Environmental Engineering Reference
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FIGURE 1.4
Illustration of the ideal hybrid interlaminar architecture: (A) CNTs placed
in between two plies of a laminated composite and (B) close-up of the crack, showing
CNTs bridging the crack between the two plies.
1.1.6.8 CNT-PANI COMPOSITES AS ADSORBENT
This study confirms that DP/MWCNTs is a potential adsorbent for the removal
of Cr(VI) from aqueous solution. The functional groups present on the surface
of adsorbent mainly, amine or imine groups of polyaniline and exposed surface
and internal porous structure sites were mainly responsible for the adsorption of
Cr(VI). The optimum Cr(VI) adsorption was found at pH 2. The equilibrium iso-
therm and kinetic results suggested that the adsorption was heterogeneous, multi-
layer and controlled through a boundary layer effect. The higher value of enthalpy
change (DH) and incomplete desorption suggested that chemisorptions was main
mechanism involved in the adsorption of Cr (VI).
Due to its outstanding stability in acidic solution, organic magnetic materials
have attracted considerable attention and are viewed as a promising substitute
for metal and metal oxide based magnetic materials. Among them, polyaniline
(PANI) is one of the most attractive magnetic polymers because of its excellent
chemical stability, easy synthesis and excellent magnetic property. Because the
large amount of amine and imine functional groups of PANI are expected to have
strong affinity with metal ions, PANI can enrich and remove heavy metal con-
taminants from aqueous solutions easily and effectively. Considering the promis-
ing magnetic property of PANI and excellent adsorption capacity of MWCNTs,
PANI/MWCNTs magnetic composites might be an attractive material in the re-
moval of heavy metal contaminants from large volumes of aqueous solutions.
Comparing to conventional chemical methods, plasma technique has many ad-
vantages in surface modification of various materials. Some researchers also
modified single walled carbon nanotubes with PANI by using plasma induced
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