Effect of Polarity of Activated Carbon Surface, Solvent and Adsorbate on Adsorption of Aromatic Compounds from Liquid Phase

Chemical & Pharmaceutical Bulletin
Tatsuru GotoFumio Imazeki

Abstract

In this study, introduction of acidic functional groups onto a carbon surface and their removal were carried out through two oxidation methods and outgassing to investigate the adsorption mechanism of aromatic compounds which have different polarity (benzene and nitrobenzene). Adsorption experiments for these aromatics in aqueous solution and n-hexane solution were conducted in order to obtain the adsorption isotherms for commercial activated carbon (BAC) as a starting material, its two types of oxidized BAC samples (OXs), and their outgassed samples at 900 °C (OGs). Adsorption and desorption kinetics of nitrobenzene for the BAC, OXs and OGs in aqueous solution were also examined. The results showed that the adsorption of benzene molecules was significantly hindered by abundant acidic functional groups in aqueous solution, whereas the adsorbed amount of nitrobenzene on OXs gradually increased as the solution concentration increased, indicating that nitrobenzene can adsorb favourably on a hydrophilic surface due to its high dipole moment, in contrast to benzene. In n-hexane solution, it was difficult for benzene to adsorb on any sample owing to the high affinity between benzene and n-hexane solvent. On the other hand, adsorbed a...Continue Reading

References

Apr 29, 2008·Journal of Colloid and Interface Science·Yuichi KatoHideki Tatsumoto
Aug 13, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Benoit CoasneKeith E Gubbins
Jan 28, 2012·Journal of Colloid and Interface Science·Jiuling ChenQing Ma
Mar 27, 2012·Bioresource Technology·Daojing LiLiqiu Zhang

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Citations

Feb 20, 2019·Environmental Science and Pollution Research International·Chao XuShitao Yu
Nov 17, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Chuanhong WangMo Xian
Jun 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Diana Hernández-MonjeJuan Carlos Moreno-Piraján

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