AI Article Synopsis
- Nanotube morphology of Titania is effective for charge transfer and stability but suffers from high recombination issues, prompting a study to improve photocatalytic performance.
- Ion exchange with univalent elements (H and Na) into Titania nanotubes enhanced photocatalytic degradation performance, with NaTNT outperforming H-TNT.
- NaTNT achieved a remarkable 99% removal of methylene blue (MB) under UV-A light in just 10 minutes, showing strong reusability and superoxide radicals as the main reactive species.
Article Abstract
Although nanotube is among the most effective morphology of Titania due to its unilateral pathway for photo-generated charge transfer and mechanical stability, its performance is still hampered by high recombination. In the present study, to further improve the photocatalytic degradation performance of Titania, univalent elements of H and Na were respectively ion-exchanged into the Titania nanotubes (TNTs). The photocatalyst was characterized using XRD, TEM, ICP-AES, and FTIR. The modified samples displayed enhanced photocatalytic degradation performance over Degussa TiO under UV-A light illumination of MB. The rate constants of NaTNT and HTNT were 16 and 13 times that of Degussa TiO. Specifically, the Na-TNTs showed better photocatalytic degradation activity than H-TNTs with a rate constant of 0.12 min while the latter showed 0.09 min. The optimum adsorption and photocatalytic performance of NaTNT were determined at pH 6 achieving about 99% MB removal within 10 min of irradiation. The ion exchange NaTNT displayed excellent reusability after the fifth cycle of the photocatalytic tests and superoxide radicals were experimentally determined to be the main reactive oxygen species involved in the photocatalytic degradation of MB.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9803790 | PMC |
| http://dx.doi.org/10.1016/j.heliyon.2022.e12610 | DOI Listing |
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