinding the dried precursor to a particle size of 0.18-0.28 mm;

[0027] Step 3: Add H with a concentration ranging from 1% to 30% 2 o 2 The solution and the 0.18-0.28mm precursor are mixed according to the liquid-solid ratio of 1:5-1:10, and chemically modified on a rotary evaporator. The modification soaking...

Embodiment 1

[0032] Example 1 : The preparation number is 1~16# adsorbent, the preparation method is as follows:

[0033] Step 1: washing the precursor with deionized water, the mass ratio of the precursor to deionized water is 1:20;

[0034] Step 2: Take out the cleaned precursor, place it in a drying oven, dry it at 110° C. for 12 hours, and grind the obtained powdery precursor to a particle size of 0.18 mm;

[0035] Step 3: 100ml of different concentrations of H 2 o 2 The solution was mixed with 20g of dry and ground precursor, and modified on a rotary evaporator after mixing. 2 o 2 The concentration of the solution is shown in Table 1 respectively to obtain the modified precursor;

[0036] Step 4: Mix the modified precursor with deionized water and methylcellulose according to the weight ratio of 100:27:2.7, and press it into a tablet under different tableting pressures (as shown in Table 1) , to obtain a sheet-shaped modified precursor;

[0037] Step 5: Place the obtained flak...

Embodiment 2

[0045] Example 2 : Preparation number is 17~21# adsorbent

[0046] Step 1: washing the precursor with deionized water, the mass ratio of the precursor to deionized water is 1:20;

[0047] Step 2: Take out the cleaned precursor, place it in a drying oven, dry it at 110° C. for 12 hours, and grind the obtained powdery precursor to a particle size of 0.18 mm;

[0048] Step 3: Add 100ml H 2 o 2 The solution was mixed with 20 g of dry and ground precursors, and then modified on a rotary evaporator with a rotational speed of 60 r / min, a water bath temperature of 50°C, soaking time and H 2 o 2 The concentrations of the solutions are shown in Table 3 respectively;

[0049] Step 4: Mix the modified precursor with deionized water and methyl cellulose evenly according to the weight ratio of 100:27:2.7, and press it into a tablet under different tableting pressures (as shown in Table 3) , to obtain a sheet-shaped modified precursor;

[0050] Step 5: Place the obtained flake-shaped...

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Abstract

The invention provides an absorbing agent for separating formaldehyde from air and a preparation method thereof. The absorbing agent is obtained by taking red mud produced by the Bayer-process aluminium-smelting technique as a precursor and carrying out chemical modification and high-temperature roasting. The absorbing agent is red particles, the distribution range of internal micropore diameter of the absorbing agent is 0.9-2.7nm, and the appearance size is 0.45-0.9mm, so that the absorbing agent is beneficial to catching and removing trace formaldehyde in the air. In the absorbing agent provided by the invention, compared with the existing material for formaldehyde absorption, catalysis and purification, under a high air speed, the gas-phase low concentration formaldehyde can be absorbed in a high-efficiency manner, the absorption capacity is large, the service life is long, the used raw materials are from solid slag, namely red mud produced in the aluminium-smelting process in the aluminium industry, the source is wide, the cost is low, the prepared absorbing agent can achieve the purpose of using waste to treat harm and is beneficial to realizing clean production.

Description

technical field [0001] The invention belongs to the technical field of air purification treatment, and in particular relates to an adsorbent for efficiently separating formaldehyde from air and a preparation method thereof. Background technique [0002] Formaldehyde widely exists in the air environment, especially indoors of buildings, and airtight or semi-airtight cabins such as spacecraft, submarines, and subways. It is one of the most important air pollutants in limited space environments. The source of formaldehyde is more complex, mainly including urea-formaldehyde / phenolic resin glue wood-based panels, such as plywood, blockboard, medium density fiberboard and particle board; decorative materials containing formaldehyde, such as wallpaper, paint, adhesives, urea-formaldehyde foam insulation materials and Plastic flooring; indoor and cabin display and decoration products that emit formaldehyde, such as furniture, chemical fiber carpets and foam plastics; burning materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01D53/02
Inventor 曾小岚周俊涛朱天乐
Owner BEIHANG UNIV
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