화학적 표면처리가 활성탄소의 표면 및 크롬(VI)의 흡착 속도에 미치는 영향

박수진; 김정순; 신채호; 이재락; Soo Jin Park; Jeong Soon Kim; Chae Ho Shin; Jae Rock Lee

Journal of the Korean Industrial and Engineering Chemistry, Vol.11, No.2, 190-194, April, 2000

Export Citation

화학적 표면처리가 활성탄소의 표면 및 크롬(VI)의 흡착 속도에 미치는 영향

Influence of Chemical Surface Treatments of Activated Carbons on Surface and chromium (VI) Adsorption Rate

박수진 ^†, 김정순, 신채호 ¹, 이재락

한국화학연구소 화학소재연구부, 대전 305-600
¹충북대학교 화학공학부, 청주 361-763

Soo Jin Park^†, Jeong Soon Kim, Chae Ho Shin¹, and Jae Rock Lee

Advanced Materials Div., Korea Research Institute of Chemical Technology, P.O.Box 107, Yusong, Taejon 305-600, Korea
¹School of Chemical Engineering, Chungbuk Nat'l Univ., Cheongju 361-763, Korea

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초록

본 연구에서는 활성탄소를 35 wt% HCI 산성 및 35 wt% K₂CO₃ 염기성 용액으로 1, 10, 20 시간 동안 각각 표면처리 하였으며 그에 따른 표면변화 및 크롬 (VI) 흡착속도를 관찰하였다. 활성탄소의 표면 산도는 Boehm의 선택 중화법을 이용하여 측정하였으며, 총 기공부피를 포함한 기공특성은 BET법고 Boer 식을 이용한 N₂ 기체 흡착을 통하여 알아보았다. 또한 활성탄소에 크롬(VI)의 흡착속도는 UV spectrometer를 이용하였다. 그 결과 두가지 용액으로 처리된 활성탄소 모두에서 순 흡착열 (E)와 BET 상수 C (C_BET)가 약간씩 감소하는 것을 관찰할 수 있었다. 흡착속도는 처리 시간이 길면 산도 증가의 영향으로 사료된다. 하지만 염기성 용액으로 처리된 활성탄소에서는 K₂와 K₃가 K₁ 보다 더 우수했으며, 이는 처리에 따른 활성탄소의 비표면적 또는 총 기공 부피의 증가에 의한 영향으로 사료된다.

In this work, the effect of two different chemical surface treatments in nature, i.e., 35 wt% HCI and K₂CO₃, of activated carbons on surface and Cr (VI) adsorption rate characteristics were investigated in the different reaction time conditions (1, 10 and 20 h). The acid - and base values were determined by Boehm''s titration technique. And surface properties, including total pore volume, were studied in terms of BET volumetric measurement and Boer''s t-plot equation with N₂-adsorption. Also, the Cr (VI) adsorption rate of activated carbons was measured using a UV spectrometer. As an experimental result, it was observed that the net heat of adsorption (E) or BET''s C (C_BET) slightly decreases in botyh chemical surface treatments on activated carbons. And an increase in reaciton time led to an increase of the Cr (VI) adsorption rate determined from K₁ , K₂ and K₃ constants. As compared with K₁, K₂ and K₃, it was found that K₁ constant is more effective in the case of acid treatment on activated carbons, which can be resulted from the acid value of activated carbon surfaces. However, basically treated activated carbons were more effective, evaluated on the K₂ and K₃ than on the K₁ in this chemical treatment system, probably due to effect of increasing the specific surface areas of total pore volume of activated carbons.

Keywords:activated carbon;chemical surface treatment;adsorption;chromium ion;surface properties

[References]

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Bansal RC, Donnet JB, Stoeckli F, "Active Carbon," Marcel Dekker, New York (1988)
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Boehm HP, Adv. Catal., 16, 179 (1966)
Brunauer S, Emmett PH, Teller E, J. Am. Chem. Soc., 60, 309 (1938)
de Boer JH, Lippens BC, Linsen BG, Broekhoff JCP, van den Heuvel A, Osinga TV, J. Colloid Interface Sci., 21, 405 (1966)
Park SJ, "Interfacial Forces and Field: Theory and Applications," (Ed. By J.P. Hsu), Marcel Dekker, New York (1999)
Park SJ, Kim KD, J. Colloid Interface Sci., 212(1), 186 (1999)
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Park SJ, Donnet JB, J. Colloid Interface Sci., 200(1), 46 (1998)
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Lewis JE, Plumb RC, J. Electrochem. Soc., 105, 496 (1958)
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Mahajan P, Youssef A, Walker PL, Sep. Sci. Technol., 13, 487 (1978)
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Kushiro K, Oda H, Yokokawa C, Tanso, 148, 151 (1991)

[Related Articles]

[1] Drent PJ, Woldenorp JW, Nature, 339, 431 (1989)

[2] Cusumano JA, Thomas JM, Zamaraev KI, "Perspectives in Catalysis," Blackwell, Oxford (1992)

[3] Bansal RC, Donnet JB, Stoeckli F, "Active Carbon," Marcel Dekker, New York (1988)

[4] Morenocastilla C, Riverautrilla J, Carrascomarin F, Lopezramon MV, Langmuir, 13(19), 5208 (1997)

[5] Onganer Y, Temur C, J. Colloid Interface Sci., 205(2), 241 (1998)

[6] Suzuki M, Carbon, 32, 577 (1994)

[7] Lee SM, Jung CH, Moon JK, Oh WZ, Ryu SK, HWAHAK KONGHAK, 37(1), 34 (1999)

[8] Periasamy K, Namasivayam C, Ind. Eng. Chem. Res., 33(2), 317 (1994)

[9] Periasamy K, Namasivayam C, Ind. Eng. Chem. Res., 33(2), 317 (1994)

[10] Taylor RM, Kuennen RW, Environ. Prog., 13, 65 (1994)

[11] Boehm HP, Adv. Catal., 16, 179 (1966)

[12] Brunauer S, Emmett PH, Teller E, J. Am. Chem. Soc., 60, 309 (1938)

[13] de Boer JH, Lippens BC, Linsen BG, Broekhoff JCP, van den Heuvel A, Osinga TV, J. Colloid Interface Sci., 21, 405 (1966)

[14] Park SJ, "Interfacial Forces and Field: Theory and Applications," (Ed. By J.P. Hsu), Marcel Dekker, New York (1999)

[15] Park SJ, Kim KD, J. Colloid Interface Sci., 212(1), 186 (1999)

[16] Lowell S, Shields JE, "Powder Surface Area and Porosity," Chapman & Hall, London (1993)

[17] Park SJ, Donnet JB, J. Colloid Interface Sci., 200(1), 46 (1998)

[18] Schueller GRT, Taylor SR, Hajcsar EE, J. Electrochem. Soc., 139, 2799 (1992)

[19] Lewis JE, Plumb RC, J. Electrochem. Soc., 105, 496 (1958)

[20] Keller F, Hunter MS, Robinson DL, J. Electrochem. Soc., 100, 411 (1953)

[21] Mahajan P, Youssef A, Walker PL, Sep. Sci. Technol., 13, 487 (1978)

[22] Huang CP, Wu MH, J. Water Pollut. Control Fed., 47, 2437 (1975)

[23] Kushiro K, Oda H, Yokokawa C, Tanso, 148, 151 (1991)