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April 15-16, 2019 | Frankfurt, Germany
Oncology Nursing and Cancer Care
16
th
International Conference on
Journal of Medical Oncology and Therapeutics | Volume 4
Polyaniline supported CdS/CeO
2
/Ag
3
PO
4
nanocomposite: Synthesis, characterization
and photocatalytic activity for methyl orange dye degradation
Tigabu Bekele Mekonnen
Mekdela Amba University, Ethiopia
I
n thepresentwork, different types of photocatalysts
in single, binary and ternary systems with different
molar ratios (1:1, 2:1, 3:1 and 4:1) of CdS: CeO
2
/
Ag
3
PO
4
was synthesized by co-precipitation
method. Polyaniline supported CdS/CeO
2
/Ag
3
PO
4
nanocomposite was also synthesized by “
in situ
”
chemical oxidative method. Crystal structure, surface
area, morphology, band gap energy, functional
groups, optical properties and electron transfer of
the as-synthesized photocatalysts were characterized
by using XRD, BET, SEM-EDX, UV/Vis, FTIR, PL and EIS
instruments, respectively. Photocatalytic activities
of single, binary, bare and supported ternary
nanocomposite were evaluated by using aqueous
solution of model pollutant methyl orange dye (MeO)
as well as a real sewage sample solution collected
from Bahirdar Textile Share Company. Photocatalytic
activities of ternary CdS/CeO
2
/Ag
3
PO
4
(1:1, 2:1,
3:1 and 4:1 molar ratios) nanocomposite were
found to be higher than those of single and binary
counterparts. The effect of operational parameters
suchaspH, initial dyeconcentrationandphotocatalyst
load in MeO dye degradation were investigated by
using polyaniline supported CdS/CeO
2
/Ag
3
PO
4
(PAST)
nanocomposite. At optimum operating conditions,
photodegradation efficiencies of the bare (CCA4)
and supported (PAST) ternary systems were found
to be 83.71 and 93.99%, respectively. The effect of
different scavengers suggest that •O2
-
and •OH are
the principal species involved in the decolorization
of MeO. Supported photocatalyst also exhibited a
relatively higher efficiency on the photodegradation
of MeO than real sewage sample solutions which is
about 93.44 and 70.74%, respectively. The reusability
of supported photocatalyst was tested and only
about 20% decrement was observed after four
successive runs. Photocatalytic degradation of MeO
dye follows the pseudo first order kinetics for the
entire as-synthesizednanocomposite. The results also
suggest that the PANI supported CdS/CeO
2
/Ag
3
PO
4
/
GCE nanocomposite could act as excellent electron
transfer medium and enhance electron transfer.
Speaker Biography
Tigabu Bekele Mekonnen, he had completed his MSc at the age of 25
years from Haramaya University. He is now an instructor in Mekdela
Amba universty, Ethiopia. He done his research at Nanocomposite and
Nanotechnology.
e:
tgbekele19@gmail.com