Chan, Yim Leng
(2014)
Synthesis And Characterization Of Zno, V2O5 And Mno2
Nanostructures Photocatalysts On Polyetylene
Terephthalate (Pet) Fiber For Degradation Of Rhb Dye.
Masters thesis, Perpustakaan Hamzah Sendut.
Abstract
Increasing pollution into the water system particularly from textile industries and
agriculture has become a source of health concern across the globe. Advanced oxidation
process is a rapid developing research field for the application in degradation of organic
the semiconductor's surface in the
presence of UV or visible light irradiation. In order to utilize sunlight effectively for
organic pollutants removal, the photocatalytic activities of wide bandgap semiconductor
(ZnO. Eg =3.37 eV) and narrow bandgap semiconductors (MnO2. Eg = 1.00 to I.<30 eV and
polymorphs of MnO2 nanoparticles were synthesized using hydrothermal method by
adjusting the ratio of KM11O4 and MnSO4. The photodegradation of RhB solution by these
semiconductor nanoparticles followed first order kinetic. Under UV irradiation. ZnO has
good photodegradation efficiency (0.034 min'1). On the other hand. V2O.s nanorods and p-
MnO2 nanoparticles degraded RhB dye under visible light with rate constant of 0.01 5 min'1
and 0.022 min'1 respectively. A relined photodegradation model of RhB solution by these
semiconductor photocatalysts is proposed. Two processes, i.e. N-deethylation and
cycloreversion happen simultaneously during the photodegradation of RhB solution.
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