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

摘要/Abstract

摘要：

碱改性活性炭是一种广泛应用于半导体工业和数据中心净化室内吸附二氧化硫的高效材料，但是鲜有针对符合真实建筑环境的低浓度二氧化硫吸附实验及动力学模型进行研究。首先研究了氧化铜-氢氧化钾改性活性炭（CuO-KOH@AC）、氢氧化钾改性活性炭（KOH@AC）、氢氧化镁改性活性炭[Mg（OH）₂@AC]等3种碱改性活性炭在温度为25 ℃、相对湿度（RH）为50%、二氧化硫质量浓度为2 612 mg/L条件下对二氧化硫的吸附性能，结果显示碱改性活性炭对二氧化硫的吸附能力受碱负荷量的影响更多。然后测定了CuO-KOH@AC在二氧化硫质量浓度为522~13 400 mg/L的吸附等温曲线实验值，验证了Langmuir模型、Freundlich模型、Dubin-Radushkevich（D-R）模型的有效性，其中Freundlich模型在低二氧化硫浓度条件（二氧化硫质量浓度为522 mg/L，误差为-12.18%）下拟合效果最好。CuO-KOH@AC在二氧化硫质量浓度为2 612 mg/L、不同RH（1%、50%、75%）条件下的吸附实验表明，RH增加能够促进二氧化硫在吸附剂表面的吸附。傅里叶变换红外光谱对CuO-KOH@AC吸附二氧化硫后的分析表明，吸附剂表面的吸附物种为—SO₃（或SO₄^2-）和—SO₂。X射线光电子能谱对CuO-KOH@AC吸附二氧化硫后的分析结果显示，吸附剂表面S⁶⁺形态占80%~90%，其比例随着RH的增加而增加。CuO-KOH@AC最终以SO₄^2-形式吸附气态二氧化硫，吸附过程以化学吸附为主。

关键词: 碱改性活性炭, 二氧化硫吸收, 吸附模型, 低浓度二氧化硫

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

中图分类号:

O647.33

王志强,张俊杰,刘相成,金梧凤. 改性活性炭对低浓度二氧化硫吸附动力学模型研究[J]. 无机盐工业, 2022, 54(9): 69-76.

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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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

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