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Preparation method of modified activated carbon for removing formaldehyde in air in high efficiency

An activated carbon and air technology, applied in chemical instruments and methods, gas treatment, membrane technology, etc., can solve the problems of low adsorption capacity of formaldehyde, short replacement cycle, easy secondary pollution, etc., and achieve low price, safe raw materials, and simple methods. Effect

Inactive Publication Date: 2017-10-24
BEIJING FORESTRY UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption of formaldehyde by ordinary activated carbon is physical adsorption, the adsorption is unstable and easy to cause secondary pollution, and the ability to adsorb formaldehyde is low, the replacement cycle is short, and the carbon consumption is large.

Method used

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  • Preparation method of modified activated carbon for removing formaldehyde in air in high efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Raw material preparation: Measure the saturated adsorption water M of coal-based activated carbon according to the following operations:

[0019] Weigh 1Kg coal-based activated carbon, add water and measure M 0 , stir evenly to achieve full adsorption, and then weigh the filtrate mass M after suction filtration 1 , subtract this mass to get the amount of water M adsorbed n , namely M n = M 0 - M 1 , repeat the measurement several times, take M n The average value of the coal-based activated carbon is the saturated adsorption water M=600g / Kg;

[0020] Use 1Kg of 5-10 mesh granular coal-based activated carbon as the base carbon, and weigh 12% of the base carbon’s mass of nitrogen-containing substances (including 80g of ammonium chloride NH 4 Cl and 40g urea CO(NH 2 ) 2 ); Take 1200g of deionized water twice the amount of saturated adsorbed water M;

[0021] (2) Loading process: Dissolve the nitrogen-containing substance in step (1) in deionized water, then ad...

Embodiment 2

[0025] (1) Raw material preparation: Measure the saturated adsorption water M of coconut shell activated carbon according to the following operations:

[0026] Weigh 1Kg of coconut shell activated carbon to be tested, add water and measure M 0 , stir evenly to achieve full adsorption, and then weigh the filtrate mass M after suction filtration 1 , subtract this mass to get the amount of water M adsorbed n , namely M n = M 0 - M 1 , repeat the measurement several times, take M n The average value promptly obtains the saturated adsorption water amount M=900g / Kg of this tested coconut shell activated carbon;

[0027] With 1kg of amorphous coconut shell activated carbon of 10-28 mesh as the base carbon, weigh 9% nitrogen-containing substances (containing 60g of ammonium bicarbonate NH 4 HCO 3 And 30g diethylamine; Get 900g of deionized water 1 times of the saturated adsorption water amount M;

[0028] (2) Loading process: Dissolve the nitrogen-containing substance in step ...

Embodiment 3

[0032] (1) Raw material preparation: measure the saturated adsorption water M of wood activated carbon according to the following operations:

[0033] Weigh 1Kg wood activated carbon to be tested, add water and measure M 0 , stir evenly to achieve full adsorption, and then weigh the filtrate mass M after suction filtration 1 , subtract this mass to get the amount of water M adsorbedn , namely M n = M 0 - M 1 , repeat the measurement several times, take M n The average value promptly obtains the saturated adsorption water amount M=500g / K of this wooden activated carbon to be tested;

[0034] Take 1 kg of 40-80 mesh powdered woody activated carbon as the base carbon, and weigh 1% of the base carbon’s mass of nitrogen-containing substances (including 5g of ammonium sulfate (NH 4 ) 2 SO 4 and 5g triethylamine); take 500g of deionized water that is 1 times the saturated adsorption water amount M;

[0035] (2) Loading process: Dissolve the nitrogen-containing substance in st...

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Abstract

The invention discloses a preparation method of modified activated carbon for removing formaldehyde in air in high efficiency. The preparation method comprises the steps of utilizing general activated carbon as base carbon, weighing nitrogen substance and deionized water, dissolving the nitrogen substance into the deionized water, then adding the base carbon, evenly mixing, standing for several hours, then performing ultrasound-assisted treatment, flatly paving the obtained base carbon, air drying the base carbon, then stoving the base carbon and naturally cooling to room temperature to obtain the modified activated carbon. The modified activated carbon for removing formaldehyde disclosed by the invention has safe raw material, low price and low cost; the method is convenient and easy to operate and can be easily expanded in industry; a method in which physical adsorption fixation and chemical reaction elimination are combined is utilized, so that a formaldehyde removing effect is obvious; furthermore, the modified activated carbon has safety, stability, no secondary pollution and convenience in use; ability for adsorbing formaldehyde in the air is larger than 90% and reaches a level of superior formaldehyde removing dedicated carbon.

Description

technical field [0001] The invention relates to a method for modifying activated carbon, in particular to a method for preparing modified activated carbon for efficiently removing formaldehyde in air. Background technique [0002] Formaldehyde is a colorless gas with a pungent odor. Formaldehyde has a stimulating effect on the skin and mucous membranes, and when it reaches a certain concentration indoors, people will feel uncomfortable. Formaldehyde concentrations greater than 0.08m³ can cause red eyes, itchy eyes, throat discomfort or pain, hoarseness, sneezing, chest tightness, asthma, dermatitis and other symptoms. Newly decorated rooms have higher levels of formaldehyde, which is the main cause of many diseases. And long-term inhalation by pregnant women may lead to fetal malformation and even death, and long-term inhalation by men can lead to sperm deformity, death, etc., and it can also cause nasal cancer. Due to the wide application of formaldehyde in the adhesive ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/22B01D53/02B01J20/30
CPCB01J20/20B01D53/02B01D2257/708B01J20/02B01J20/22
Inventor 王堃邢健雄郑凯马建峰刘杏娥杨海艳
Owner BEIJING FORESTRY UNIVERSITY
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