改性活性炭对低浓度二氧化硫吸附动力学模型研究

doi:10.19964/j.issn.1006-4990.2021-0721

Abstract

Abstract:

Alkali-modified activated carbon is used as an efficient adsorption material for the purification of SO₂ in the clean room of semiconductor industries and data centre.However，there are few low?concentration SO₂ adsorption experiments and model studies that conform to the real building environment.The adsorption performance of three alkali?modified activated carbons，namely copper oxide?potassium hydroxide modified activated carbon，potassium hydroxide modified activated carbon and magnesium hydroxide modified activated carbon，at a temperature of 25 ℃，a relative humidity（RH） of 50% and SO₂ mass concentration of 2 612 mg/L was firstly investigated.The results showed that the adsorption capacity of the alkali?modified activated carbon samples to SO₂ was more affected by the alkali load.The experimental values of the adsorption isotherm curves of activated carbon loaded with potassium hydroxide?copper oxide were then measured at SO₂ mass concentrations ranging from 522 to 13 400 mg/L.The validity of the Langmuir model，Freundlich model and Dubin?Radushkevich（D-R） model was verified，with the Freundlich model fitting best at low concentrations（SO₂ mass concentration of 522 mg/L，error -12.18%）.The experiments on alkali?modified activated carbon at a sulphur dioxide mass concentration of 2 612 mg/L and different RH（1%，50% and 75%） showed that increased RH promoted the adsorption of sulphur dioxide on the samples surface.Analysis of the modified activated carbon by fourier transform infrared spectroscopy showed that the absorbents on the surface of the samples were —SO₃（or SO₄^2-） and —SO₂.X-ray photoelectron spectroscopy showed that the S⁶⁺ form was accounted for 80% to 90% and the proportion was increased with the increase of RH.The alkali?modified activated carbon eventually adsorbed gaseous SO₂ in the form of SO₄^2- and the adsorption process was dominated by chemical adsorption.

Key words: alkali-modified activated carbon, SO₂ adsorption, adsorption model, SO₂with low concentration

CLC Number:

O647.33

WANG Zhiqiang,ZHANG Junjie,LIU Xiangcheng,JIN Wufeng. Study on adsorption kinetics model of modified activated carbon on SO₂ with low?concentration[J]. Inorganic Chemicals Industry, 2022, 54(9): 69-76.

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References 31

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样品	主要成分质量分数/%			S_BET/ （m².g^-1）	S_micropore/ （m².g^-1）	V_{total pore}/ （cm³.g^-1）	V_micropore/ （cm³.g^-1）
样品	K₂O	CuO	MgO	S_BET/ （m².g^-1）	S_micropore/ （m².g^-1）	V_{total pore}/ （cm³.g^-1）	V_micropore/ （cm³.g^-1）
CuO-KOH@AC	16.72	25.84	—	817	779	0.413	0.349
KOH@AC	42.14	—	—	872	774	0.427	0.336
Mg（OH）₂@AC	—	—	64.94	1 124	790	0.627	0.368

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on adsorption kinetics model of modified activated carbon on SO₂ with low?concentration

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