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Polyacrylamidoxime 수지의 합성과 금속의 흡착에 관한 연구
A Study on Metal Adsorption with a Synthesized Polyacrylamidoxime Resin
HWAHAK KONGHAK, February 1999, 37(1), 126-132(7), NONE
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Abstract
Polyacrylonitrile을 모체로 하여 hydroxylamine에 의한 amidoxime화 반응으로 amine기와 oxime기를 함께 가지는 amidoxime형 수지로더 polyacrylamidoxime(PAO)을 합성하고, 이를 킬레이트형 흡착제로 사용하여 수용액 중의 금속이온의 흡착특성을 고찰하였다. 적외선 분석과 원소분석으로 PAO의 화학적 구조 및 조성을 확인하였으며, 반응물 농도와 반응온도의 영향을 고찰하여 PAO의 합성속도와 활성화 에너지를 결정하였다. PAO에 의한 금속의 흡착은 Langmuir모델을 따르는 화학흡착으로서 흡착온도 및 금속 수용액의 pH증가에 비례하여 증가하였고, 수종의 금속 혼합 수용액으로부터 구리의 선택적 흡착이 가능함을 확인하였다.
PAO(polyacylamidoxime) as chelating adsorbent was synthesized by the amidoximation of polyacrylonitrile with hydroxylalmine. Chemical structure and composition of PAO were identified by infrared spectra and elemental analysis, and specific surface area and density of PAO were also determined. The reaction rate of PAO synthesis and the activation energy were obtained, and the adsorption of copper, cadmium, nickel and zinc with synthesized PAO was discussed. It was found that the synthetic reaction was the first order reaction with respect to the concentrations of hydroxylamine and polyacrylonitrile, respectively. The metal adsorption with PAO was chemical adsorption obeying the Langmuir isotherm, and the amount of adsorbed metals was increased with increasing adsorption temperature and pH of metal aqueous solution. The adsorption selectivity of copper from cadmium, nickel and zinc mixed solution was comparatively high.
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