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Materials 2019, 12(8), 1195; https://doi.org/10.3390/ma12081195

Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

1
Faculty of Chemistry, Thai Nguyen University of Education, Thai Nguyen City 24000, Vietnam
2
Faculty of Physics, Thai Nguyen University of Education, Thai Nguyen City 24000, Vietnam
3
NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 70000, Vietnam
4
Center of Excellence for Green Energy and Environmental Nanomaterials, Nguyen Tat Thanh University, Ho Chi Minh City 70000, Vietnam
5
Center of Excellence for Functional Polymers and NanoEngineering, Nguyen Tat Thanh University, Ho Chi Minh City 70000, Vietnam
*
Authors to whom correspondence should be addressed.
Received: 15 March 2019 / Revised: 27 March 2019 / Accepted: 3 April 2019 / Published: 12 April 2019
(This article belongs to the Special Issue Photocatalysis for Wastewater Treatment)
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Abstract

Lanthanum (La)-doped zinc oxide nanoparticles were synthesized with different La concentrations by employing a gel combustion method using poly(vinyl alcohol) (PVA). The as-synthesized photocatalysts were characterized using various techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), photoluminescence (PL) spectroscopy, and UV–visible absorption spectroscopy. The average size of ZnO nanoparticles decreased from 34.3 to 10.3 nm with increasing concentrations of La, and the band gap, as evaluated by linear fitting, decreased from 3.10 to 2.78 eV. Additionally, it was found that the photocatalytic activity of doped samples, as investigated by using methyl orange dye under visible lights, improved in response to the increase in La concentration. The decomposition of methyl orange reached 85.86% after 150 min in visible light using La0.1Zn0.9O as the photocatalyst. View Full-Text
Keywords: La-doped zinc oxide; nanoparticles; gel combustion; optical property; photocatalytic activity La-doped zinc oxide; nanoparticles; gel combustion; optical property; photocatalytic activity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nguyen, L.T.T.; Nguyen, L.T.H.; Duong, A.T.T.; Nguyen, B.D.; Quang Hai, N.; Chu, V.H.; Nguyen, T.D.; Bach, L.G. Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles. Materials 2019, 12, 1195.

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