A Brief Review of Formaldehyde Removal through Activated Carbon Adsorption

Applied Sciences

Hyung-Kun Jo¹  Min-Hyeok Jang¹  Yu-Jin Kang¹  Joo-Il Park¹  Kyeongseok Oh²  Yukwon Jeon³  Xiaoliang Ma⁴ 

[1]Department of Chemical & Biological Engineering, Hanbat National University, Daejeon 34158, Korea

[2]Department of Chemical & Biological Engineering, Inha Technical College, Incheon 22212, Korea

[3]Department of Environmental and Energy Engineering, Yonsei University, Wonju 26493, Korea

[4]Petroleum Research Center, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat 13109, Kuwait

关键词: activated carbon;    formaldehyde removal;    amination;    surface modification;    functional groups;   

DOI  :  10.3390/app12105025

来源: DOAJ

【 摘 要 】

Formaldehyde is a highly toxic indoor pollutant that can adversely impact human health. Various technologies have been intensively evaluated to remove formaldehyde from an indoor atmospheres. Activated carbon (AC) has been used to adsorb formaldehyde from the indoor atmosphere, which has been commercially viable owing to its low operational costs. AC has a high adsorption affinity due to its high surface area. In addition, applications of AC may be diversified by the surface modification. Among the different surface modifications for AC, amination treatments of AC have been reported and evaluated. Specifically, the amine functional groups of the amine-treated AC have been found to play an important role in the adsorption of formaldehyde. Surface modifications of AC by impregnating and/or grafting the amine functional groups onto the AC surface have been reported in the literature. The impregnation of the amine-containing species on AC is mainly achieved by physical interaction or H-bond of the amines to the AC surface. Meanwhile, the grafting of the amine functional groups is mainly conducted through chemical reactions occurring between the amines and the AC surface. Herein, the carboxyl group, as a representative functional group for grafting on the surface of AC, plays a key role in the amination reactions. A qualitative comparison of amination chemicals for the surface modification of AC has also been discussed. Thermodynamics and kinetics for adsorption of formaldehyde on AC are firstly reviewed in this paper, and then the major factors affecting the adsorptive removal of formaldehyde over AC are highlighted and discussed in terms of humidity and temperature. In addition, new strategies for amination, as well as the physical modification option for AC application, are proposed and discussed in terms of safety and processability.

【 授权许可】

Unknown