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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%3Dihubhttp://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
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