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http://dx.doi.org/10.14478/ace.2018.1046

Thermodynamic Studies on the Adsorption of 4-Octylphenol on Carboxen by GC/MS Analysis  

Lee, Joon-Bae (Daejeon Institute, National Forensic Service)
Park, Woo-Yong (Daejeon Institute, National Forensic Service)
Shon, Shungkun (Dept. of Forensic Sci., Daejeon Health Institute of Technology)
Jung, Ji Eun (Daejeon Institute, National Forensic Service)
Jeong, Yong Ae (Daejeon Institute, National Forensic Service)
Gong, Bokyoung (Forensic Chemistry Division, National Forensic Service)
Kim, Yu-Na (Forensic Chemistry Division, National Forensic Service)
Kwon, O-Seong (Daejeon Institute, National Forensic Service)
Paeng, Ki Jung (Department of Chemistry, Yonsei University)
Publication Information
Applied Chemistry for Engineering / v.29, no.3, 2018 , pp. 356-361 More about this Journal
Abstract
It is common to analyze volatile organic compound (VOC) or semi-VOC (SVOC) in a sample composed of a complex matrix consisting of multiple components such as bloods through a separation process. Adsorption is a physical phenomenon in which certain components accumulate on the surface of other phases. In order to overcome difficulties in the pretreatment process, an adsorption is frequently used. Solid phase microextraction (SPME) equipment with porous carbon carboxen (CAR) is an example of adsorption application. In this study, the adsorption of 4-octylphenol to carboxen was examined. To do so, the extraction efficiency for such solvents as dichloromethane ($CH_2Cl_2$, DCM), ethylacetate ($CH_3COOC_2H_5$, EA) and diethylether ($C_2H_5OC_2H_5$, $Et_2O$) was studied and also the derivatization reaction for 4-octylphenol with reagents of bistrimethylsilyltrifluoroacetamide (BSTFA), methylchloroformate (MCF) and pentafluorobenzylbromide (PFBBr) was compared. The combination of DCM and BSTFA showed good performance thus they were adopted for this study. Thermodynamic adsorption experiments showed that the adsorption process was endothermic and Freundlich isotherm equation was more suitable than Langmuir isotherm. It was also found that the adsorption followed a pseudo-$2^{nd}$ order kinetic model.
Keywords
carboxen; adsorption; derivatization; gas chromatograph/mass spectrometry;
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