Korean Chemical Engineering Research, Vol.42, No.1, 70-77, February, 2004
졸-겔 법을 이용한 알루미늄/티타늄 산화물의 합성과 수용액에서 납이온(II)의 흡착특성
Synthesis of Aluminium/Titanium Oxide by a Sol-Gel Method and Adsorption Characteristics of Pb(II) in Aqueous Solutions
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초록
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.
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