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A Comparative Study of Microcystin-LR Degradation by UV-A, Solar and Visible Light Irradiation Using Bare and C/N/S-Modified Titania
| Title: | A Comparative Study of Microcystin-LR Degradation by UV-A, Solar and Visible Light Irradiation Using Bare and C/N/S-Modified Titania |
| Authors: | Khedr, Tamer M. Browse this author | | El-Sheikh, Said M. Browse this author | | Abdeldayem, Hany M. Browse this author | | Ismail, Adel A. Browse this author | | Kowalska, Ewa Browse this author →ORCID | | Bahnemann, Detlef W. Browse this author |
| Keywords: | anatase/brookite | | non-metal co-modification | | emerging pollutants | | cyanotoxins | | microcystin-LR | | photodecomposition |
| Issue Date: | Nov-2019 |
| Publisher: | MDPI |
| Journal Title: | Catalysts |
| Volume: | 9 |
| Issue: | 11 |
| Start Page: | 877 |
| Publisher DOI: | 10.3390/catal9110877 |
| Abstract: | In an endeavor to tackle environmental problems, the photodegradation of microcystin-LR (MC-LR), one of the most common and toxic cyanotoxins, produced by the cyanobacteria blooms, was examined using nanostructured TiO2 photocatalysts (anatase, brookite, anatase–brookite, and C/N/S co-modified anatase–brookite) under UV-A, solar and visible light irradiation. The tailoring of TiO2 properties to hinder the electron–hole recombination and improve MC-LR adsorption on TiO2 surface was achieved by altering the preparation pH value. The highest photocatalytic efficiency was 97% and 99% with degradation rate of 0.002 mmol L−1 min−1 and 0.0007 mmol L−1 min−1 under UV and solar irradiation, respectively, using a bare TiO2 photocatalyst prepared at pH 10 with anatase to brookite ratio of ca. 1:2.5. However, the bare TiO2 samples were hardly active under visible light irradiation (<25%) due to a large band gap. Upon UV, solar and vis irradiation, the complete MC-LR degradation (100%) was obtained in the presence of C/N/S co-modified TiO2 with a degradation rate constant of 0.26 min−1, 0.11 min−1 and 0.04 min−1, respectively. It was proposed that the remarkable activity of co-modified TiO2 might originate from its mixed-phase composition, mesoporous structure, and non-metal co-modification. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86394 |
| Appears in Collections: | 触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: Ewa Kowalska
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