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http://dx.doi.org/10.5322/JESI.2016.25.4.517

A Study on Enhancement of Nitrate Removal Efficiency using Surface-Modified Zero-Valent Iron Nanoparticles  

Lim, Taesook (Dept. of Environmental Engineering, Kwangwoon University)
Cho, Yunchul (Dept. of Environmental Engineering, Kwangwoon University)
Cho, Changhwan (Dept. of Environmental Engineering, Kwangwoon University)
Choi, Sangil (Dept. of Environmental Engineering, Kwangwoon University)
Publication Information
Journal of Environmental Science International / v.25, no.4, 2016 , pp. 517-524 More about this Journal
Abstract
In order to treat groundwater containing high levels of nitrate, nitrate reduction by nano sized zero-valent iron (nZVI) was studied using batch experiments. Compared to nitrate removal efficiencies at different mass ratios of $nitrate/Fe^0$, the removal efficiency at the mass ratio of 0.02% was the highest(54.59%). To enhance nitrate removal efficiency, surface modification of nZVI was performed using metallic catalysis such as Pd, Ni and Cu. Nitrate removal efficiency by Cu-nZVI (at $catalyst/Fe^0$ mass ratio of 0.1%) was 66.34%. It showed that the removal efficiency of Cu-nZVI was greater than that of the other catalysts. The observed rate constant ($k_{obs}$) of nitrate reduction by Cu-nZVI was estimated to $0.7501min^{-1}$ at the Cu/Fe mass ratio of 0.1%. On the other hand, TEM images showed that the average particle sizes of synthetic nZVI and Cu-nZVI were 40~60 and 80~100 nm, respectively. The results imply that catalyst effects may be more important than particle size effects in the enhancement of nitrate reduction by nZVI.
Keywords
Nitrate; Zero-valent iron; Nano particle; Surface modification; Metallic catalyst;
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Times Cited By KSCI : 2  (Citation Analysis)
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