Effect of Relative Humidity on Adsorption of Formaldehyde on Modified Activated Carbons

›› 2008, Vol. 16 ›› Issue (6): 871-875.

Effect of Relative Humidity on Adsorption of Formaldehyde on Modified Activated Carbons

李晶, 李忠, 刘冰, 夏启斌, 奚红霞

School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

收稿日期:2008-02-27 修回日期:2008-08-28 出版日期:2008-12-28 发布日期:2008-12-28
通讯作者: LI Zhong,E-mail:cezhli@scut.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (20576041) and the National High Technology Research and Development Program of China (2006AA06A310)

Effect of Relative Humidity on Adsorption of Formaldehyde on Modified Activated Carbons

LI Jing, LI Zhong, LIU Bing, XIA Qibin, XI Hongxia

School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Received:2008-02-27 Revised:2008-08-28 Online:2008-12-28 Published:2008-12-28
Supported by:
Supported by the National Natural Science Foundation of China (20576041) and the National High Technology Research and Development Program of China (2006AA06A310)

摘要/Abstract

摘要： This work mainly involves the study of effect of relative humidity on adsorption of formaldehyde on the activated carbons modified with organosilane solution.Modification of activated carbons was carried out by impregnating activated carbon with organosilane/methanol-containing solutions.The breakthrough curves of formaldehyde in the packed beds of original and modified activated carbons were measured,respectively,at relative humidity of 30%,60%,and 80%.Temperature-programmed desorption(TPD) experiments were used to estimate the activation energy for desorption of formaldehyde from the activated carbon.Results showed that the relative humidity had strongly influence on breakthrough curves of formaldehyde in the packed beds.The higher the relative humidity of gas mixtures through the packed beds was,the smaller the breakthrough time of formaldehyde became. The use of organosilane compounds to modify surfaces of the activated carbon can enhance the interaction between formaldehyde and the surfaces,and as a result,the breakthrough times of formaldehyde in the packed beds of the modified activated carbon were longer than that in the packed bed of the unmodified activated carbon.

关键词: activated carbon, formaldehyde, breakthrough curve, desorption activation energy

Abstract: This work mainly involves the study of effect of relative humidity on adsorption of formaldehyde on the activated carbons modified with organosilane solution.Modification of activated carbons was carried out by impregnating activated carbon with organosilane/methanol-containing solutions.The breakthrough curves of formaldehyde in the packed beds of original and modified activated carbons were measured,respectively,at relative humidity of 30%,60%,and 80%.Temperature-programmed desorption(TPD) experiments were used to estimate the activation energy for desorption of formaldehyde from the activated carbon.Results showed that the relative humidity had strongly influence on breakthrough curves of formaldehyde in the packed beds.The higher the relative humidity of gas mixtures through the packed beds was,the smaller the breakthrough time of formaldehyde became. The use of organosilane compounds to modify surfaces of the activated carbon can enhance the interaction between formaldehyde and the surfaces,and as a result,the breakthrough times of formaldehyde in the packed beds of the modified activated carbon were longer than that in the packed bed of the unmodified activated carbon.

Key words: activated carbon, formaldehyde, breakthrough curve, desorption activation energy

李晶, 李忠, 刘冰, 夏启斌, 奚红霞. Effect of Relative Humidity on Adsorption of Formaldehyde on Modified Activated Carbons[J]. , 2008, 16(6): 871-875.

LI Jing, LI Zhong, LIU Bing, XIA Qibin, XI Hongxia. Effect of Relative Humidity on Adsorption of Formaldehyde on Modified Activated Carbons[J]. , 2008, 16(6): 871-875.

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Effect of Relative Humidity on Adsorption of Formaldehyde on Modified Activated Carbons

Effect of Relative Humidity on Adsorption of Formaldehyde on Modified Activated Carbons

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