Kumara Swamy, N. and Mohana, K. N. S. and Yashas, S. R. (2022) GNR@CeO2 heterojunction as a novel sonophotocatalyst: Degradation of tetracycline hydrochloride, kinetic modeling and synergistic effects. Colloids and Surfaces A-Physicochemical and Engineering Aspects, 639. ISSN 1873-4359
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Tetracycline hydrochloride (TCH) is an antibiotic whose presence in aqueous environments, even in trace concentrations, is unsafe for living beings. This work reports the fabrication of a promising sonophotocatalyst, graphene nanoribbon-cerium oxide (GNR@CeO2) heterojunction, for the UV-light driven sonophotocatalytic degradation of TCH. First, GNR@CeO2 heterojunction was fabricated by the simple sonication assisted 1:1 (w/w) doping of cerium oxide (CeO2) nanomaterial onto graphene nanoribbons (GNRs) surface. Further, the GNR, CeO2 and GNR@CeO2 heterojunctions (20 mg L-1 each) were separately investigated as catalysts in the sonocatalytic (40 kHz ultrasound), photocatalytic (390-400 rpm, UV: 365 nm) and sonophotocatalytic (40 kHz ultrasound, 390-400 rpm, UV: 365 nm) processes for the degradation of TCH (70 mL of 20 mg L-1 stock). Among the treatment modes, the GNR, CeO2 and GNR@CeO2 heterojunction catalyzed sonophotocatalytic modes recorded the highest TCH removals with 72.9%, 68.3% and 91.2% respectively in 120 min duration. Degradation rates and dynamics obeyed pseudo-first-order kinetics in all the treatment modes. However, GNR@CeO(2 )catalyzed sonophotocatalytic mode showed the highest degradation rate with the rate constant k = 0.0290 min(-1) and correlation coefficient R-2 = 0.999, suggesting that the proposed heterojunction acts as effective sonophotocatalyst. The synergy index calculated from the kinetic data also suggests excellent inter-process and inter-catalyst synergy for GNR@CeO2 catalyzed sonophotocatalytic mode. Further, GNR@CeO2 heterojunction also showed high reusability and stability in the sonophotocatalytic process, suggesting that the heterojunction coupled with ultrasound and UV-light serve as practically reliable decontamination system for the removal of TCH in water and wastewaters.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Graphene nanoribbon; Cerium oxide; Tetracycline; Sonophotocatalysis; Heterojunction |
| Subjects: | C Chemical Science > Chemistry |
| Divisions: | Department of > Chemistry |
| Depositing User: | C Swapna Library Assistant |
| Date Deposited: | 05 Sep 2023 10:25 |
| Last Modified: | 05 Sep 2023 10:25 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/17731 |
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