Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Characterization of Arsenic Adsorption onto Hematite

적철석(Hematite) 표면의 비소 흡착 특성

  • Kim, Seong Hee (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Lee, Woo Chun (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Cho, Hyen Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Kim, Soon-Oh (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
  • 김성희 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 이우춘 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 조현구 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 김순오 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소)
  • Received : 2012.11.20
  • Accepted : 2012.12.27
  • Published : 2012.12.31
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Abstract

Hematite has been known to be the most stable form of various iron (oxyhydr)oxides in the surface environments. In this study, its properties as an adsorbent were examined and also adsorption of arsenic onto hematite was characterized as well. The specific surface area of hematite synthesized in our laboratory appeared to be $31.8g\;m^2/g$ and its point of zero salt effect, (PZSE) determined by potentiometric titration was observed 8.5. These features of hematite may contribute to high capacity of arsenic adsorption. From several adsorption experiments undertaken at the identical solution concentrations over pH 2~12, the adsorption of As(III) (arsenite) was greater than that of As(V) (arsenate). As of pH-dependent adsorption patterns, in addition, arsenite adsorption gradually increased until pH 9.2 and then sharply decreased with pH, whereas adsorption of arsenate was greatest at pH 2.0 and steadily decreased with the increasing pH from 2 to 12. The characteristics of these pH-dependent adsorption patterns might be caused by combined effects of the variation in the chemical speciation of arsenic and the surface charge of hematite. The experimental results on adsorption kinetics show that adsorption of both arsenic species onto hematite approached equilibrium within 20 h. Additionally, the pseudo-second-order model was evaluated to be the best fit for the adsorption kinetics of arsenic onto hematite, regardless of arsenic species, and the rate constant of As(V) adsorption was investigated to be larger than that of As(III).

철 (산수)산화물들 중 지표환경에서 가장 안정된 형태로 알려진 적철석의 비소에 대한 흡착제로서의 다양한 특성을 조사하고 비소와의 흡착특성을 규명하였다. 본 연구에서 합성된 적철석은 $31.8g\;m^2/g$의 비표면적을 가졌으며, 전위차 적정법(potentiometric titration)에 의해 측정된 영전하점(point of zero salt effect, PZSE)은 8.5로 비소에 대한 높은 흡착능은 이러한 적철석의 특성들에 기인한 것으로 판단된다. 동일한 수용상 농도와 pH 2.0~12 범위에서 3가 비소와 5가 비소의 적철석에 대한 흡착량을 비교한 결과 3가 비소가 5가 비소보다 큰 흡착량을 보였다. 그리고 pH에 따른 흡착경향은 3가 비소의 경우에는 pH 9.2까지 지속적으로 흡착량이 증가하다가 그 이상의 pH에서는 흡착량이 급격하게 감소한 반면, 5가 비소는 pH 2.0에서 가장 높은 흡착량을 나타내다가 pH가 증가하면서 지속적으로 감소하는 것으로 조사되었다. 이러한 pH에 따른 흡착특성은 pH에 따라서 적철석의 표면전하 특성과 비소 화학종의 존재형태가 변화하기 때문인 것으로 판단된다. 흡착 반응속도에 대한 실험 결과에 의하면, 두 비소 종 모두 20시간 이내에 평형 흡착에 도달하는 것으로 나타났다. 그리고 비소의 화학종과 관계없이 적철석과의 흡착반응속도를 가장 잘 모사하는 반응속도 모델로는 유사이차(Pseudo-second-order) 모델로 평가되었으며, 5가 비소가 3가 비소보다 반응속도상수가 크게 나타났다.

Keywords

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