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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AI-Extracted 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 neutralizatio...

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.

Application Domain

Gas treatmentOther chemical processes +1

Technology Topic

ChemistryUltrasonic oscillation +6

Examples

Experimental program(4)

Example Embodiment

[0034] Example 1:

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

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

Example Embodiment

[0037] Example 2:

[0038] Take 8g of activated carbon, soak the activated carbon with 13% hydrogen peroxide solution ultrasonically for 1.5 hours, 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 in ultrasonic vibration at 37°C for 8h, in which CuCl 2 With CuSO 4 The molar ratio is 1:1; filtered and air dried; in N 2 Under protection, calcine at 340℃ for 2.0h to get a primary activated carbon; 2 Under protection, the primary activated carbon is calcined at 450℃ for 1.5h to obtain secondary activated carbon; 2 Under protection, the secondary activated carbon was calcined at 550°C for 0.8h.

[0039] The activated carbon after the above treatment is placed in a volume of 1m with a formaldehyde concentration of 10ppm 3 In the closed device, its removal rate of formaldehyde is 95.1%.

Example Embodiment

[0040] Example 3:

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

[0042] The activated carbon after the above treatment is placed in a volume of 1m with a formaldehyde concentration of 8ppm 3 In the closed device, its removal rate of formaldehyde is 95.6%.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

High removal rate

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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