A Study on Transport Characteristics of CMC-modified Zero Valent Iron (ZVI) Nanoparticles in Porous Media

다공성 매질내에서 CMC로 표면개질된 영가철 나노입자의 이동 특성에 관한 연구

  • Cho, Yun-Chul (Department of Environmental Engineering, Kwangwoon University) ;
  • Choi, Sang-Il (Department of Environmental Engineering, Kwangwoon University)
  • 조윤철 (광운대학교 환경공학과) ;
  • 최상일 (광운대학교 환경공학과)
  • Received : 2009.12.03
  • Accepted : 2009.12.28
  • Published : 2009.12.31

Abstract

Carboxymethyl cellulose (CMC) as stabilizer is expected to facilitate in-situ delivery of zero-valent iron (ZVI) nanoparticles in a contaminated aquifer because it increases dispersity of ZVI nanoparticles. This work investigated the transport of CMC-stabilized ZVI nanoparticles (CMC-Fe) using column breakthrough experiments. The ZVI nanoparticles (100 mg/L Fe) were transportable through sand porous media. In contrast, non-stabilized ZVI nanoparticles rapidly agglomerate in solution and are stopped in sand porous media. At pH 7 of solution approximately 80% CMC-Fe were eluted. When the pH of solution is below 5, 100% CMC-Fe were eluted. These results suggest that the mobility of CMCFe was increased as pH decreases. In the mobility test under different ionic strengths using $Na^+$ and $Ca^{2+}$ ions, there was no signigficant difference in the mobility of CMC-Fe. Also, in the experiments of effect of clay and natural organic mater (NOM) on the mobility of ZVI, there was no significant difference in the mobility of CMC-Fe not only between 1 and 5% clay, but 100 and 1000 mg/L NOM. The results from this work suggests that the CMC-Fe nanoparticles could be easily delivered into the subsurface over a broad range of ionic strength, clay and NOM.

Acknowledgement

Supported by : 환경부

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