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Preparation method of weak acid ammonium salt modified activated carbon and product and application thereof

A technology of activated carbon and acid ammonium salt, which is applied in the field of preparation of weak acid ammonium salt modified activated carbon, which can solve the problems of short service life, secondary pollution, and high cost, and achieve the effects of simple preparation process, promotion of chemical adsorption, and low price

Inactive Publication Date: 2019-02-22
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Modified activated carbon based on catalytic mechanism, the active components are easy to deactivate, the service life is not long, and the cost is high;
[0007] (2) Based on physical adsorption modified activated carbon, it is easy to be saturated and cause secondary pollution;
[0008] (3) Based on acid or alkali modified chemical adsorption activated carbon, its removal rate for low concentration formaldehyde is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Add 30 grams of activated carbon to 200 ml of deionized water, wash at 50°C for 2 hours, and dry in an oven at 105°C / 6 hours.

[0058]Immerse the above-mentioned pretreated activated carbon in 60ml of 0.015M nitric acid solution for 12h, filter to remove excess acid solution, and dry in an oven at 60°C / 12h.

[0059] The above acid-treated activated carbon was soaked in 60ml of 0.03M ammonium acetate solution for 12 hours, filtered to remove excess salt solution, and oven-dried at 60°C / 12 hours to obtain weak acid ammonium salt modified activated carbon, and Example 1 was obtained. The following table lists the initial formaldehyde removal rate and service life of various activated carbons

[0060] .

Embodiment 2

[0062] Add 30 grams of activated carbon to 200 ml of deionized water, wash at 50°C for 2 hours, and dry in an oven at 105°C / 6 hours.

[0063] Immerse the above-mentioned pretreated activated carbon in 60ml of 0.03M nitric acid solution for 12h, filter to remove excess acid solution, and dry in an oven at 60°C / 12h.

[0064] The above acid-treated activated carbon was soaked in 60ml of 0.06M ammonium acetate solution for 12h, filtered to remove excess salt solution, and dried in an oven at 60°C / 12h to obtain weak acid ammonium salt modified activated carbon, and Example 2 was obtained. The following table lists the initial formaldehyde removal rate and service life of various activated carbons

[0065] .

Embodiment 3

[0067] Add 30 grams of activated carbon to 200 ml of deionized water, wash at 50°C for 2 hours, and dry in an oven at 105°C / 6 hours.

[0068] Immerse the above-mentioned pretreated activated carbon in 60ml of 0.09M nitric acid solution for 12h, filter to remove excess acid solution, and dry in an oven at 60°C / 12h;

[0069] The above acid-treated activated carbon was soaked in 60ml of 0.18M ammonium acetate solution for 12 hours, filtered to remove excess salt solution, and oven-dried at 60°C / 12 hours to obtain weak acid ammonium salt modified activated carbon, and Example 3 was obtained. The following table lists the initial formaldehyde removal rate and service life of various activated carbons

[0070] .

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PUM

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Abstract

The invention discloses a preparation method of weak acid ammonium salt modified activated carbon and a product and application thereof. The preparation method comprises the following steps: pretreating the surface of the activated carbon, adjusting pore passages and acidic functional groups, performing drying treatment, loading a formaldehyde adsorbent in the pore passages, performing drying andactivating treatment, and cooling to obtain the weak acid ammonium salt modified activated carbon. By the preparation method, the pore passages of the activated carbon move from micropores to mesopores, and the acidic groups on the surface are increased, so that effective loading of the formaldehyde adsorbent is facilitated; meanwhile, a synergistic effect is produced, and chemical adsorption of formaldehyde gas is further promoted. A pollutant formaldehyde enters the modified activated carbon, and the formaldehyde is adsorbed on the surfaces of the rich pore passages of the activated carbon first and then reacts with a large number of acidic groups and alkali groups loaded on the surfaces after treatment respectively, so that the formaldehyde in air is continuously removed, no secondary reactants are produced and the secondary pollution risk is avoided.

Description

technical field [0001] The invention relates to a method for modifying activated carbon, in particular to a method for preparing activated carbon modified by weak acid ammonium salt 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] "Guidelines for Air Quality Evaluation in Passenger Cars" (GB / T 27630-2011) and "Indoor Air Quality Standards" (GB / T 18883-2002) both stipulate that the maximum allowable concentration of formaldehyde is 0.1 mg / m 3 ; "Hygienic Standards for Formaldehyde in Indoor Air" (GB / T16127-1995) stipulates that the maximum allowable concentration of formaldehyde is 0.08 mg / m 3 . ...

Claims

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Application Information

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