Photoelectrochemistry of Nano Zerovalent Fe Based CdFe 2 O 4 / Fe x O y Produced from Cd2+ Water Remediation
Iron nanoparticles are a new generation of materials for environmental remediation. Various metallic ions including Pb 2+ , Cr 6+ , Ni 2+ , As 3+ , As 5+ , Cd 2+ , Cu 2+ , Zn 2+ and Ba 2+ had been fixated from water using this new technology. 1 Nanoscale zero-valent iron (nZVI) had been studied as a...
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Veröffentlicht in: | Meeting abstracts (Electrochemical Society) 2015-07, Vol.MA2015-02 (43), p.1748-1748 |
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Sprache: | eng |
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Zusammenfassung: | Iron nanoparticles are a new generation of materials for environmental remediation. Various metallic ions including Pb
2+
, Cr
6+
, Ni
2+
, As
3+
, As
5+
, Cd
2+
, Cu
2+
, Zn
2+
and Ba
2+
had been fixated from water using this new technology.
1
Nanoscale zero-valent iron (nZVI) had been studied as an alternative for decontamination processes. In nZVI reaction, metallic iron is oxidized in presence of water. During this reaction, other metal ions can be removed from the aqueous media by chemical absorption.
4
In this process, iron oxides such as hematite (α-Fe
2
O
3
) are produced.
5
This α-Fe
2
O
3
have been broadly study for catalytic applications due to its highly active photochemical properties and resistance to corrosion, but the excited electrons have a short lifetime and the charge mobility is low.
6
Approaches such as doping with other metals and changing the structural arrangement of the system had been employed to overcome α-Fe
2
O
3
challenges regarding to the electron transfer processes. Previous studies from our group proves that the incorporation of cadmium (Cd) ions in the oxidized nZVI produce a changes in the structure of the system associated to iron oxides species (Fe
x
O
y
) and cadmium ferrite (CdFe
2
O
4
) formation. This can be done without using high temperatures to complete the preparation of the material, a common practice in the literature. Additional to these changes, cadmium species have been also studied for their photochemical applications. Regardless of all this information, there are few reports, which employ these particles as photocatalysts. nZVI particles were used in Cd
2+
remediation as a proof of concept for further use at the Las Cucharillas Marsh. Our group had done experiments in Cd
2+
concentrations between 1 and 6ppm. This led us to explore the effect of higher Cd
2+
concentration on the nZVI. Moreover, an alternative use of the remediation nZVI product was evaluated. This led to its possible use in photoelectrochemical cells. A challenge in this device is to optimize the quantum conversion efficiency, which is affected by the electron transfer processes in the system. We used the CdFe
2
O
4
/ Fe
x
O
y
produced from nZVI in a photoelectrochemical cell to further understand their properties. The Cd concentration employed is similar to contaminated area with this heavy metal at Las Cucharillas Marsh, Cataño, Puerto Rico. The soil in this region is mainly acidic, i.e. between pH 2 and 5. Soil analysis, using ICP fol |
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ISSN: | 2151-2043 2151-2035 |
DOI: | 10.1149/MA2015-02/43/1748 |