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Preparation method of aerogel composite adsorbent for efficient removal of indoor formaldehyde

A composite adsorption and aerogel technology, applied in the field of air purification, can solve the problems of limited mechanical strength of adsorption materials, unknown prospects, and large required amount of raw materials, and achieve the effects of improving adsorption performance, reducing dosage, and high specific surface area.

Inactive Publication Date: 2015-07-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main adsorption material used in this patent is activated carbon, which does not contain functional groups; in the examples of this patent, the required addition amounts of activated carbon, titanium dioxide and other materials are about 200g and 20g respectively, and the required amount of raw materials is relatively large; no support material is used , the mechanical strength of the prepared adsorption material is limited, and the prospect in practical application is unknown

Method used

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  • Preparation method of aerogel composite adsorbent for efficient removal of indoor formaldehyde
  • Preparation method of aerogel composite adsorbent for efficient removal of indoor formaldehyde
  • Preparation method of aerogel composite adsorbent for efficient removal of indoor formaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Prepare 25ml of 2mg / ml GO solution in a beaker, and put it into an ultrasonic machine for ultrasonic dispersion for 2h. Add 1 mg of carbon nano-dots to the sonicated GO solution, put it into the sonicator and sonicate for 1 h to make it fully and uniformly mixed. Add 530 μl of ethylenediamine and 100 μl of ammonia water to the mixed solution after sonication, and immerse the sponge in the solution after thorough stirring. Seal the beaker with plastic wrap and place it in a constant temperature water bath, set the temperature at 95°C, and react for 10 h. After the reaction, the excess water in the beaker was poured out and freeze-dried for 48 hours to obtain the three-dimensional sponge composite airgel G-GND / S-1. The dry formaldehyde gas is adsorbed, the breakthrough time is 5357min / g, and the adsorption capacity is 18.48mg / g.

Embodiment 2

[0046] Prepare 25ml of 2mg / ml GO solution in a beaker, and put it into an ultrasonic machine for ultrasonic dispersion for 2h. Add 5 mg of carbon nano-dots to the sonicated GO solution, put it into the sonicator and sonicate for 1 hour to make it fully and evenly mixed. Add 530 μl of ethylenediamine and 100 μl of ammonia water to the mixed solution after sonication, and immerse the sponge in the solution after thorough stirring. Seal the beaker with plastic wrap and place it in a constant temperature water bath, set the temperature at 95°C, and react for 10 h. After the reaction, the excess water in the beaker was poured out and freeze-dried for 48 hours to obtain the three-dimensional sponge composite airgel G-GND / S-5. The dry formaldehyde gas is adsorbed, the breakthrough time is 7500min / g, and the adsorption capacity is 22.81mg / g.

Embodiment 3

[0048] Prepare 25ml of 2mg / ml GO solution in a beaker, and put it into an ultrasonic machine for ultrasonic dispersion for 2h. Add 10 mg of carbon nano-dots to the sonicated GO solution, put it into the sonicator and sonicate for 1 hour to make it fully and evenly mixed. Add 530 μl of ethylenediamine and 100 μl of ammonia water to the mixed solution after sonication, and immerse the sponge in the solution after thorough stirring. Seal the beaker with plastic wrap and place it in a constant temperature water bath, set the temperature at 95°C, and react for 10 h. After the reaction, the excess water in the beaker was poured out and freeze-dried for 48 hours to obtain the three-dimensional sponge composite airgel G-GND / S-10. The dry formaldehyde gas is adsorbed, the breakthrough time is 7371min / g, and the adsorption capacity is 24.24mg / g.

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Abstract

The invention relates to a preparation method of an aerogel composite adsorbent for efficient removal of indoor formaldehyde. The method specifically includes the steps of: adding graphite oxide into an aqueous solution, and conducting uniform ultrasonic dispersion to obtain an graphene oxide aqueous solution; adding graphene carbon nanodots into the prepared graphene oxide aqueous solution, conducting uniform ultrasonic dispersion, then adding a reducing agent and ammonia water in order, and stirring the mixture fully to obtain a mixed solution; soaking a sponge into the mixed solution, performing sealing, then placing the product in constant temperature water bath to carry out water bath reaction; at the end of the water bath reaction, removing redundant solution, and carrying out freeze drying so as to obtain the adsorbent. Compared with the prior art, the preparation method provided by the invention is simple, mild, green and environment-friendly, and has no secondary pollution, the raw materials are easily available, and the prepared aerogel composite material has significantly improved formaldehyde adsorption performance uo to 22.81mg / g, and the longest penetration time is 7500min / g. Thus, the aerogel composite adsorbent has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of air purification, and relates to a preparation method of an adsorbent, in particular to a preparation method of an airgel composite adsorbent for efficiently removing indoor formaldehyde. Background technique [0002] Formaldehyde concentrations in the environment have been on the rise over the years, especially in urban indoor environments. Formaldehyde is a highly toxic substance, and it ranks second on the list of priority control of toxic chemicals in my country. Formaldehyde is defined as carcinogenic and teratogenic shape material by the World Health Organization, is the allergen of generally acknowledging, also is one of potential strong mutagen. Formaldehyde mainly enters the human body in the form of gas or ingestion, and may also enter the human body through skin absorption. It is a known strong irritant and acute poisoning gas. Indoor formaldehyde mainly enters the room through the following...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30B01J20/28B01D53/81B01D53/72
Inventor 马杰张蓝心吴立瑞庄媛陈春阳陈君红
Owner TONGJI UNIV
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