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2022 Vol.27, Issue 1 Preview Page
Mechanistic Study of FeS Reacted with Arsenate under Various pH Conditions

FeS 수용액 내 pH에 따른 5가비소의 반응 메커니즘 연구

Han Young-Soo1*
,
Lee Mu Yeol1
,
Seong Hye Jin2
한영수 1*
,
이무열 1
,
성혜진 2
1 Department of Environmental Engineering, Chungnam National University, Daejeon 34134 Korea
2 Research and Development Center, CITYLABS Co., Ltd, Gyeonggi-Do 13911, Korea
1 충남대학교 환경공학부
2 주식회사 시티랩스 기술연구소
*Corresponding Author
28 February 2022. pp. 25-30
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Abstract

Mackinawite (FeS), as a ubiquitous reduced iron mineral, is known as a key controller of redox reactions in anaerobic subsurface environment. The reaction of FeS with redox-sensitive toxic element such as arsenic is substantially affected by pH conditions of the given environments. In this study, the interaction of As(V) with FeS was studied under strict anaerobic conditions with various pH conditions. The pH-dependent arsenic removal tests were conducted under wide ranges of pH conditions and X-ray absorption spectroscopy (XAS) was applied to investigate the reaction mechanisms under pH 5, 7, and 9. The removal efficiency of FeS for As(V) showed the higher removal of As(V) under low pH conditions and its removal efficiency decreased with increasing pH, and no As(V) reduction was observed in 1 g/L FeS solution. However, XAS analysis indicated the reduction of As(V) to As(III) occurred during reaction between FeS and As(V). The reduced form of As(III) was particularly identified as an arsenic sulfide mineral (As 2 S 3 ) in all pH conditions (pH 5, 7, and 9). As 2 S 3 precipitation was more pronounced in pH 5 where the solubility of FeS is higher than in other pH conditions. The linear combination fitting results of XAS demonstrated that As(V) removal mechanism is concerted processes of As 2 S 3 precipitation and surface complexation of both arsenic species..

Keywords
Mackinawite
Arsenic
X-ray absorption spectroscopy
References

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Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 27
  • No :1
  • Pages :25-30
  • Received Date : 2021-12-01
  • Revised Date : 2021-12-06
  • Accepted Date : 2022-01-25
  • DOI :https://doi.org/10.7857/JSGE.2022.27.1.025
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