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Characterization of Arsenic Sorption on Manganese Slag

망간슬래그의 비소에 대한 수착특성 연구

  • Seol, Jeong Woo (Department of Earth and Environmental Sciences and Research Institute of Natural Science (RINS), Gyeongsang National University) ;
  • Kim, Seong Hee (Department of Earth and Environmental Sciences and Research Institute of Natural Science (RINS), Gyeongsang National University) ;
  • Lee, Woo Chun (Department of Earth and Environmental Sciences and Research Institute of Natural Science (RINS), Gyeongsang National University) ;
  • Cho, Hyeon Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science (RINS), Gyeongsang National University) ;
  • Kim, Soon-Oh (Department of Earth and Environmental Sciences and Research Institute of Natural Science (RINS), Gyeongsang National University)
  • 설정우 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 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 : 2013.10.29
  • Accepted : 2013.12.03
  • Published : 2013.12.31

Abstract

Arsenic contamination may be brought about by a variety of natural and anthropogenic causes. Among diverse naturally-occurring chemical speciations of arsenic, trivalent (As(III), arsenite) and pentavalent (As(V), arsenate) forms have been reported to be the most predominant ones. It has been well known that the behavior of arsenic is chiefly affected by aluminum, iron, and manganese oxides. For this reason, this study was initiated to evaluate the applicability of manganese slag (Mn-slag) containing high level of Mn, Si, and Ca as an efficient sorbent of arsenic. The main properties of Mn-slag as a sorbent were investigated and the sorption of each arsenic species onto Mn-slag was characterized from the aspects of equilibrium as well as kinetics. The specific surface area and point of zero salt effect (PZSE) of Mn-slag were measured to be $4.04m^2/g$ and 7.73, respectively. The results of equilibrium experiments conducted at pH 4, 7 and 10 suggest that the sorbed amount of As(V) was relatively higher than that of As(III), indicating the higher affinity of As(V) onto Mn-slag. As a result of combined effect of pH-dependent chemical speciations of arsenic as well as charge characteristics of Mn-slag surface, the sorption maxima were observed at pH 4 for As(V) and pH 7 for As(III). The sorption of both arsenic species reached equilibrium within 3 h and fitting of the experimental results to various kinetic models shows that the pseudo-second-order and parabolic models are most appropriate to simulate the system of this study.

비소의 오염은 다양한 자연적 또는 인위적 원인들로 인하여 발생할 수 있다. 비소의 자연상 다양한 화학종 중 3가와 5가 형태로 대부분 존재하고, 비소의 거동은 Al, Fe, Mn 산화물 등에 의해 영향을 받는다. 이에 본 연구는 Mn, Si, Ca 등의 성분이 많이 포함된 망간슬래그를 이용한 비소 수착특성을 규명하기 위해 수행되어졌다. 망간슬래그의 수착제로서의 주요한 특성을 조사하고 평형론과 반응 속도론 실험을 통해 비소 화학종별 수착양상을 고찰하였다. 망간슬래그의 비표면적은 $4.04m^2/g$, 전위차 적정법에 의해 측정된 영전하점(point of zero salt effect, PZSE)은 7.73으로 측정되었다. pH 4, 7, 10의 조건으로 두 비소 화학종의 수착반응에 대한 평형실험 결과 3가 비소보다 5가 비소가 수착량이 더 컸으며 망간슬래그와의 친화력이 더 높은 것으로 나타났다. 3가 비소는 pH 7에서, 5가 비소는 pH 4에서 수착량이 가장 높게 나타났는데 이는 pH에 따른 두 비소 화학종의 존재형태와 망간슬래그의 표면전하 간 상호작용에 기인한 것이다. 수착반응은 3가 비소와 5가 비소 모두 2시간 이내에 최대 수착량에 도달하였고, 반응속도 실험결과를 다양한 반응속도 모델들에 모사하였을 때, 유사이차(pseudo-second-order)와 포물선(parabolic) 모델이 가장 적합한 모델로 조사되었다.

Keywords

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