Visible light-driven photocatalytic degradation of organic pollutantsviacarbon quantum dots/TiO2
Wang K. Liang L. Zheng Y. Li H. Niu X. Zhang D. Fan H.
21 September 2021Royal Society of Chemistry
New Journal of Chemistry
2021#45Issue 3516168 - 16178 pp.
Using olive leaves as the carbon source, carbon quantum dots (CQDs) with up-conversion luminescence were preparedviaa reflux method. Through a hydrothermal treatment, CQDs were loaded on the surface of TiO2to form a CQDs/TiO2composite that exhibited photocatalytic properties. The morphology, size and composition of the as-prepared composite were characterized using XRD, SEM, TEM and XPS. Excited at the wavelength range from 560 nm to 740 nm, CQDs exhibited a significant multi-photon-based up-conversion luminescence property. This property of CQDs endowed CQDs/TiO2composites with great photocatalytic efficiency. The performance of CQDs/TiO2composites was tested in the degradation of tetracycline (TC) and rhodamine B (RhB). Irradiated under visible light for 10 min and 70 min, the degradation rates of 5% CQDs/TiO2reached 81% and 92% for TC and RhB, respectively. Photocurrent and PL tests indicated that the loading of CQDs significantly improved the separation efficiency of TiO2-photogenerated charge carriers. Taking advantage of the up-conversion luminescence property of CQDs, the harvesting efficiency of visible light by CQDs/TiO2composites was greatly enhanced.
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School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China
Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou, 730050, China
Chemistry Department, Nazarbayev University, Astana, 010000, Kazakhstan
School of Petrochemical Technology
Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province
Chemistry Department
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