Preparation method for formaldehyde adsorbent
A formaldehyde adsorption and molecular sieve technology, which is applied in the field of air purification, can solve the problems of small adsorption capacity of polar substances, failure of indoor air purification requirements, and ineffective formaldehyde adsorption effect, etc., and achieves the improvement of formaldehyde adsorption rate and adsorption rate, and saturated adsorption capacity Large, thorough adsorption effect
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Embodiment 1
[0018] Mix 10g MOR molecular sieve with 20g manganese sulfate aqueous solution with a mass concentration of 5% evenly, place in a muffle furnace at 550°C for 2 hours, and cool naturally to room temperature to obtain MnO 2 -MOR. Then the above-prepared MnO 2 -MOR was placed in a 0.5M copper nitrate solution for ion exchange at room temperature for 2 hours to obtain a formaldehyde adsorbent.
[0019] Put the obtained formaldehyde adsorbent into the sample tube, shake it lightly, fill it until the thickness of the sample is 7cm, and control the concentration of formaldehyde to 0.8-1.2mg / m 3 , set the flow rate to 1.00L / min, and measure the saturated adsorption capacity of the formaldehyde adsorbent by the dynamic adsorption method. Add formaldehyde solution into a 1 liter vacuum box to control the formaldehyde concentration to 0.5mg / m 3 , add formaldehyde adsorbent, let it stand for 24h, and measure the formaldehyde removal rate of formaldehyde adsorbent by static adsorption m...
Embodiment 2
[0023] Mix 5g of MOR molecular sieve with 25g of manganese sulfate aqueous solution with a mass concentration of 8% evenly, place in a muffle furnace at 550°C for 2 hours, and cool naturally to room temperature to obtain MnO 2 -MOR. Then the above-prepared MnO 2 -MOR was placed in a 1M copper nitrate solution for ion exchange at room temperature for 2 hours to obtain a formaldehyde adsorbent.
[0024] The MOR molecular sieve preparation method is as follows: with SiO 2 、Al 2 o 3 , NaOH, H 2 O is the raw material, in parts by mole, SiO 2 for 18 parts, Al 2 o 3 is 1 part, NaOH is 18 parts, H 2 O is 225 parts; the above raw materials are put into a stirrer and stirred and mixed into a colloidal state, then continue to stir and age at room temperature for 10 hours, and then crystallize and react for 10 hours at a temperature of 170~180°C to obtain a reaction product; The reaction product was washed with water until the pH value was neutral, and then suction-filtered to o...
Embodiment 3
[0027] Mix 2g MOR molecular sieve with 16g manganese sulfate aqueous solution with a mass concentration of 10% evenly, place in a muffle furnace at 550°C for 2 hours, and cool naturally to room temperature to obtain MnO 2 -MOR. Then the above-prepared MnO 2 -MOR was placed in a 2M copper nitrate solution for ion exchange at room temperature for 2 hours to obtain a formaldehyde adsorbent.
[0028] The MOR molecular sieve preparation method is as follows: with SiO 2 、Al 2 o 3 , NaOH, H 2 O is the raw material, in parts by mole, SiO 2 for 15 parts, Al 2 o 3 is 1 part, NaOH is 10 parts, H 2 O is 100 parts; put the above raw materials into a stirrer and mix them into a colloid, then continue to stir and age at room temperature for 6 hours, and then crystallize and react for 15 hours at a temperature of 175°C to obtain a reaction product; the reaction product Wash with water until the pH value is neutral, and then filter with suction to obtain a solid product. The solid pr...
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