Environmental Engineering Reference
In-Depth Information
table 0.
oeriew of treatment technologies based on nanotechnology
deelopment
status (00)
nanomaterial
description
Compounds treated
Ref.
Free nanoparticles
Treatment by degradation
Nanoscale.zero-valent.iron.
(nZVI)
Slurry.of.nZVI.injected.into.groundwater..Reduces.
some.compounds.(e.g.,.chlorinated.solvents);.promotes.
oxidation.of.others.when.oxygen.is.present.in.the.
aquifer.
Groundwater.treatment:.reduction.of.
chlorinated.ethylenes.(trichloroethylene.
[TCE],.tetrachloroethylene.[PCE]),.
chlorinated.ethanes,.and.PCBs..
Oxidation.of.certain.pesticides,.phenol..
Can.adsorb.As(III).and.treat.As(V).by.
reduction.and.adsorption.
Full-scale.
(groundwater.
treatment)
[3-5]
[6-8]
[21]
[29-40]
nZVI.has.been.proposed.as.an.amendment.to.sewage.
sludge.(at.<.0.1%).
Proposed.use.as.biosolids.amendment:.
complex.with.sulfur.compounds,.degrade.
toxic.organics,.and.sequestrate.Hg,.Pb.
Encapsulated.ZVI
Variations.of.nZVI:
Bench.scale
[40,.41]
.
.•.Silica.nanoshells
Hollow.silica.shells.containing.ZVI.are.being.studied.
for.application.to.treatment.of.aqueous.and.
nonaqueous.liquids.
nZVI.in.silica.nanoshell.being.evaluated.
to.treat.TCE.
.
.•.Ferritin.protein.cage
Ferritin.is.an.iron-storage.protein.with.a.nano.ferrihydrite.
(iron.oxide).core.within.a.spherical.protein.cage..
Researchers.believe.that.this.structure.will.allow.
control.of.the.size.and.electronic.structure.of.the.
particle.to.affect.surface.chemistry.
nZVI.in.ferritin.protein.cage.used.to.treat.
sulfur.dioxide;.may.have.other.catalytic.
applications.
