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Boosting tetracycline degradation with an s-scheme heterojunction of n-doped carbon quantum dots-decorated TiO2

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College of Sciences
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Karaca, Melike
Acisli, Ozkan
Karaca, Semra

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N-doped carbon quantum dots (N-CQDs) derived from the Rumex crispus L. plant were incorporated into TiO2 via a facile hydrothermal method. Asprepared materials were characterized and used in the photocatalytic tetracycline (TC) degradation under UVA light irradiation by examining several operational parameters involving the N-CQDs amount, initial TC concentration, pH, and photocatalytic reaction time. XRD analysis revealed the conversion of the rutile phase to the anatase phase after the incorporation of N-CQDs into the TiO2 structure. The results revealed that the N-CQDs/TiO2 photocatalysts demonstrated the highest efficiency in TC degradation compared to other processes of adsorption, photolysis (UVA), and photocatalysis with TiO2 (TiO2/UVA). Under optimized conditions, 10 mg/L TC at pH 5.15 with 0.2 g/L N-CQDs/TiO2 catalyst showed 97.7% photocatalytic degradation for 120 min under UVA irradiation. The formation of an S-scheme heterojunction between N-CQDs and TiO2 provided enhanced charge separation and strong redox capability, causing significant improvement in the photocatalytic performance of N-CQDs/TiO2. Trapping experiments showed that O-2(-) and h(+) are the predominant reactive species for the TC elimination in an aqueous solution.

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American Chemical Society

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Chemistry, multidisciplinary, Green and sustainable science and technology, Engineering, chemical

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ACS Omega

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10.1021/acsomega.3c03532

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