Normal-temperature formaldehyde-removing modified activated carbon and preparation method thereof

A technology of activated carbon and coconut shell activated carbon, which is applied in the field of formaldehyde treatment of air pollutants, can solve the problems of not being suitable for industrial production and unsatisfactory removal of formaldehyde, and achieve long-term effective removal of formaldehyde, rapid capture, and simple preparation methods easy effect

Inactive Publication Date: 2016-05-25
北京天宫环境科技(重庆)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem that the existing formaldehyde removal technology in the air has unsatisfactory formaldehyde removal effect or is not suitable for industrial production, the present invention proposes a normal temperature formaldehyde removal modified activated carbon and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Measure 0.1mol / LCuCl 2 Solution 20mL and 0.1mol / LFeCl 3 20mL, and mixed together, the iodine value is 700mg / g, and the specific surface area is 800m 2 / g, 2g of 3mm×5mm (d*h) columnar coconut shell activated carbon with ash content <2wt%, added to the above mixed solution, mixed and soaked at a constant temperature at 20°C for 36h, passed through a drum centrifuge at a speed of 600 rpm Under the condition of min, the modified activated carbon semi-dry material was obtained after separation, the semi-dry material was dried at 70°C for 30 hours to obtain the modified activated carbon dry material, and the modified activated carbon dry material was roasted at 350°C for 5 hours in a nitrogen atmosphere. Formaldehyde removal modified activated carbon at room temperature. Put 0.1g of this modified activated carbon in a closed device with a formaldehyde content of 20ppm. It has been measured that the penetration time for formaldehyde is 1h, 2h, 3h, 4h, and 5h, and the removal...

Embodiment 2

[0033] Measure 1.6mol / LCuCl 2 Solution 50mL and 0.8mol / LFeCl 3 50mL, and mixed together, the iodine value is 1800mg / g, and the specific surface area is 2000m 2 / g, ash content <3wt%, size 3mm×5mm (d*h) columnar coconut shell activated carbon 25g, add to the above mixed solution, mix and soak at a constant temperature at 30°C for 12h, pass through a drum centrifuge at a speed of 1000 Under the condition of rpm, the modified activated carbon semi-dry material is obtained after separation, and the semi-dry material is dried at 140°C for 20 hours to obtain the modified activated carbon dry material, and the modified activated carbon dry material is roasted at 650°C under a nitrogen atmosphere for 2 hours Formaldehyde-removing modified activated carbon was obtained at room temperature, and 0.1 g of the modified activated carbon was placed in a closed device with a formaldehyde content of 20 ppm. It was measured that the penetration time for formaldehyde was 1 h, 2 h, 3 h, 4 h, and...

Embodiment 3

[0035] Measure 0.6mol / LCuCl 2 Solution 50mL and 0.4mol / LFeCl 3 50mL, and mixed together, the iodine value is 900mg / g, and the specific surface area is 1200m 2 / g, ash content<1wt%, 10g of spherical coconut shell activated carbon with a diameter of 3mm, added to the above mixed solution, mixed and soaked at a constant temperature at 25°C for 20h, passed through a drum centrifuge, at a speed of 800 rpm, After separation, the semi-dry material of modified activated carbon was obtained, and the semi-dry material was dried at 100°C for 28 hours to obtain dry modified activated carbon material, and the dry material of modified activated carbon was roasted at 420°C under nitrogen atmosphere for 4.5 hours to obtain formaldehyde removal at room temperature Modified activated carbon. Put 0.1g of this modified activated carbon in a closed device with a formaldehyde content of 20ppm. It is measured that the penetration time of formaldehyde is 1h, 2h, 3h, 4h, 5h, and the removal rate of ...

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Abstract

For solving the problem that an existing technology for removing formaldehyde in air is not ideal in formaldehyde removing effect or is not suitable for industrial production, the invention provides a normal-temperature formaldehyde-removing modified activated carbon and a preparation method thereof. The modified activated carbon is prepared by using a granular, cylindrical, spherical or honeycomb coconut shell activated carbon with large specific surface area as a carrier, using CuCl2 and FeCl3 mixed metal salt as a modified component and adopting dipping, drying and calcination processes. The modified activated carbon has the advantages of rapid capture, efficient adsorption, long working cycle and the like to gaseous formaldehyde and can meet the requirement for long-time effective formaldehyde removal in an indoor environment.

Description

technical field [0001] The invention relates to the technical field of treatment of air pollutant formaldehyde, in particular to a modified activated carbon for removing formaldehyde at normal temperature and a preparation method thereof. technical background [0002] The structural formula of formaldehyde is HCHO, which is a colorless gas with a strong pungent smell and is one of the representative pollutants of indoor air. The relative density of formaldehyde gas is 1.067, slightly heavier than air, the density of liquid (20°C) relative to water is 0.815, lighter than water, easily soluble in water, alcohol and ether, the relative molecular mass is 30.03, and the melting point is -92°C. The boiling point is -19.5°C. The aqueous solution of 30% to 40% formaldehyde is collectively called formalin, and the olfactory threshold of formaldehyde in the air is 0.06 to 1.2 mg / m 3 , the sensory threshold of the eyes is 0.01~1.9mg / m 3 . [0003] The background value of formaldehy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01J20/20B01D53/02B01D2257/70
Inventor 卢艺
Owner 北京天宫环境科技(重庆)有限公司
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