경량기포콘크리트에 의한 중금속의 흡착특성

홍영호; Young Ho Hong

Journal of the Korean Industrial and Engineering Chemistry, Vol.14, No.4, 426-432, June, 2003

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경량기포콘크리트에 의한 중금속의 흡착특성

Adsorption Characteristics of Heavy Metals in Wastewater using ALC

홍영호^†

혜전대학 환경신소재계열, 홍성 350-800

Young Ho Hong^†

Department of Environment & High Technology Materials, Hyejeon College, Hongsung 350-800, Korea

E-mail:

초록

본 연구는 경량기포콘크리트를 사용하여 폐수 중에 함유되어 있는 중금속 성분을 제거하기 위한 기초 연구로 경량기포콘크리트에 의한 중금속 성분의 흡착특성에 관한 것이다. 본 연구에서는 중금속의 농도, pH 그리고 흡착제의 양의 변화가 중금속의 제거에 미치는 영향에 대하여 분석하였으며, 중금속의 농도는 원자흡광 광도계를 사용하여 측정하였다. 경량기포콘크리트를 폐수 중에 분산시켜 흡착작용에 의하여 폐수 중의 중금속 성분을 제거하는 실험을 실시한 결과 중금속 제거율은 흡착시간이 120 min이 경과한 이후부터는 구리(Cu), 코발트(Co), 니켈(Ni), 아연(Zn), 납(Pb)성분의 98%이상이 흡착 제거되는 우수한 성능을 보이고 있으며, 또한 pH가 2에서 7인 범위에서는 pH가 증가할수록 흡착율이 증가하는 경향을 보이고 있다. 각 성분 원소들의 Freundlich의 흡착등온식에서의 흡착상수 1/n가 0.049에서 0.265의 값을 지니므로 ALC는 이들 중금속을 제거하기 위한 흡착제로 우수한 효능을 보인다고 할 수 있다.

The objective of this study was to investigate the removal of heavy metals from waste water by sorption onto ALC(Autoclaved Light-weight Concrete). The influence of three parameters on the removal of heavy metals was assessed: pH, metal ion/adsorbent ratio and solution concentration. Concentration of heavy metals was determined by atomic adsorption spectrophotometry. It was found that more than 98% removal of heavy metals from an average concentration of 30 ~ 110 ppm can be accomplished within 120 min using ALC. The adsorption of heavy metals on ALC increased with increasing pH in the range of pH 2 ~ 7. A linearized Freundlich equation was used to fit the acquired experimental data. As the result, Freundlich constants, the adsorption intensity (1/n), was determined to be 0.049 ~ 0.265. From this study it was concluded that the adsorption of heavy metals by ALC was highly effective.

Keywords:ALC;heavy metal removal;freundlich isotherm

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[1] Matlock MM, Howerton BS, Atwood DA, Ind. Eng. Chem. Res., 41(6), 1579 (2002)

[2] Meyers RA, Encyclopedia of Environmental Analysis and Remediation, 2102, John Wiley & Sons, Inc. (1998)

[3] Huang JC, Wai SKM, Li AWF, Removal of Heavy Metal by Nucleated Precipitation, Proceedings of the 7th IAWQ Asia - Pacific Regional Conference - ASIAN WATERQUAL '99-Volume, 1, 427 (1999)

[4] Turkman A, Uslu O, New Developments in Industrial Wastewater Treatment, 201, Kluwer Academic Publishers (1991)

[5] Santarsiero A, Veschetti E, Donati G, Ottaviani M, Microchemical J., 59, 227 (1998)

[6] Hequet V, Ricou P, Lecuyer I, Le Cloirec P, Fuel, 80(6), 851 (2001)

[7] Park SS, J. Korean Soc. Environ. Eng., 18, 13 (1996)

[8] Brigatti MF, Franchini G, Frigieri P, Gardinali C, Medici L, Poppi L, Can. J. Chem. Eng., 77(1), 163 (1999)

[9] Bae E, Chah S, Yi JH, J. Colloid Interface Sci., 230(2), 367 (2000)

[10] Meketta JJ, Inorganic Chemicals Handbook, Dekker, U.S.A. (1993)

[11] Greenwood NN, Earnshaw A, Chemistry of the Elements, Pergamon Press (1984)

[12] Suzuki M, Adsorption Engineering, Elsevier (1990)

[13] Jeon SJ, Yu BT, Korean J. Sanitation, 10, 1 (1995)

[14] Dantas TND, Neto AAD, Moura MCP, Neto ELB, Telemaco ED, Langmuir, 17(14), 4256 (2001)

[15] McCabe WL, Smith JC, Harriot P, Unit Operation of Chemical Engineering, 5th ed., McGraw-Hill, U.S.A. (1993)