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Preparation method, product and application of mesoporous activated carbon with phosphorus-rich and nitrogen-rich functional groups

A technology of phosphorus-rich and nitrogen-rich functional, mesoporous activated carbon, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of secondary pollution, limited adsorption capacity, etc. Simple, optimized aldehyde removal effect

Active Publication Date: 2021-12-03
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a single activated carbon has the function of adsorbing formaldehyde, its adsorption capacity is limited, and it is easy to cause secondary pollution after the adsorption is saturated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of mesoporous activated carbon with phosphorus-rich and nitrogen-rich functional groups, the surface of the activated carbon is pretreated, the surface is treated with alkali, and the modification is realized by fixing the pore surface of the phosphorus-rich functional group and bridging the pore surface of the nitrogen-rich functional group, and is prepared according to the following steps:

[0044] 30 grams of coconut shell columnar activated carbon and mesoporous activated carbon with a diameter of 3 mm were added to 200 ml of deionized water to wash at 70°C for 6 hours, and oven-dried at 105°C / 10h.

[0045]Soak the above-mentioned pretreated activated carbon in 60ml of 0.18M potassium hydroxide solution for 4 hours, filter to remove excess solution, and dry in an oven at 105°C / 12h to obtain alkali-modified activated carbon.

[0046] The above-mentioned activated carbon after alkali treatment was impregnated in a medium volume of 0.06M phosphoric acid solution ...

Embodiment 2

[0051] A mesoporous activated carbon rich in phosphorus and nitrogen functional groups, similar to Example 1, prepared as follows:

[0052] Add 30 grams of 30-60 mesh granular coconut shell activated carbon and mesoporous activated carbon to 200ml of deionized water, wash at 80°C for 6h, and oven dry at 105°C / 10h.

[0053] Soak the above-mentioned pretreated activated carbon in 60ml of 0.3M sodium hydroxide solution for 4h, filter to remove excess solution, and dry in an oven at 105°C / 12h to obtain alkali-modified activated carbon.

[0054] The above-mentioned activated carbon after alkali treatment was immersed in a medium volume of 0.10M hypophosphorous acid solution for 8 hours, and dried in an oven at 120°C / 10 hours to obtain a modified activated carbon loaded with phosphorus functional groups.

[0055] The above-mentioned modified activated carbon loaded with phosphorus functional groups was immersed in a medium volume of 0.10M urea solution for 8h, and dried in an oven a...

Embodiment 3

[0059] A mesoporous activated carbon rich in phosphorus and nitrogen functional groups, similar to Example 1, prepared as follows:

[0060] Add 30 grams of 30-60 mesh granular coconut shell activated carbon and mesoporous activated carbon to 200ml of deionized water, wash at 80°C for 6h, and oven dry at 110°C / 10h.

[0061] Soak the above-mentioned pretreated activated carbon in 60ml of 0.36M sodium hydroxide solution for 4 hours, filter to remove excess solution, and dry in an oven at 110°C / 12h to obtain alkali-modified activated carbon.

[0062] The above-mentioned activated carbon after alkali treatment was immersed in a medium volume of 0.12M hypophosphorous acid solution for 8 hours, and dried in an oven at 110°C / 10 hours to obtain a modified activated carbon loaded with phosphorus functional groups.

[0063] The above-mentioned modified activated carbon loaded with phosphorus functional groups was immersed in a medium volume of 0.12M urea solution for 8h, and dried in an ...

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Abstract

The invention discloses a preparation process of mesoporous activated carbon with phosphorus-rich and nitrogen-rich functional groups that can efficiently remove low-concentration formaldehyde in the air at room temperature. The surface bridging of the pore surface is modified, including mesoporous activated carbon surface pretreatment, mesoporous activated carbon surface alkali treatment, pore surface immobilization of phosphorus-rich functional groups, and pore surface bridging of nitrogen-rich functional groups to obtain the desired product. The modified activated carbon prepared by the preparation process of the present invention has a formaldehyde concentration as low as 1 mg / m 3 When, the removal rate can reach 100%, and can last for a long time.

Description

technical field [0001] The invention relates to a method for modifying activated carbon, in particular to a method for preparing mesoporous activated carbon with phosphorus-rich and nitrogen-rich functional groups and its product and application. Background technique [0002] Formaldehyde (HCHO) is a common indoor and car air pollutant. Its impact on human health is mainly manifested in abnormal smell, irritation, allergy, abnormal lung function, abnormal liver function, etc. The National Occupational Safety and Health Organization has announced Formaldehyde may be carcinogenic to humans, so it has received widespread attention. [0003] The concentration of formaldehyde indoors and in cars is low, making it difficult to control. Its treatment technologies and methods mainly include reaction absorption method, photocatalytic oxidation method, ozone oxidation method, combustion method and other methods. The equipment of the reaction absorption method is relatively large and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30B01D53/02B01D53/81B01D53/72
CPCB01D53/02B01D53/72B01D53/81B01D2257/704B01J20/02B01J20/041B01J20/20B01J20/22B01J20/28083
Inventor 何丹农徐荣赵昆峰杨玲袁静蔡婷
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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