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Removals of Formaldehyde by Silver Nano Particles Attached on the Surface of Activated Carbon  

Shin, Seung-Kyu (Department of Civil & Environmental Engineering, Sejong University)
Kang, Jeong-Hee (Department of Civil & Environmental Engineering, Sejong University)
Song, Ji-Hyeon (Department of Civil & Environmental Engineering, Sejong University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.10, 2010 , pp. 936-941 More about this Journal
Abstract
This study was conducted to investigate formaldehyde removals by silver nano-particles attached on the surface of granular activated carbon (Ag-AC) and to compare the results to those obtained with ordinary activated carbon (AC). The BET analysis showed that the overall surface area and the fraction of micropores (less than $20{\AA}$ diameter) of the Ag-AC were significantly decreased because the silver particles blocked the small pores on the surface of the Ag-AC. The formaldehyde removal capacity of the Ag-AC determined using the Freundlich isotherm was higher than that of AC. Despite the decreased BET surface area and micropore volume, the Ag-AC had the increased removal capacity for formaldehyde, presumably due to catalytic oxidation by silver nano-particles. In contrast, the adsorption intensity of the Ag-AC, estimated by 1/n in the Freundlich isotherm equation, was similar to that of the ordinary AC, indicating that the surface modification using silver nano-particles did not affect the adsorption characteristics of AC. In a column experiment, the Ag-AC also showed a longer breakthrough time than that of the AC. Simulation results using the homogeneous surface diffusion model (HSDM) were well fitted to the breakthrough curve of formaldehyde for the ordinary AC, but the predictions showed substantial deviations from the experimental data for the Ag-AC. The discrepancy was due to the catalytic oxidation of silver nano-particles that was not incorporated in the HSDM. Consequently, a new numerical model that takes the catalytic oxidation into accounts needs to be developed to predict the combined oxidation and adsorption process more accurately.
Keywords
Formaldehyde; Silver Nano-particle; Activated Carbon; Catalytic Oxidation; Breakthrough Curve;
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Times Cited By KSCI : 4  (Citation Analysis)
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1 Lim, J. K., Lee, S. W., Kam, S. K., Lee, D. W. and Lee, M. G., "Adsorption characteristic of toluene vapor in fixedbed activated carbon," J. Environ. Sci., 14(1) 61-69(2005).   과학기술학회마을   DOI   ScienceOn
2 김한수, 박영성, 민병무 "고정 흡착층에서 벤젠의 흡착 특성," 대한환경공학회지, 23(12), 1979-1988(2001).
3 Lee, S. W., Bae, S. K., Kwon, J. H., Na, Y. S., An, C. D., Yoon, Y. S. and Song, S. K., "Correlations between pore structure of activated carbon and adsorption characteristics of acetone vapor," J. Korean Soc. Environ. Eng., 27(6), 620-625(2005).
4 Lee, S. W., Kwon, J. H., Kang, J. H., Na, Y. S., An, C. D., Yoon, Y. S. and Song, S. K., "adsorption characteristics of toluene vapor according to pore size distribution of activated carbon," J. Environ. Sci., 15(7), 695-699(2005).
5 Gosheger, G., Hardes, J., Ahrens, H., Streitburger, A., Buerger, H., Erren, M., Gunsel, A., Kemper, F. H., Winkelmann, W., and Von Eiff, C., "Silver-coated megaendoprostheses in a rabbit model - an analysis of the infection rate and toxicological side effects," Biomaterials, 25(24), 5547-5556 (2004).   DOI   ScienceOn
6 Imamura, S., Imakubo, K., Furuyoshi, S. and Jindai, H., "Decomposition of dichlorodifluoromethane on boron phosphate ($BPO_4$) catalyst," Ind. Eng. Chem. Res., 30(10), 2355-2358(1991).   DOI
7 Kim, S. S., Kang, D. H., Choi, D. H., Yeo, M. S. and Kim, K. W., "Comparison of strategies to improve indoor air quality at the pre-occupancy stage in new apartment buildings," Building Environ., 43(3), 320-328(2008).   DOI   ScienceOn
8 Jeffrey, P. O. and Lim, S. F., "Airborne Concentrations of bacteria in a hospital environment in singapore," Water Air Soil Pollution, 144(1/4), 333-341(2003).   DOI   ScienceOn
9 Thron, A., "Sick building syndrome: a diagnostic dilemma," Soc. Sci. Med., 47(9), 1307-1312(1998).   DOI   ScienceOn
10 Lee, S. C., Guo, Hai., Li, W. and Chan, L "Inter-comparison of air pollutant concentrations in different indoor environments in Hong Kong," Atmos. Environ., 36, 1929-1940 (2002).   DOI   ScienceOn
11 최원준, 정종현, "$Na_2CO_3$, $K_2CO_3$ 및 $Li_2CO_3$ 첨착활성탄을 이용한 $CO_2$제거," 한국환경보건학회지, 34(3), 240-246 (2008).   과학기술학회마을
12 임진관, 이송우, 감상규, 이동환, 이민규 "고정층 활성탄 흡착반응기에서 기상 톨루엔의 흡착특성," 한국환경과학회지, 14(1), 61-69(2005).   과학기술학회마을