Environmental Engineering Reference
In-Depth Information
Fig. 6.13 (A) Schematic diagram for the synthesis of mesoporous-Fe
3
O
4
silanized by
3-APTES. (B) DRIFTS spectra of mesoporous-Fe
3
O
4
magnetic particles; after (a) calcina-
tion, (b) rehydroxylation, and (c) silanation by 3-APTES from toluene
6.5 Practical Applications of MCS
Utilizing the magnetic composite particles to selectively remove heavy metals
from industrial effluents or contaminated municipal water or to be used in
biological cell separation and biological sensing, the most important thing is to
functionlize the surface with specific ligands having specific interaction with
targets (heavy metals or bio-molecules), endowing the surface a strong and
specific affinity for targeted metal ions. There are two ways to reach this goal,
one is direct molecular self-assembling and the other one is by silanation of
specific function groups, which allows more versatile groups to be used. The
silanation is a promising avenue for introducing specific surface functional
groups on mesoporous silica surfaces [112, 124, 125, 126, 127, 128, 129].
6.5.1 SA Monolayer
6.5.1.1 Cu
2+
and Ag
+
Removal
The MHA-coated g-Fe
2
O
3
particles (Section 6.4.1) prepared by the SA method
contain reactive thiol and/or disulfide groups that are known to have strong
