Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface

Luo, Jinghuan, Song, Guangyu, Liu, Jianyong, Qian, Guangren and Xu, Zhi Ping (2014) Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface. Journal of Colloid and Interface Science, 435 21-25. doi:10.1016/j.jcis.2014.08.043

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Author Luo, Jinghuan
Song, Guangyu
Liu, Jianyong
Qian, Guangren
Xu, Zhi Ping
Title Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
1095-7103
Publication date 2014-12-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.jcis.2014.08.043
Volume 435
Start page 21
End page 25
Total pages 5
Place of publication Maryland Heights, MO United States
Publisher Academic Press Inc.
Collection year 2015
Language eng
Formatted abstract
Nitrate reduction by zero-valent iron (Fe0) powder always works well only at controlled pH lower than 4 due to the formation of iron (hydr)oxides on its surface. Fe0 powder combined with activated carbon (AC), i.e., Fe0/AC micro-electrolysis system, was first introduced to enhance nitrate reduction in aqueous solution. Comparative study was carried out to investigate nitrate reduction by Fe0/AC system and Fe0 under near-neutral conditions, showing that the Fe0/AC system successfully reduced nitrate even at initial pH 6 with the reduction efficiency of up to 73%, whereas for Fe0 only ∼10%. The effect of Fe0 to AC mass ratio on nitrate reduction efficiency was examined. Easier nitrate reduction was achieved with more contact between Fe0 and AC as the result of decreasing Fe0 to AC mass ratio. Ferrous ion and oxidation–reduction potential were measured to understand the mechanism of enhanced nitrate reduction by Fe0/AC micro-electrolysis. The results suggest that a relative potential difference drives much more electrons from Fe0 to AC, thus generating adsorbed atomic hydrogen which makes it possible for nitrate to be reduced at near-neural pH. Fe0/AC micro-electrolysis thus presents a great potential for practical application in nitrate wastewater treatment without excessive pH adjustment.
Keyword Electron transfer
Fe0/AC composite
Micro electrolysis system
Nitrate reduction
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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