廢알칼리망간電池 粉末의 니켈 이온 吸着劑로서의 活用에 관한 硏究
Studies on the Application of the Spent Alkaline Manganese Batteries Powder as an Adsorbent for Nickel Ion
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초록
폐알칼리망간전지 분말에 대한 Ni2+의 흡착 거동을 살펴보기 위하여 흡착제의 양, 흡착질의 초기농도 및 반응온도를 변화시켜 가며 그 특성을 조사하였다. Ni2+의 흡착반응은 유사이차반응속도를 잘 따르는 것을 알 수 있었으며 Ni²+의 초기농도가 증가함에 따라 유사이차반응속도상수(k2)는 감소하는 것으로 나타났다. 흡착평형을 표현하는데 널리 이용되는 Langmuir와 Freundlich 흡착 모델에 평형흡착 결과를 적용하였으며 Freundlich isotherm 모델에 적합한 것으로 나타났다. 반응온도가 증가함에 따라 평형흡착량이 증가하여 흡착반응은 흡열반응의 양상을 보였으며 온도의 변화에 대한 실험결과로부터 △Ho, △Go 그리고 △So 열역학적 변수를 도출하였다.
Abstract
The adsorption features of Ni2+ onto spent alkaline manganese batteries powder have been investigated with the adsorbent dose, initial concentration of adsorbate and temperature as the experimental variables. The adsorption reaction of Ni²+ ion followed the pseudo-second order rate model, and the adsorption rate constants(k2) decreased with increasing initial concentration of nickel ion. The equilibrium adsorption data were fitted to the Langmuir and Freundlich models. The Freundlich model represents the equilibrium data better than the Langmuir model in this initial adsorbate concentration range. As the temperature increased, the adsorbed amount of nickel ion at equilibrium was also increased, which indicated that the adsorption reaction was endothermic. Based on the experimental results obtained along with temperatures, thermodynamic parameters such as △H°, △G°, and △S° were calculated.
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