Publication: Boosting tetracycline degradation with an s-scheme heterojunction of n-doped carbon quantum dots-decorated TiO2
Program
School / College / Institute
College of Sciences
Research Center
Research Center
KU-Authors
KU Authors
Co-Authors
Karaca, Melike
Acisli, Ozkan
Karaca, Semra
Publication Date
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Type
Embargo Status
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Volume Title
Alternative Title
Abstract
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.
Source
Publisher
American Chemical Society
Subject
Chemistry, multidisciplinary, Green and sustainable science and technology, Engineering, chemical
Citation
Has Part
Source
ACS Omega
Book Series Title
Edition
DOI
10.1021/acsomega.3c03532