Synthesis, characterization and enhanced photocatalytic degradation efficiency of Se doped ZnO nanoparticles using trypan blue as a model dye

Authors: Bhavani P. Nenavathu, A.V.R. Krishna Rao, Anshu Goyal, Ashok Kapoor, Raj Kumar Dutta

Abstract:
Se doped ZnO nanoparticles (NPs) were successfully synthesized by thermo-mechanical method whose band gap increased with concentration of Se doping. Transmission electron microscopy of 5 wt% Se doped ZnO NPs revealed spherical nanoparticles of average size of 9.5 nm. X-ray photoelectron spectroscopy (XPS) revealed Se 3d binding energy at 59.5 eV, confirmed SeO₂ in the doped ZnO NPs. Fluorescence emissionspectroscopy of SedopedZnO NPs revealedoxygenvacancies whichincreased withthe concentration of Se doping. The photodegradation efficiency of trypan blue (TB) using 30W UV lamp was higher for Se doped ZnO NPs than pristine ZnO NPs, depended on Se doping concentrations, UV illumination, concentrations of photocatalyst and pH of the dye solution. The batch of 0.6 mg of 5 wt% Se doped in ZnO NPs per mL of TB dye maintained at pH 5 exhibited maximum photodegradation efficiency (89.2 ± 3.1%). Higher photocatalytic degradation efficiency for Se doped ZnO NPs was correlated with incorporation of oxygen vacancies due to Se doping, which were likely intermediate levels for transiting photoexcited charge carriers for generation of hydroxyl radicals and consequently facilitated photodegradation. Terephthalic acid assay confirmed formation of hydroxyl radicals in dye solution treated with photocatalyst.

Keywords:
Photocatalytic dye degradation
ZnO nanoparticles Selenium doping
Thermo-mechanical
Reactive oxygen species
X-ray photoelectron spectroscopy

Published in: Applied catalysis A: General  (Volume 459, Pages 1-130, 24 May 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Synthesis, characterization and enhanced photocatalytic degradation efficiency of Se doped ZnO nanoparticles using trypan blue as a model dye

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