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- Title
Impacts of shell structure on nitrate-reduction activity and air stability of nanoscale zero-valent iron.
- Authors
Li, Xue; Gao, Miao; Huo, Yingchao; Liu, Houqi; Li, Jie; Huang, Tianyin; Ye, Ruquan; Li, Wenwei
- Abstract
Nanoscale zero-valent iron (nZVI) has been intensively studied for pollution control because of its high reductive activity and environmental benignity, but the poor reaction selectivity and the aging problem have limited its practical decontamination application. Here, we shed light on the impacts of nZVI shell structure on its reactivity and air stability by systematically comparing two nZVI materials with distinct iron oxide shells. The nZVI with highly crystalline and weakly hydrophilic shell exhibited ninefold higher intrinsic activity for nitrate reduction and significantly improved air stability than that with amorphous, hydrophilic iron hydroxide oxide shell. The compact-structured crystalline shell of nZVI facilitated more efficient interfacial electronic transfer for nitrate reduction and suppressed side reaction of hydrogen evolution. The protective hematite shell endowed the nZVI with significantly improved anti-aging ability, and the reducing force remained 92.6% after exposed to air for 10 days due to decreased oxygen diffusion. This work provides a better understanding of the pollutant degradation behavior of nZVI and may guide an improved synthesis and environmental application of nZVI.
- Subjects
DENITRIFICATION; FERRIC hydroxides; IRON; HYDROGEN evolution reactions; POLLUTANTS
- Publication
Environmental Science & Pollution Research, 2022, Vol 29, Issue 53, p80683
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-022-21460-y