Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Reduction of Nitrate-nigrogen by Zero-valent Iron Adhered in Mesoporous Silicas

메조기공 실리카에 부착된 영가철을 이용한 질산성 질소의 환원

  • 연경호 (한국과학기술연구원 환경기술연구단) ;
  • 이승학 (한국과학기술연구원 환경기술연구단) ;
  • 이관용 (한국과학기술연구원 환경기술연구단) ;
  • 박용민 (한국과학기술연구원 환경기술연구단) ;
  • 강상윤 (특허청 화학생명공학본부 무기화학심사팀) ;
  • 이재원 (주식회사 지오웍스) ;
  • 최용수 (한국과학기술연구원 환경기술연구단) ;
  • 이상협 (한국과학기술연구원 환경기술연구단)
  • Received : 2006.12.29
  • Accepted : 2007.01.19
  • Published : 2007.02.15
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Abstract

For environmental remediation of a contaminated groundwater plume, the use of zero-valent metal represents one of the latest innovative technologies. In this study, the effects of denitrification by zero-valent iron adsorbed in mesoporous silicas have been studied for groundwater contaminant degradation. The mesoporous silica was functionalized with 3-mercaptopropyltrimethoxysilane (MPTS) ligands and the zero-valent iron precipitated in the mesopore of granular silica was made by $FeCl_2$ and $NaBH_4$. Hydrogen was exchanged with $Fe^{2+}$ ions in the granular silicas. And then the ions were reduced by sodium borohydride in the mesoporous silicas. The surface area of the silica determined via the BET method ranged from 858 to $1275m^2/g$. The reductive reaction of nitrate-nitrogen indicated that the degradation of nitrate-nitrogen appeared to be pseudo first-order with the observed reaction rate constant kobs ($0.1619h^{-1}$) and to be directly proportional to the specific surface area. Therefore, the mesoporous silica with nano zero-valent iron proposed as a novel treatment strategy for contaminated groundwater was successfully implemented herein for the removal of nitrate-nitrogen.

Keywords

Acknowledgement

Supported by : 환경부

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