Environmental Engineering Reference
In-Depth Information
FIGURE 1.2
Schematic illustration of the possible interaction between MWCNTs and
methylene blue: (a) electrostatic attraction and (b) π-π stacking.
CNTs can be combined with various metal oxides for the degradation of
some organic pollutants too. Carbon nanotubes/metal oxide (CNT/MO) compos-
ites can be prepared by various methods such as wet chemical, sol gel, physi-
cal and mechanical methods. To form nanocomposite, CNTs can be combined
with various metal oxides like Ti
2
O
3
, ZnO, WO
3
,Fe
2
O
3
, and Al
2
O
3
. The produced
nanocomposite can be used for the removal of various pollutants. Nanoscale Pd/
Fe particles were combined with MWNTs and the resulted composite was used
to remove2,4-dichlorophenol (2,4-DCP). It was reported that the MB adsorption
was pH-dependent and adsorption kinetics was best described by the pseudo sec-
ond-order model. Iron oxide/CNT composite was reported to be efficient adsor-
bent for remediation of chlorinated hydrocarbons. The efficiency of some other
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