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Adsorption of p-Xylene by Expanded Graphite  

Lee, Chae-Young (수원대학교 토목공학과)
Jee, Hyeong-Sub (수원대학교 토목공학과)
Chung, Jae-Woo (경남과학기술대학교 환경공학과)
Kim, Sang-Hyoun (대구대학교 환경공학과)
Cho, Yun-Chul (대전대학교 환경공학과)
Kang, Seok-Tae (경희대학교 토목공학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.5, 2012 , pp. 35-40 More about this Journal
Abstract
In this study, adsorption characteristics of expanded graphite (EG) were investigated by a series of batch adsorption tests using p-Xylene as a model volatile organic compounds (VOCs). After acid treatment, graphite were expanded at various temperature from $600^{\circ}C$ to $1000^{\circ}C$ for one minute. The optimal temperature was $800^{\circ}C$, where the expansion ratio reached 195 times of original volume. The BET specific surface area of EG was $92.4m^2/g$, which was only 1/10 of granular activated carbon (GAC), however the adsorption of p-Xylene by EG was almost completed within 5 minutes while that of GAC continued for 7 days because the majority of pores of EG was consisted with meso- and macro-pores. According to the Langmuir isotherm analysis, the maximum specific adsorption of p-Xylene onto EG was 24.0 mg/L with the adsorption constant of 7.94. In conclusion, the adsorption capacity of EG was much less than that of GAC due to the significantly lower specific surface area, but the first order kinetic constant was more than 500 times larger than GAC. Overall, EG might be effective where the fast adsorption is required.
Keywords
Expanded graphite; Adsorption; p-Xylene; Activated carbon;
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1 Barbara, Z., John, C. S., Gregory, H., Alan, W. G. and William, R. P.(1996), Volatile Organic Compounds up C20 Emitted from Motor Vehicles; Measurement Methods, Atmospheric Environment, Vol. 30, No. 12, pp. 2269-2286.   DOI   ScienceOn
2 Bedient, P. B., Rifai, H. S. and Newell, C. J.(1999), Ground Water Contamination, Prentice Hall PTR, NJ, USA, 2nd Ed., pp. 6-12.
3 Celzard, A., Schneider, S. and Mareche, J. F.(2002), Densification of Expanded Graphite, Carbon, Vol. 40, No. 12, pp. 2185-2197.   DOI   ScienceOn
4 Inagaki, M. and Suwa, T.(2001), Pore Structure Analysis of Exfoliated Graphite using Image Processing of Scanning Electron Micrographs, Carbon, Vol. 39, No. 6, pp. 915-920.   DOI   ScienceOn
5 Jang, D. H., Bae, W. K., Kim, M. I., Kim, K. T (2010), Evaluation of Hybrid Thermal Oxidation(HTO) System for Removal of MEK(Methyl ethyl ketone) and Toluene, Journal of Geo-Environmental society, Vol. 11, No. 6, pp. 31-37.
6 Komilis, D. P., Ham, R. K. and Park, J. K.(2004), Emission of Volatile Organic Compounds during Composting of Municipal Solid Waste, Water Research, Vol. 38, No. 7, pp. 1707-1714.   DOI   ScienceOn
7 Lee, B.(2002), Characteristics of Exfoliated Graphite Prepared by Intercalation of Gaseous SO3 into Graphite, Bull. Korean Chem. Soc, Vol. 23, No. 12, pp. 1801-1805.   DOI   ScienceOn
8 Lee, C. Y.(2010), Treatment of Oil Contaminated Groundwater Using DAF and Fenton Oxidation Process, Journal of Geo-Environmental society, Vol. 11, No. 10, pp. 49-55.
9 Li, S., Tian, S., Feng, Y., Lei, J., Wang, P., Xiong, Y.(2010), A Comparative Investigation on Absorption Performances of Three Expanded Graphite-based Complex Materials for Toluene, Journal of Hazardous Materials, Vol. 183, No. 1-3, pp. 506-511.   DOI
10 Ministy of Environment(2002), The Management Status and Reduction Plan of Volatile Organic Compounds(VOC).
11 Nishi, Y., Iwashita, N., Sawoda, Y. and Inagaki, M.(2002), Sorption Kinetics of Heavy Oil Into Porous Carbons, Water Research, Vol. 36, No. 20, pp. 5029-5036.   DOI   ScienceOn
12 Park, S. J., Kim, K. S. (2004), A Study on Oil Adsorption of Expanded Gaphite, Korean Chem. Eng. Res. Vol. 42, No. 3, pp. 362-367.
13 Seo, M. W., Suk, H. J., Choi, D. Y., Kim, J. H.(2008), Evaluation on Efficiency of VOC Removal in Groundwater Using Diffused Aeration System, Journal of Geo-Environmental society, Vol. 9, No. 2, pp. 31-37.