Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Adsorption characteristics of synthetic heavy metals ($Zn^{2+}$, $Ni^{2+}$, $Cd^{2+}$, $Cu^{2+}$, and $Pb^{2+}$) by bentonite

벤토나이트에 의한 혼합 중금속($Zn^{2+}$, $Ni^{2+}$, $Cd^{2+}$, $Cu^{2+}$ 및 $Pb^{2+}$) 수용액상에서의 중금속 흡착 특성

  • Shin, Woo-Seok (Institute of Marine Science and Technology Research, Hankyong National University) ;
  • Kim, Young-Kee (Department of Chemical Engineering, Hankyong National University)
  • 신우석 (한경대학교 해양과학기술연구센터) ;
  • 김영기 (한경대학교 화학공학과)
  • Received : 2014.04.02
  • Accepted : 2014.06.13
  • Published : 2014.06.30
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Abstract

In this study, the adsorption efficiency of mixed heavy metals from an aqueous solution was examined using bentonite. The physical and chemical properties of bentonite was analyzed via scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR), Further, heavy metal adsorption was characterized using Freundlich and Langmuir equations. Equilibrium adsorption data were fitted well to the Langmuir model for bentonite. The adsorption uptake of heavy metals was high and followed the order $Pb^{2+}$ > $Cu^{2+}$ > $Cd^{2+}$ > $$Zn^{2+}{\sim_=}Ni^{2+}$$. The results also showed that adsorption uptake slightly increased as increasing pH from 6 to 10. The bentonite surface was observed viay SEM and FT-IR; Si-O and Si-O-Al were found to be the main functional groups by FT-IR analysis. From these results, the adsorption mechanisms of heavy metal were not only surface adsorption and ion exchange, but also surface precipitation. Thus, bentonite could be a useful adsorbent for treating heavy metal in aqueous solution.

본 연구에서는 벤토나이트를 이용하여 수용액상에서 혼합 중금속의 흡착 특성을 평가하였다. 벤토나이트는 SEM과 FT-IR에 의해 물리 화학적 성상을 분석하였고, 중금속 흡착 특성은 Freundlich 및 Langmuir 방정식을 이용하여 해석하였다. 평형흡착 실험결과는 Langmuir 모델에 잘 부합되었으며, $Pb^{2+}$ > $Cu^{2+}$ > $Cd^{2+}$ > $$Zn^{2+}{\sim_=}Ni^{2+}$$순으로 평형 흡착량이 높았다. 용액의 pH가 6에서 10으로 증가함에 따라 흡착량은 증가하는 경향을 나타내었다. SEM과 FT-IR에 의한 벤토나이트의 표면 관찰결과에서 주 관능기는 Si-O 및 Si-O-Al 로 나타났다. 이러한 결과로부터 중금속 흡착 메카니즘은 표면흡착과 이온교환뿐만 아니라 표면 침전이다. 본 연구 결과를 통해 벤토나이트는 수용액 내 중금속을 효율적으로 제거할 수 있는 흡착제로 판단된다.

Keywords

Acknowledgement

Supported by : 한국해양과학기술진흥원

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