Application of Zero-valent Iron Nanoparticles for Environmental Clean Up - Advanced Materials for Agriculture, Food and Environmental Safety - page 391

Contaminant
category

Contaminant removed Reaction mechanism Remarks References

Chlorinated
aliphatic,
alicyclic and
aromatic
compounds

Hexachloroethane (HCA),
Pentachloroethane (PCA), 1,1,2,2
Tetrachloroethane (1,1,2,2-TeCA),
1,1,1,2 Tetrachloroethane (1,1,1,2-
TeCA), 1,1,2-Trichloroethane
(1,1,2 TCA), 1,1,1-Trichloroethane
(1,1,1 TCA), 1,2-Dichloroethane
(1,2-DCA), 1,1-Dichloroethane
(1,1-DCA).

β -elimination, Reductive
α -elimination and
hydrogenolysis

All chlorinated ethanes except 1,2-DCA
transformed to less chlorinated ethanes
or ethenes

[135]

Polychlorinated Biphenyls (PCB) Dechlorination to biphenyl Catalyst, high temperature and aerobic

conditions favours PCB destruction

[32]

Biosolids Sorption, Precipitation,

Dechlorination,
Immobilization

Forms stable, non volatile surface complexes
with hydrogen sulphide, methyl sulphide,
degrade pesticides, sequester toxic metals.

[136]

Hexachlorocyclohaxanes ( α , β , γ and
δ isomers)

Dechlorination Removal follows γ = α > β > δ trend [39]

Atrazine Reductive dechlorination

to 2-ethyl-amino-4-
isopropylamino1,3,3-triazi
ne.

Dechlorination rate of nFe 0 7 times higher
than that of microscale Fe 0 . Fe or Al
sulfate salts, catalyst and pH inl uences
destruction rate.

[40]

AB24 Dye pH dependent adsorption

and reduction

Rate constant increases linearly with
increasing nFe 0 concentration

[45]

( Continued )