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Synthetization pill-like C-doped ZnO nano-photocatalyst for removing ofloxacin and methylene blue under visible light

Luu, T.V.H. and Tho, N.T.M. and Thuy, T.T.T. and Thong, L.N. and Dung, N.T. and Dang, P.H. (2024) Synthetization pill-like C-doped ZnO nano-photocatalyst for removing ofloxacin and methylene blue under visible light. Journal of Sol-Gel Science and Technology. ISSN 09280707

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Abstract

Carbon-doped zinc oxides were synthesized with different concentrations corresponding to PVA/Zn2+ molar ratios between 5 and 15 by the hydrothermal method. The XRD and SEM results show that the obtained materials have high crystallinity and a pill-like morphology. Carbon dopant significantly decreased band gap energy (EgCZ3 = 2.77 eV), improving the optical absorption of ZnO in the visible and ultraviolet regions. Generally, the catalyst with carbon doped 1.49 (CZ3), corresponding to the molar ratio of PVA/Zn2+ = 15, showed the highest photocatalytic efficiency of ofloxacin (Ofx) and methylene blue (MB) and was higher than pure ZnO. This is possibly attributed to its morphology with good uniformity and porosity; the specific surface area of SCZ3 is 26 m2/g which is 1.5 times higher than ZnO. Moreover, it is also relative to the stable and highest saturation photocurrent density of CZ3, which is ∼6.4 µA.cm−2, 4.15 times higher than pure ZnO. In addition, trapping experiments showed that positive holes and hydroxyl radicals were the predominant active agents. Finally, COD and TOC analysis results suggested that the photodegradation progress of MB and Ofx formed organic compounds with smaller structures and proved that over 78 of MB and 66 of Ofx were converted entirely to simple inorganic substances such as CO2, H2O, etc. Graphical Abstract: (Figure presented.). © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

Item Type: Article
Divisions: Offices > Office of International Cooperation
Identification Number: 10.1007/s10971-024-06348-2
Uncontrolled Keywords: Aromatic compounds; Crystallinity; Energy gap; II-VI semiconductors; Light absorption; Morphology; Photocatalytic activity; Zinc oxide, C-doped ZnO; Doped zinc oxides; Hydrothermal methods; Methylene Blue; Molar ratio; Nano photocatalysts; Ofloxacin; Pure ZnO; Synthesised; Visible light, Molar ratio
URI: http://eprints.lqdtu.edu.vn/id/eprint/11161

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