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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3875
Title: Synthesis, characterization and enhanced photocatalytic degradation efficiency of Se doped ZnO nanoparticles using trypan blue as a model dye
Authors: Nenavathu B.P.
Krishna Rao A.V.R.
Goyal A.
Kapoor A.
Dutta R.K.
Published in: Applied Catalysis A: General
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 SeO 2 in the doped ZnO NPs. Fluorescence emission spectroscopy of Se doped ZnO NPs revealed oxygen vacancies which increased with the concentration of Se doping. The photodegradation efficiency of trypan blue (TB) using 30 W 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. © 2013 Elsevier B.V. All rights reserved.
Citation: Applied Catalysis A: General (2013), 459(): 106-113
URI: https://doi.org/10.1016/j.apcata.2013.04.001
http://repository.iitr.ac.in/handle/123456789/3875
Issue Date: 2013
Keywords: Photocatalytic dye degradation
Reactive oxygen species
Selenium doping
Thermo-mechanical
X-ray photoelectron spectroscopy
ZnO nanoparticles
ISSN: 0926860X
Author Scopus IDs: 54973824800
55694120200
57197522024
57193984615
47161194700
Author Affiliations: Nenavathu, B.P., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
Krishna Rao, A.V.R., Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247667, India
Goyal, A., Solid State Physics Laboratory, Lucknow Road, Timarpur, New Delhi 110054, India
Kapoor, A., Solid State Physics Laboratory, Lucknow Road, Timarpur, New Delhi 110054, India
Dutta, R.K., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India, Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247667, India
Funding Details: Authors thank BRNS, India for supporting the research work (Project No. 2007/37/47/BRNS). Authors also thank Dr. A.V.R. Reddy, Bhabha Atomic Research Centre, Mumbai, India for his keen interest and encouragement in this work. Bhavani P. Nenavathu and A.V.R. Krishna Rao are grateful to Ministry of Human Resource Development (MHRD), Government of India for funding fellowship. The instrumental facilities at the Institute Instrumentation Center of IIT Roorkee are acknowledged. Appendix A
Corresponding Author: Dutta, R.K.; Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India; email: duttafcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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