Abstract
In the present work, zinc tungstate (ZnWO4) nanoparticles were synthesized by a simple co-precipitation technique without the addition of any templates and complexing agent. The X-ray diffraction study confirmed the formation of monoclinic structure ZnWO4. The annealing temperatures play a significant role on the crystallization of the samples and the crystallite size of ZnWO4 nanoparticles are varied between 30 and 65 nm. The well dispersed spherical solid shells along with nanoplatelet like morphology was obtained from the surface morphological study. The concomitant decrease in optical energy band gap value of ZnWO4 is due to the effect of crystallite size enhancement. It was observed that the crystallinity is one of the primary factors that affect the luminescence property of ZnWO4 nanoparticles. The purity and stoichiometric nature of synthesized product was confirmed by compositional analysis. The highest degradation efficiency of 87% was observed for 300 °C annealed ZnWO4 nanoparticles in the photocatalytic study by the degradation of methylene blue dye under ultraviolet light irradiation. The photocatalytic study confirmed the decomposition of methylene blue after 1 h irradiation.
Highlights
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Pure ZnWO4 nanoparticles were successfully synthesized by co-precipitation method.
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The well dispersed spherical solid shells along with nanoplatelet morphology were obtained.
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The photocatalytic kinetic study confirmed decomposition of MB after 1 hr irradiation.
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The highest degradation efficiency of 87% was observed for ZnWO4 nanoparticles.
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Acknowledgements
RS and GVG gratefully acknowledges the Department of Education, Government of India for the financial support under RUSA - Phase 2.0 Scheme (Ref. No.: F. 24-51 /2014-U, Policy (TN Multi-Gen), dt. 09.10.2018). In addition, RS sincerely acknowledges the Department of Science and Technology, New Delhi, India for the financial support in general and infrastructure facilities sponsored under PURSE 2nd Phase (Ref. No.: SR/PURSE Phase 2/38 (G) dt. 21.02.2017) and FIST (SR/FST/PSI-202/2015) programmes. Further, RS acknowledges the University Grants Commission, New Delhi, India for the financial support under SAP (F.530/18/DRS-III/2015) scheme. Thanks are due to Drs. E. Kannapiran and S. Karuppusamy, Alagappa University, India for their assistance in the measurement.
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Geetha, G.V., Sivakumar, R., Sanjeeviraja, C. et al. Photocatalytic degradation of methylene blue dye using ZnWO4 catalyst prepared by a simple co-precipitation technique. J Sol-Gel Sci Technol 97, 572–580 (2021). https://doi.org/10.1007/s10971-021-05480-7
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DOI: https://doi.org/10.1007/s10971-021-05480-7