Application of Ferrate(VI) to the Removal of Humic Acid and Heavy Metals (Cu, Mn, and Zn)

Humic Acid와 중금속(Cu, Mn, Zn)제거를 위한 Ferrate(VI)의 적용

  • Lim, Mi-Hee (Division of Civil and Environmental Engineering, Korea Maritime University) ;
  • Kim, Myoung-Jin (Division of Civil and Environmental Engineering, Korea Maritime University)
  • 임미희 (한국해양대학교 토목환경공학과) ;
  • 김명진 (한국해양대학교 토목환경공학과)
  • Published : 2009.06.30

Abstract

In this paper, we have performed an experimental study to simultaneously remove humic acid (RA) and heavy metals (Cu, Mn, and Zn) from the river water using potassium ferrate(VI), a multi-purpose and environment-friendly chemical. In the experiments for treating three 0.1 mM single heavy metals using 0.03${\sim}$0.7 mM (as Fe) ferrate, the removal efficiencies ranged 28${\sim}$99% for Cu, 22${\sim}$73% for Mn, and 18${\sim}$100% for Zn. In addition, humic acid and heavy metals could be very efficiently removed at the same time using 0.03${\sim}$0.7 mM (as Fe) ferrate: for example, 49${\sim}$81% (humic acid), 93${\sim}$100% (Cu), 22${\sim}$86% (Mn), and 20${\sim}$100% (Zn). The removal efficiencies of humic acid and heavy metals in the mixture of humic acid and heavy metals were higher than that in the solution of single humic acid or heavy metal. It can be explained by the fact that, before adding ferrate to the mixed solution, part of solutes were already removed by the complexation between the negatively-charged functional groups of humic acid and heavy metal cations.

본 연구에서는 다목적으로 사용가능하고 환경친화적인 potassium ferrate를 이용하여 강물의 humic acid와 중금속(Cu, Mn, Zn)을 동시에 제거하고자 하였다. 0.03${\sim}$0.7 mM (as Fe) ferrate를 이용해서 0.1 mM 중금속을 처리한 결과, Cu에 대해 28${\sim}$99%, Mn에 대해 22${\sim}$73%, Zn에 대해18${\sim}$100%의 제거효율을 얻었다. Humic acid와 중금속의 혼합용액에 0.03${\sim}$0.7 mM (as Fe) ferrate를 주입하여 각 물질을 다음과 같이 동시에 효과적으로 제거할 수 있었다: 49${\sim}$81% (humic acid), 93${\sim}$100% (Cu), 22${\sim}$86% (Mn), 20${\sim}$100% (Zn). 혼합용액에서 humic acid와 각 중금속 제거효율이 단일 중금속과 humic acid 용액에서의 결과보다 높은데, 이는 혼합용액에 ferrate를 주입하기 전, humic acid의 음이온 작용기와 중금속 양이온의 반응에 의해 착화합물이 형성되어 일부가 제거되었기 때문이다.

Keywords

References

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