Environmental Engineering Reference
In-Depth Information
RCl
C
2
Cl
4
Reduction
RH
Fe
0
/Ni
0
C
2
H
6
Figure 7.1
Dechlorination by zero-valent iron nanoparticles.
NO
3
−
Re d u c t i o n
Fe
0
/Pd
0
NH
4
+
NO
3
−
Re d u c t i o n
NO
2
−
Figure 7.2
Nanoremediation of nitrate by zero-valent iron nanoparticles.
Fe(II) reacts to give magnetite (Fe
3
O
4
), ferrous oxide [Fe(OH)
2
] and ferric
hydroxide [Fe(OH)
3
] depending on redox conditions and pH. For exam-
ple, chromium(VI) can be reduced by Fe(II) to the generic scheme shown
in Reaction 7.14 [50].
Cr
3+
+ 3Fe
3+
(7.14)
Cr
6+
+ 3Fe
2+
Iron nanoparticles have been used for the separation of As(III) [51].
Phosphates are a growth nutrient for microorganism in water. As a
result of increased phosphorus concentration, an excessive growth of
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