Quantum-Sized Chitosan Modified ZnO for the Photocatalytic Oxidation of Oxytetracycline Under Fluorescent Light Irradiation

Normawati, Jasni and Anwar, Iqbal and Noor Hana, Hanif Abu Bakar and Devagi, Kanakaraju and Dede Heri, Yuli Yanto and Muhammad Rahimi, Yusop and Harits Atika, Ariyanta (2023) Quantum-Sized Chitosan Modified ZnO for the Photocatalytic Oxidation of Oxytetracycline Under Fluorescent Light Irradiation. Journal of Cluster Science. pp. 1-15. ISSN 1572-8862

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Abstract

This study explores the ability of chitosan to control the size of ZnO quantum dots (CHT/ZnO QDs) and defects formation via the microwave-assisted method, as well as their photocatalytic oxidation activity towards oxytetracycline (OTC). The intramolecular and intermolecular hydrogen bonds within the chitosan -OH and -NH2 were altered by ZnO and microwave radiation. As a result, the particle size decreased from 9.35 ± 0.21 nm to 7.86 ± 0.28 nm. Additionally, the presence of chitosan led to higher oxygen vacancies ( Vs o) and Zni interstitials. The small size enhanced the absorption of photons, while defects suppressed the recombination rate of photogenerated electron/hole (e−/h+) pairs. The synthesized CHT/ZnO QDs exhibit outstanding photocatalytic performance by removing 97.4% of OTC within 40 min through pseudo-first-order kinetics with the rate constant (k) of 0.0568 min− 1 and driven by the h+ and O⋅−2 . This result was achieved by comprehensively investigating the impact of pH condition, initial concentration of OTC, and photocatalyst dosage. We believe that this work provides a potential photocatalyst design for antibiotics removal.

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