Abstract:
In this study, various photocataltic materials viz.,single (TiO2,CdS,Ag3PO4), binary(CdS/TiO2;
Ag3PO4/TiO2) and ternary (CdS/TiO2/Ag3PO4) systems have been prepared via precipitation
and impregnation methods. A geomedia, zeolite, was used to immobilize the selected ternary
composite to fabricate Zeolite supported CdS/TiO2/Ag3PO4.Optical properties, band gap
energy, functional groups and crystal structure of the as synthesized photocatalysts were
characterized by using PL, UV/Vis, FTIR and XRD respectively. Photocataltic activities of the
nano composites under visible light irradiation were evaluated on aqueous solution
comprising model pollutant methyl orange dye (MeO), as well as on a real sewage sample
collected from Bahirdar Textile industry. Results suggested that the zeolite supported ternary
nano-composite photocatalyst exhibited a relatively higher efficiency on the photodegradation
of both Methyl Orange (MeO) 90.4% and real sewage sample solutions 75%. Photocatalytic
activities results suggested that the zeolite supported ternary nano composite exhibited a
relatively higher degradation efficiency compared with single, binary and ternary systems.
This was due to the sorption or ion exchange ability of the zeolite material. The effect of
operational parameters such as pH, scavenger, initial dye concentration and photocatalyst
load in MeO dye degradation were studdied by appling bare and Zeolite supported
CdS/TiO2/Ag3PO4 nanocomposite. Stability of the as synthesized supported photocatalyst was
tested and only about 17.8% decrement was seen after four successive cycles. Different scaven
gers suggest that •O2 •OH and h+ are the species involved in the degradation of MeO
