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Preparation technology, products and application of inorganic strong acid ammonium salt modified cocoanut active carbon for removing formaldehyde in air at normal temperature

A technology of coconut shell activated carbon and acid ammonium salt, applied in gas treatment, other chemical processes, chemical instruments and methods, etc., can solve the problems of easy deactivation of active components, high cost, secondary pollution, etc., and achieve easy industrial production , low price, the effect of removing formaldehyde

Active Publication Date: 2019-12-13
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
[0009] Although the existing activated carbon modification treatment has improved the adsorption capacity to a certain extent, the removal performance for low-concentration formaldehyde is not ideal, and the breakthrough time is not long enough

Method used

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  • Preparation technology, products and application of inorganic strong acid ammonium salt modified cocoanut active carbon for removing formaldehyde in air at normal temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take 60ml of coconut shell activated carbon and vacuum heat treatment at 125°C in an oven for 12 hours; impregnate the vacuum heat-treated coconut shell activated carbon with 60ml of 0.2mol / L hydrochloric acid solution for 12 hours, filter and remove excess acid; spread coconut shell activated carbon in an oven at 100°C Dry for 12 hours; the dried coconut shell activated carbon is impregnated with equal volume of 30% hydrogen peroxide, and dried in an oven at 90°C for 12 hours; the activated carbon after oxidation treatment is immersed in 60ml of 0.15M ammonium sulfate solution for 16 hours, and the excess salt solution is removed by filtration; finally The coconut shell activated carbon is paved and dried in an oven at 80° C. for 24 hours, and a kind of inorganic strong acid ammonium salt modified coconut shell activated carbon is obtained after cooling. The activated carbon was evaluated by the aforementioned evaluation device, the formaldehyde removal rate was 100%, a...

Embodiment 2

[0041] Take 60ml of coconut shell activated carbon and vacuum heat treatment at 150°C in an oven for 12 hours; impregnate the vacuum heat-treated coconut shell activated carbon with 60ml of 0.5mol / L hydrochloric acid solution for 12 hours, and filter to remove excess acid; spread the coconut shell activated carbon in an oven at 80°C Dry for 24 hours; the dried coconut shell activated carbon is impregnated with equal volume of 30% hydrogen peroxide, and dried in an oven at 90°C for 12 hours; the activated carbon after oxidation treatment is immersed in 60ml 0.20M ammonium nitrate solution for 16 hours, and the excess salt solution is removed by filtration; The coconut shell activated carbon is paved and dried in an oven at 60°C for 48 hours, and after cooling, an inorganic strong acid ammonium salt modified coconut shell activated carbon is obtained. The activated carbon was evaluated by the aforementioned evaluation device, the formaldehyde removal rate was 100%, and the breakt...

Embodiment 3

[0043]Take 60ml of coconut shell activated carbon and vacuum heat treatment at 125°C in an oven for 12 hours; impregnate the vacuum heat-treated coconut shell activated carbon with 60ml of 0.3mol / L hydrochloric acid solution for 12 hours, and filter to remove excess acid; spread the coconut shell activated carbon in an oven at 100°C Dry for 12 hours; impregnate the dried coconut shell activated carbon with equal volume of 30% hydrogen peroxide, and dry in an oven at 90°C for 12 hours; impregnate the oxidized activated carbon in 60ml of 0.25M ammonium sulfate solution for 16 hours, and filter to remove excess salt solution; The coconut shell activated carbon is paved and dried in an oven at 60°C for 24 hours, and a kind of inorganic strong acid ammonium salt modified coconut shell activated carbon is obtained after cooling. The activated carbon was evaluated by the aforementioned evaluation device, the formaldehyde removal rate was 100%, and the breakthrough time was 1910min. Se...

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PUM

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Abstract

The invention discloses preparation technology, products and application of inorganic strong acid ammonium salt modified cocoanut active carbon for removing formaldehyde in air at normal temperature.The method sequentially comprises the steps of vacuum pretreatment, surface hydrochloric acid treatment, drying and oxidation treatment, inorganic strong acid ammonium salt treatment and drying treatment, wherein the obtained coconut shell activate carbon is laid flat and dried for 24-48h at the temperature of 60 to 80 DEG C in a drying oven, and a needed product is obtained. The preparation technology is simple, and the removal rate of the prepared product modified coconut shell activate carbon can also reach 100% when the formaldehyde concentration is smaller than or equal to 2 mg / m < 3 > anf the effect lasting time is long.

Description

technical field [0001] The invention relates to a modification method of coconut shell activated carbon, in particular to a preparation process of coconut shell activated carbon modified with inorganic strong acid ammonium salt for removing formaldehyde in air at normal temperature, 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 more and more attention from people. [0003] The "Guidelines for Air Quality Evaluation in Passenger Cars" (GB / T 27630-2011) and "Indoor Air Quality Standards" (GB / T 18883-2002) stipulate that the maximum allowable concentration of formaldehyde is 0.1 mg / m 3 ; "Hygienic Standards for Formaldehyde in I...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/82B01D53/72
CPCB01D53/72B01D53/82B01D2253/102B01D2257/708B01J20/0259B01J20/20B01J2220/4806
Inventor 徐荣赵昆峰袁静蔡婷金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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