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Method for improving adsorption of activated carbon to low-concentration formaldehyde

A kind of activated carbon adsorption and activated carbon technology, applied in the field of air purification, can solve the problems of easy desorption, poor stability, high cost, etc., and achieve the effect of high removal rate

Inactive Publication Date: 2016-12-07
BAOHUSAN ENVIRONMENTAL PROTECTION SCI & TECH CHENGDU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gaseous aldehydes are difficult to use traditional activated carbon for physical adsorption, especially for low-concentration gases. After adsorption equilibrium, the stability is poor, easy to desorb, and susceptible to temperature changes and formaldehyde concentration changes.
2. Chemical neutralization technology. At present, various deodorants and formaldehyde capture agents developed by some companies generally use complexation technology to destroy the molecular structure of formaldehyde to achieve the purpose, but the cost is too high and has not been used in combination with decoration projects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 8g of activated carbon, soak the activated carbon with ultrasonic vibration of 10% hydrogen peroxide solution for 1.5h, filter and dry for later use; add the oxidized activated carbon to CuCl with a molar concentration of 1.5mol / L 2 and CuSO 4 Soak in the mixed solution for 9h at 36°C with ultrasonic vibration, in which CuCl 2 with CuSO 4 The molar ratio is 1:1; filtered, air-dried; in N 2 Under protection, calcined at 350°C for 2.0h to obtain primary activated carbon; 2 Under protection, the primary activated carbon was calcined at 400°C for 2 hours to obtain secondary activated carbon; 2 Under protection, the secondary activated carbon was calcined at 500 °C for 1 h.

[0036] Put the above-mentioned activated carbon in a volume of 1m with a formaldehyde concentration of 10ppm 3 In a closed device, its removal rate of formaldehyde is 93.4%.

Embodiment 2

[0038] Take 8g of activated carbon, soak the activated carbon with ultrasonic vibration of 13% hydrogen peroxide solution for 1.5h, filter and dry for later use; add the oxidized activated carbon to CuCl with a molar concentration of 2.0mol / L 2 and CuSO 4 In the mixed solution, soak for 8h at 37°C with ultrasonic vibration, in which, CuCl 2 with CuSO 4 The molar ratio is 1:1; filtered, air-dried; in N 2 Under protection, calcined at 340°C for 2.0h to obtain primary activated carbon; 2 Under protection, the primary activated carbon was calcined at 450°C for 1.5h to obtain secondary activated carbon; 2 Under protection, the secondary activated carbon was calcined at 550°C for 0.8h.

[0039] Place the above-mentioned activated carbon in a volume of 1m with a formaldehyde concentration of 10ppm 3 In a closed device, the removal rate of formaldehyde is 95.1%.

Embodiment 3

[0041] Take 8g of activated carbon, soak the activated carbon with ultrasonic vibration of 15% hydrogen peroxide solution for 1h, filter and dry for later use; add the oxidized activated carbon to CuCl with a molar concentration of 2.5mol / L 2 and CuSO 4 Soak in the mixed solution for 7h at 37°C with ultrasonic vibration, in which CuCl 2 with CuSO 4 The molar ratio is 1:1; filtered, air-dried; in N 2 Under protection, calcined at 390°C for 1.5h to obtain primary activated carbon; 2 Under protection, the primary activated carbon was calcined at 480°C for 1 h to obtain secondary activated carbon; 2 Under protection, the secondary activated carbon was calcined at 600°C for 0.5h.

[0042] Place the above-mentioned activated carbon in a volume of 1m with a formaldehyde concentration of 8ppm 3 In a closed device, the removal rate of formaldehyde is 95.6%.

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Abstract

The invention discloses a method for improving adsorption of activated carbon to low-concentration formaldehyde. The method comprises the following steps of 1 oxidizing, wherein activated carbon is soaked with a hydrogen peroxide solution with the volume concentration of 10% to 15% through ultrasonic oscillation for 1 h to 1.5 h and then filtered and dried for standby application; 2 modification treating, wherein the oxidized activated carbon is added into a CuCl2 and CuSO4 mixed solution with the molar concentration of 1.5 mol / L to 2.5 mol / L to be soaked for 7 h to 9 h at the temperature of 35 DEG C to 40 DEG C through ultrasonic oscillation, and the molar ratio of CuCl2 to CuSO4 is 1:1; 3 drying, wherein the activated carbon subjected to modification treating is filtered and naturally air-dried; 4 calcining under N2 protection, wherein the dried activated carbon is calcined for 1.5 h to 2.5 h at the temperature of 300 DEG C to 400 DEG C, calcined for 1 h to 2 h at the temperature of 400 DEG C to 500 DEG C and calcined for 0.5 h to 1 h at the temperature of 500 DEG C to 600 DEG C. The treated activated carbon has the high removal rate on formaldehyde.

Description

technical field [0001] The invention belongs to the field of air purification, in particular to a method for improving the adsorption of low-concentration formaldehyde by activated carbon. Background technique [0002] At present, there are many equipment and technologies for purifying formaldehyde in indoor air on the market, which can be roughly divided into the following two types: 1. Physical adsorption technology, which mainly uses various porous substances to remove formaldehyde through physical adsorption. The most commonly used is activated carbon, in addition to molecular sieves, bentonite, perlite, and cristobalite. Gaseous aldehydes are difficult to use traditional activated carbon for physical adsorption, especially for low-concentration gases. After adsorption equilibrium, they have poor stability, are easy to desorb, and are easily affected by temperature changes and formaldehyde concentration changes. 2. Chemical neutralization technology. At present, various...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01J20/20B01D53/02B01D2257/708
Inventor 陈生力
Owner BAOHUSAN ENVIRONMENTAL PROTECTION SCI & TECH CHENGDU
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