廢棄된 海藻類를 利用한 납 이온의 吸着 特性
Adsorption Features of Lead Ion on Waste Undaria pinnatifida
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수산물 처리시 폐기물로 발생하는 Undaria pinnatifida 를 Pb2+ 가 함유된 폐수의 흡착처리시 흡착제로 활용하는 방안을 검토하였다. 성분분석 결과, Undaria pinnatifida 는 주로 탄화수소화합물로 구성되어 있었으며 비표면적이 상당히 높아 흡착제로서의 잠재적 활용도가 큰 것으로 파악되었다. Undaria pinnatifida 입자의 Electrokinetic Potential 은 pH 8 부근에서 음의 최대값을 보였으며 전 pH 범위에 걸쳐 음으로 하전되어 양이온의 흡착에 적합한 것으로 검토되었다. Pb2+ 는 실험조건에서 반응개시 수 분 이내에 대부분이 흡착되었으며 평형에 도달하는 시간은 약 30 분 정도인 것으로 나타났다. 또한, Undaria pinnatifida 표면에 대한 Pb2+ 의 흡착은 Freundlich Isotherm 을 따르는 것으로 관찰되었으며 발열반응의 특성을 확인하였다. 산에 의한 흡착제의 전처리는 흡착능을 향상시켰으나 염기로 전처리할 경우에는 오히려 흡착능이 저하되었다. Undaria pinnatifida 표면에 존재하는 작용기들과 Pb2+ 와의 Organometallic Complex 형성이 Pb2+ 의 흡착에 주요하게 작용하는 것으로 파악되었으며, 경쟁적 흡착질의 존재, Ionic Strength 의 변화, 그리고 착화합물제가 수중에 공존할 경우 Pb2+ 의 흡착성이 상당한 영향을 받는 것으로 관찰되었다.
Abstract
Basic studies have been conducted regarding the attempt of the utilization of waste Undaria pinnatifida as an adsorbent forthe adsorption treatment of lead-containg wastewater. Undaria pinatifida was found to be chiefly composed of hydro-carbonaceous compounds and have a fairly high specific surface area, which suggesting the posibility of its application as apotential adsorbent. The electrokinetic potential of Undaria pinnatifida particles was observed to be negatively highest at aroundrbentespecialy for cationic adsorbates. Under the experimental conditions, Pb2+ was found to mostly adsorb onto Undaria pinnatifidawithin a few minutes and reach the equilibrium in adsorption within ca. 30 minutes. The adsorption of Pb2+ was exothermic andexplained wel by the Freundlich model. Acidic pretreatment of Undaria pinnatifida enhanced its adsorption capacity for Pb2+,however, the reverse was observed for alkaline pretreatment. The formation of organometalic complex betwen Pb2+ and somefunctional groups on the surface of Undaria pinnatifida was considered to be one of the main drives for adsorption. Finaly, the2+ was examined to be rather affected by several solution features such as the coexistence of other adsorbate,the variation of ionic strength, and the concentration of complexing agent.
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