Aging characteristics and reactivity of two types of nanoscale zero-valent iron particles (Fe-BH and Fe-H2) in nitrate reduction
- Title
- Aging characteristics and reactivity of two types of nanoscale zero-valent iron particles (Fe-BH and Fe-H2) in nitrate reduction
- Author
- 박주양
- Keywords
- Nanoscale zero-valent iron; Nitrate; Core-shell structure; Aging model
- Issue Date
- 2012-07
- Publisher
- Elsevier Science SA
- Citation
- Chemical Engineering Journal, 2012, 197, P.16-23
- Abstract
- The reactivity towards nitrate and aging characteristics of two types of Fe nanoparticles (Fe-BH and Fe-H2 nanoparticles) were investigated. During shell modification for producing air-stable Fe nanoparticles, the shell layers of Fe-BH nanoparticles were passivated more extensively than those of Fe-H2 nanoparticles were. Column experiments showed that the nitrate-reduction capacity of Fe-BH nanoparticles was 35 times higher than that of Fe-H2 nanoparticles. The Fe(0) core of Fe-BH nanoparticles was consumed completely before breakthrough during the nitrate-reduction column experiments, which indicates that the thickness of Fe-BH nanoparticles' shell layers remained constant during aging. The Fe-H2 nanoparticle surfaces were readily passivated, and subsequently depassivated and reactivated by acid flushing, which indicates that the thickness of Fe-H2 nanoparticles' shell layers increased during aging. Exhausted nanoparticles were examined to obtain information on equilibrium mineral phases. Magnetite was prevalent among the mineral phases in the exhausted Fe-BH nanoparticles, unlike in the case of the Fe-H2 nanoparticles. The formation of goethite as an aging product of Fe-BH nanoparticles is reported for the first time herein. Conceptual aging models for Fe-BH and Fe-H2 nanoparticles are proposed on the basis of current and previous experimental results.
- URI
- https://www.sciencedirect.com/science/article/pii/S1385894712005906?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/73038
- ISSN
- 1385-8947; 0300-9467
- DOI
- 10.1016/j.cej.2012.05.018
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML