Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Study on Adsorption Features of Arsenic onto Lepidocrocite

레피도크로사이트(lepidocrocite) 표면의 비소 흡착 특성 규명

  • Lee, Woo-Chun (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Jeong, Hyeon-Su (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Kim, Ju-Yong (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology(GIST)) ;
  • Kim, Soon-Oh (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
  • 이우춘 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 정현수 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 김주용 (광주과학기술원 환경공학과) ;
  • 김순오 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소)
  • Published : 2009.04.28
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Abstract

Systematic studies are performed for arsenic adsorption on synthesized lepidocrocite. The synthesized lepidocrocite with high surface area of $94.8\;g/m^2$ has shown that the point of zero charge(PZC) is 6.57 determined by potentiometric titration, suggestive of high capacity of arsenic removal. Results show that arsenite[As(III)] uptake by synthesized lepidocrocite is greater than that of arsenate[As(V)] at pH $2{\sim}12$, indicating that the lepidocrocite has high affinity toward arsenite rather than arsenate. Adsorption of arsenate decreases with increasing pH from 2 to 12, whereas arsenite sorption increases until pH 8.0, and then decreases dramatically with increasing pH, suggesting that changes in surface charge of the lepidocrocite as a function of pH playa important role in aresinc uptake by the lepidocrocite. Upon kinetic experiments, our results demonstrate that both arsenite and arsenate sorption on the lepidocrocite increases rapidly for the first 4 h followed by little changes during the duration of the experiment, showing that adsorption plays a key role in aresenic uptake by the lepidocrocite. Our results also show that power function and elovich models are the best fit for the adsorption kinetics of arsenite and aesenate on the lepidocrocite.

합성된 레피도크로사이트(lepidocrocite)에 대한 비소의 흡착특성을 규명하기 위하여 체계적인 연구를 수행하였다. 본 연구에서 합성된 레피도크로사이트는 $94.8\;g/m^2$의 큰 비표면적을 가졌으며, 전위차 적정법(potentiometric titration)에 의해 측정된 영전하점(point of zero charge, PZC)은 6.57로 나타났는데, 레피도크로사이트의 비소에 대한 높은 제거능은 이러한 특성들에 기인한 것으로 판단된다. pH $2.0{\sim}12$ 범위에서 3가(아비산염 형태) 비소가 5가(비산염 형태) 비소보다 합성된 레피도크로사이트에 대한 흡착력이 크게 나타나서 3가 비소가 5가 비소보다 레피도크로사이트에 대한 친화력이 더 크다는 것을 알 수 있었다. 5가 비소의 흡착은 pH가 2.0에서 12까지 증가하면서 지속적으로 감소한 반면, 3가 비소는 pH가 8.0까지 증가할 때까지는 흡착도 증가하다가 그 이후의 높은 pH조건에서는 흡착이 급격히 감소하는 것으로 조사되었다. 이는 pH에 따라서 레피도크로사이트의 표면전하 특성과 두 비소 종의 존재형태가 변화하기 때문인 것으로 판단된다. 흡착 반응속도에 대한 실험 결과에 의하면, 두 비소 종 모두 4시간 이내에 빠르게 흡착이 완료되는 것으로 나타났는데, 이러한 결과는 레피도크로사이트에 의한 비소의 제거는 주로 흡착반응 이라는 것을 입증한다. 이와 더불어 본 연구결과는 power function과 elovich 모델이 레피도크로사이트에 대한 두 비소 화학종의 흡착반응속도를 모사하는데 가장 적합한 것으로 조사되었다.

Keywords

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