알루미늄/티타늄 산화물은 TTIP(titanium tetra-isopropoxide)와 AIP(aluminium isopropoxide)를 전구체로, 졸-겔 법을 이용하여 pH 6에서 합성했으며 합성된 알루미늄/티타늄 산화물을 흡착제로 납이온[Pb(II)]에 대한 흡착특성과 총괄흡착속도식을 결정했다. TTIP:AIP의 몰 조성비가 1:1의 조건에서 합성된 알루미늄/티타늄 산화물은 2:1, 3:1, 4:1의 몰 조성비로 합성된 경우보다 분산성이 양호했으며 흡착량도 10-20% 정도 우수했다. 또 500 ℃에서 하소된 산화물이 300 ℃와 700 ℃에서 각각 하소된 경우보다 흡착능이 우수했다. 알루미늄/티타늄 산화물을 흡착제로 사용하는 경우 공통적으로 pH 2-6 범위에서 흡착량이 급격히 증가하다가 pH 6에서 최대 흡착량을 나타냈으며 pH 6이상의 범위에서는 감소했다. Langmuir와 Freundlich흡착식의 상관계수(R²)는 각각 90.6%와 91.4%로 Freundlich식이 Langmuir식보다 높았으며 200 ml/min의 유속조건에서 미분층 반응기를 이용하여 총괄흡착속도식을 결정했다.

Aluminium/titanium oxide was synthesized by a sol-gel method at pH 6 using TTIP (titanium tetra-isopropoxide) and AIP (aluminium isopropoxide). Adsorption characteristics and overall adsorption rate of Pb(II) on synthesized oxide particles were determined in aqueous solutions. The dispersion property of aluminium/titanium oxide, whose mole ratio of TTIP:AIP was 1:1, was better than those whose mole ratios of TTIP:AIP was 2:1, 3:1, and 4:1, respectively. The adsorption amount of Pb(II) on oxide particles, of which mole ratio of TTIP:AIP was 1:1, was better by about 10-20% than those, too. The adsorptivity at calcination temperature of 500 ℃ was higher than those at 300 and 700 ℃, respectively, in oxide particles of which mole ratio of TTIP:AIP was 1:1. The adsorption amount increased rapidly from pH 2 to 6 and decreased over pH 6, where the adsorption amount was maximum at pH 6. Correlation coefficients(R²) of Langmuir and Freundlich adsorption isotherms were 90.6% and 91.4%, respectively. The overall adsorption rate was determined by a differential bed reactor at 200 ml/min.

Adsorption Aluminium/Titanium Oxide Lead Ion (II) Overall Adsorption Rate

Yang HC, Yung JS, Kang MJ, Kim JH, Kang Y, Fundamentals of Analytical Chemistry, 4th ed., Holt-Saunders, Tokyo (1982)
Zaporozhets O, Gawer O, Sukhan V, Colloids Surf. A: Physicochem. Eng. Asp., 147, 273 (1999) 
Hong SC, Hong KM, Kim MS, Chung JG, Appl. Chem., 6(1), 452 (2002)
Kim MS, Chung JG, J. Colloid Interface Sci., 232, 31 (2001)
Doroszkowski A, Lambourne R, Walton J, J. Colloid Interface Sci., 255, 896 (1997)
Kim MS, Chung JG, HWAHAK KONGHAK, 38(1), 38 (2000)
Lee SC, Chung JG, HWAHAK KONGHAK, 39(1), 48 (2001)
Baumgarten E, Dick P, J. Colloid Interface Sci., 209(1), 16 (1999) 
El Shafei GMS, Moussa NA, Philip CA, J. Colloid Interface Sci., 228(1), 105 (2000) 
Palit D, Moulik SP, J. Colloid Interface Sci., 239(1), 20 (2001) 
Samuneva B, Kozhukharov V, Trapalis C, J. Mater. Sci., 28, 2353 (1993) 
Matsuda A, Kotani Y, Kogure T, Tatsumisago M, Minami T, J. Am. Ceram. Soc., 83(1), 229 (2000)
Niesink RJ, Vries JD, Hollinger MA, Toxicology Principles and Applications, CRC Press, New York, N.Y. (1996)
Cho JH, Kwon OD, Lee JK, Korean J. Vet. Res., 36(3), 565 (1996)
Chung CH, Mun YJ, Moon CS, Yoo TJ, Choi MK, Chung YT, Korean J. Environ. Biol., 9(2), 63 (1991)
Hong SC, Kim MS, Chung JG, HWAHAK KONGHAK, 40(1), 22 (2002)
Babier F, Duc G, Petit-Ramel M, Colloids Surf., 166, 153 (2000) 
Nagata N, Kubota LT, Bueno MIMS, Peralta-Zamora PG, J. Colloid Interface Sci., 200(1), 121 (1998) 
Fahmi A, Minot C, Surf. Sci., 304, 343 (1994) 
Hong SC, Kim MS, Chung JG, J. Ind. Eng. Chem., 8(4), 305 (2002)
Winkler BF, "Kinetics Study for the Removal of Orthophosphates from Aqueous Solutions using Activated Alumina," M.S. Thesis, Northwestern University, Illinois (1969)
Cheong BS, Chung JG, J. Korean Ind. Eng. Chem., 11(6), 591 (2000)
Cookson JT, Environ. Sci. Technol., 4(2), 128 (1970) 
Hitachi Co. Ltd., Analysis Guide for Polarize Zeeman Atomic Absorption Spectrophotometry, Tokyo (1987)