Nanoscale Porous Materials for Water Treatment: Advances and Challenges - Nanotechnologies for Water Environment Applications - page 318

activated carbons (Anderson, 2000). TCE sorption on the wet zeolites decreased with
increasing surface cation density. Results suggest that TCE be adsorbed in hydrophobic
micropores by displacing loosely bound water, consistent with the theoretical
considerations. This indicates that the process of transferring loosely bound water from
hydrophobic micropores into the bulk phase is energetically favorable (Cheng and
Reinhard, 2006).
Table 11.3 Summary of water treatment by zeolite containing adsorbent.
Type of
Zeolite

Contaminants
Removed
(mg/g)

Issues Ref.

NH 4 + :4.5
Ni 2+ : 2.3
Zn 2+ : 2.5

Clinoptilolite Cheap but low adsorption capacity (Johnson

and Worrall,
2007)

NH 4 + :13.2
Ni 2+ :16.5
Zn 2+ :18

Synthetic
Zeolites-
Vermiculite

Modified zeolite has more adsorption
capacity

NH 4 + :13.64

Natural
Zeolite

Cheap (Maranon et

al., 2006)

Zn 2+ : 31.58 Synthetic

Zeolite
Powders

Synthetic zeolite in powder form has
more adsorption capacity

(Hui et al.,
2005)

Zeolites with
High SiO 2 /
Al 2 O 3 Ratios

methyl tert-butyl
ether (MTBE),
CHCl 3 & TCE

An equilibrium solution concentration
of 100 g/L, high Si mordenite retained
812 × more MTBE than PACs

(Anderson,
2000)

Y zeolites
from
Hydrophilic
CBV-300 to -
720 & -780

TCE Sorption of volatile organic compounds

(VOCs) in low organic carbon (< 0.1%)
geosorbents is difficult to predict
because the sorption capacity of the
mineral matrix is poorly understood

(Cheng and
Reinhard,
2006)

Solid Na-Y
Zeolite

Pb and Cd Pb and Cd removal from solution by

batch ion exchange with a solid Na---Y
zeolite has been studied

(Ahmed et
al., 1998)

Natural
Zeolite

Fe, Pb, Cd, and
Zn from synthetic
mine waters

Pb was removed efficiently from neutral
as well as from acidic solutions, whereas
the uptake of Zn and Cd decreased with
low pH and high iron concentrations

(Wingenfeld
er et al.,
2005)

Co 2+ , Cr 3+ , Cu 2+ ,
Zn 2+ & Ni 2+

Zeolite 4A The removal performance and the

selectivity sequence of the mixed metal
ions were investigated by adsorption on
pure and chamfered-edge zeolite 4A
prepared from coal fly ash (CFA),
commercial grade zeolite 4A and the
residual products recycled from CFA

(Hui et al.,
2005)