Page 70 - 00. Complete Version - Progress Report IPEN 2014-2016

70 Application of Ionizing Radiations | Progress Report

conductivity of the nanocomposites. Ionizing radiation
(electron beam and gamma radiation) was utilized to syn-
thesized and combine nickel, copper, palladium and silver
nanoparticle on graphene-based material. This method-
ology requires neither toxic reagents nor generates toxic
wastes. These new nano-composites have several applica-
tions in the electrochemical field, such as components for
supercapacitors, solar cells, sensors, electro catalysis and
lithium batteries.

Graphene oxide as adsorbent for Cesium ions removal
from aqueous solution and radioactive liquid waste.

Graphene Oxide (GO) is a graphene-based nanomateri-
al that has enticed attention on account of its function-
alized surface which comprises hydroxyl, epoxy, carbonyl
and carboxyl groups, and has a robust complexation abil-
ity with ion metal. GO has shown high sorption compe-
tence to eliminate cesium ion from aqueous solution. The
trials were performed in batch and the following param-
eters were considered: contact time, pH and cesium ion
concentration in aqueous solution. An equilibrium was
reached after 60 minutes contact in neutral solution. The
percentage of removal was around 80%.

Figure 39. The image by electron microscopy scan
coupled to an energy dispersive spectrometer
shows cesium ions on the graphene oxide surface.

Coconut fibers in raw and treated forms for
Sr+2 removal from radioactive liquid wastes

90Sr, a radioactive isotope of strontium, is one of the fission
products and generally present in the radioactive waste

Instituto de Pesquisas Energéticas e Nucleares