Page 530 - Polymer-based Nanocomposites for Energy and Environmental Applications

Polypyrrole-based nanocomposite adsorbents 483

2+
Fig. 17.10 A schematic drawing of Hg electrochemically selective detection by the PPy/RGO
nanocomposite.
Reproduced from Zhao Z-Q, Chen X, Yang Q, Liu J-H, Huang X-J. Beyond the selective
2+
adsorption of polypyrrole-reduced graphene oxide nanocomposite toward Hg : ultra-sensitive
and -selective sensing Pb 2+ by stripping voltammetry. Electrochem Commun 2012;23:21–4.

by SEM, EDX, TEM, FTIR, and XRD techniques. The as-prepared graphene oxide-
polypyrrole nanocomposite was used for adsorption of chromium ions, with adsorp-
tion capacity being 5.644 mmol/g, which is about two times as large as that of con-
ventional PPy nanoparticles. Similar nanocomposite based on polypyrrole/graphene
oxide nanocomposite was synthesized and investigated for adsorption of chromium
(VI) ions, and sorption capacity was reported as high as 625 mg/g at optimum pH of
2 and at 25°C temperature [68].
Graphene oxide/poly(1-(3-aminopropyl)pyrrole) has been prepared by in situ
cross-linking polymerization method and used as an adsorbent for the removal of a
number of nonradioactive metal ions from aqueous solution [69]. The composite
was characterized using several measurements to demonstrate that the polymer mono-
mer was successfully grafted on the surface of GO. The poly(GO-APP) copolymer
was a conductive material. The swelling of poly(GO-APP) and the adsorption of metal
ions were investigated by both experiments and theoretic fitting, which showed that
the poly(GO-APP) had enhanced swelling and adsorption properties.
Polypyrrole-impregnated porous carbon was prepared via vapor infiltration poly-
merization of pyrrole monomers [70]. In this case, porous carbon was initially
functionalized with pyrrole monomers by introducing pyrrole into a reactor containing
porous carbon at room temperature and under reduced pressure and then vaporized by