Degradation of rhodamine B photocatalyzed by Eu-doped CdS nanowires illuminated by visible radiation |
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Authors: | Anukorn Phuruangrat Siwat Thungprasert Thawatchai Sakhon Budsabong Kuntalue Titipun Thongtem Somchai Thongtem |
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Institution: | 1. Division of Physical Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand;2. Department of Chemistry and Applied Chemistry, Faculty of Science, Lampang Rajabhat University, Lampang, 52100, Thailand;3. Electron Microscopy Research and Service Center, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand;4. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand;5. Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand;6. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand |
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Abstract: | CdS nanowires doped with different contents of Eu dopant were synthesized by solvothermal method. XRD, SEM, TEM and Raman analyses certified that the as-synthesized samples were hexagonal CdS uniform nanowires. The pure CdS nanowires were 1–3 ?μm long and 80 ?nm diameter with the 1st and 2nd order longitudinal phonon modes at 298 and 594 ?cm?1. The 3% Eu-doped CdS wires were 800 ?nm–2.5 ?μm long and 75 ?nm diameter with the 1st and 2nd order longitudinal phonon modes at 296 and 593 ?cm?1. CdS nanowires grew along the 001] direction due to the surface energy effect. The photocatalytic properties of CdS and Eu-doped CdS nanowires were investigated for the degradation of rhodamine B (RhB) illuminated by visible radiation. In this research, Eu dopant played the role in promoting the photocatalytic kinetics because Eu3+ ions act as an electron acceptor to promote charge separation and photocatalytic activity. Both ●OH and ●O2? were the main active radicals used to transform RhB molecules into CO2, H2O and other intermediates. |
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Keywords: | Eu-doped CdS nanowires Photocatalysis Active radicals |
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