Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Heavy Metal Removal Capacity of Chemically Modified Alginic Acid

화학적으로 개질된 알긴산의 중금속 제거능

  • Lee, Soon-Hong (Department of Environmental Engineering, Anyang University) ;
  • Kim, Kwang-Kook (Department of Environmental Engineering, Anyang University) ;
  • Lee, Sang-Hoon (Yonsei Center for Clean Technology, Yonsei University)
  • Received : 2004.12.15
  • Accepted : 2005.07.29
  • Published : 2005.11.30
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Abstract

In this study, alginic acid that had an high affinity for a heavy metal and was noted for biological adsorbent was modified by an oxidizer, $KMnO_4$. Chemical modification changed hydroxyl of the alginic acid into carboxyl and compare with alginic acid, modified alginic acid exhibited a characteristics that carboxyl groups are comparatively high. For the use of them as an adsorbent, beads were prepared by dropping alginic acid and modified alginic acid solution in dilute 2 wt% $CaCl_2$ solution for non water soluble. The amount of removed $Cu^{2+}$ and $Pb^{2+}$ by modified alginic acid beads showed 84.7 mg and 90.9 mg per gram of beads, respectively. And it showed the amount of adsorbed heavy metal ions 10~20% higher than that of alginic acid beads in range of pH 4~7. In particular, modified alginic acid have a good adsorption capacity for $Cu^{2+}$ and $Pb^{2+}$ by Freundlich adsorption isotherm. According to this study, it is verified that alginic acid that is a nature high molecular substance improved capacity for actual application by increased heavy metal adsorption capacity by chemical modification.

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References

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