化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (4) : 259-263. DOI: 10.19817/j.cnki.issn1006-3536.2023.04.046

开发与应用

改性活性炭对SO₂和NO_x的吸附性能研究

杨森, 杨欢, 赵耀辉, 徐淑权, 周松山

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Study on the adsorption performance of modified activated carbon for SO₂ and NO_x

Yang Sen, Yang Huan, Zhao Yaohui, Xu Shuquan, Zhou Songshan

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文章历史 +

Received		Published
2021-12-27		2023-04-20
Issue Date	Revised Date
2023-04-27	2021-12-27

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摘要

分别采用Cu(NO₃)₂、H₂O₂和KMnO₄对椰壳活性炭进行改性,研究了活性炭微观结构、表面化学性质变化,及其对SO₂、NO_x等酸性腐蚀性气氛的吸附性能。结果表明,Cu(NO₃)₂改性活性炭比表面积显著降低,平均孔径有所下降,Cu(NO₃)₂微晶分布于活性炭表面及微观孔道内,表面以碳、铜、氧和氮元素为主。H₂O₂改性活性炭比表面积有所增加,平均孔径减小,H₂O₂与活性炭表层反应后起到刻蚀效应,引入丰富的微纳孔道结构,使其表面含氧官能团增加,氧元素含量提升。KMnO₄改性活性炭比表面积和平均孔径略微降低,KMnO₄与活性炭表层反应后含氧官能团增加,反应产物附着于活性炭表面,改变其微观结构。三种方式改性的活性炭对SO₂和NO_x吸附性能均显著提升,在给定浓度下,Cu(NO₃)₂改性活性炭吸附性能最优,对SO₂、NO₂和NO的吸附容量分别达到168.30、203.57和124.56mg/g。

Abstract

Coconut shell activated carbon was modified by Cu(NO₃)₂,H₂O₂ and KMnO₄,respectively.The microstructure,surface chemical property of modified activated carbon,and its adsorption performance for SO₂,NO_x and other acidic corrosive atmospheres were investigated.The results showed that the specific surface area of activated carbon modified by Cu(NO₃)₂ decreased significantly and the average pore diameter decreased slightly.Cu(NO₃)₂ microcrystals were distributed on the surface of activated carbon and in the microscopic pore channels,and carbon,copper,oxygen and nitrogen were predominant element on the surface.The specific surface area of activated carbon modified by H₂O₂ increased slightly,however,average pore diameter decreased.The surface of activated carbon was seriously etched after the reaction with H₂O₂,introducing rich micro-nano-pore structure to increase the oxygen functional groups on the surface and promote the content of oxygen element.The specific surface area and average pore diameter of activated carbon modified by KMnO₄ decreased slightly,and the oxygen functional groups increased after the reaction between the surface layer of activated carbon and KMnO₄.Meanwhile,the reaction products adhered to the surface of activated carbon and changed its microstructure.The adsorption performance of activated carbons modified by Cu(NO₃)₂,H₂O₂ and KMnO₄ for on SO₂,NO₂ and NO were significantly improved.The adsorption performance of activated carbon modified by Cu(NO₃)₂ was the optimal under the given concentration,and the adsorption capacity for SO₂,NO₂ and NO reached 168.30mg/g,203.57mg/g and 124.56mg/g,respectively.

关键词

改性活性炭 / 吸附 / 腐蚀气氛 / 含氧官能团

Key words

modified activated carbon / adsorption / corrosive gas / oxygen functional groups

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改性活性炭对SO₂和NO_x的吸附性能研究[J]. 化工新型材料, 2023, 51(4): 259-263 DOI:10.19817/j.cnki.issn1006-3536.2023.04.046

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