Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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Adsorption of Decomposed-Granite Soils Varing with Weathering on Heavy Metals

화강풍화토의 풍화도에 따른 중금속 흡착특성

  • Kwon, Minseok (Green Technology Institute, Gyeongnam National Univ. of Science and Technology) ;
  • Lee, Myoungeun (School of Urban System Engineering, Gyeongnam National Univ. of Science and Technology) ;
  • Mok, Youngjin (Dept. of Civil Engineering, Kyung Hee Univ.) ;
  • Chung, Jaewoo (Dept. of Environmental Engineering, Gyeongnam National Univ. of Science and Technology)
  • Published : 2013.10.01
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Abstract

Effects of weathering intensity on the adsorption of heavy metals such as lead(Pb) and copper(Cu) onto decomposed granite soils were investigated by a series of batch tests. The chemical components such as $SiO_2$, $K_2O$ and $Na_2O$ having relatively high solubility were reduced and the oxidized $Fe_2O_3$ content was increased with the increase of weathering intensity. Weathering of granite soils increased the ignition loss and specific surface area, while it decreased the permeability. The lead and copper adsorptions onto the decomposed granites were enhanced with the increase of weathering intensity, mainly due to the increase of specific surface area and clayed contents. Adsorption of lead and copper onto the weathered granites could be more adequately described by the pseudo-second-order kinetic model than the pseudo-first-order model.

화강풍화토의 풍화강도에 따른 중금속 흡착특성을 규명하기 위해 납과 구리를 이용하여 회분식 흡착실험을 수행하였다. 화강풍화토의 풍화가 진행됨에 따라 용해성이 높은 $SiO_2$, $K_2O$, $Na_2O$의 함량은 감소하며, 산화물인 $Fe_2O_3$의 함량은 증가하는 것으로 나타났으며, 강열감량과 비표면적은 증가하고 투수계수는 감소하는 것으로 나타났다. 화강풍화토의 풍화강도가 증가할수록 비표면적과 점토질 성분이 증가하므로 납과 구리의 흡착량이 증가하는 것으로 나타났다. 화강풍화토에 의한 납과 구리의 흡착속도는 1차 반응속도모델보다 2차 반응속도모델에 의해 적절하게 설명될 수 있는 것으로 나타났다.

Keywords

References

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