Comparing the Photocatalytic Oxidation Efficiencies of Elemental Mercury Using Metal-Oxide-Modified Titanium Dioxide under the Irradiation of Ultra-Violet Light.
In: Catalysts (2073-4344), Jg. 14 (2024-03-01), Heft 3, S. 209-224
Online
academicJournal
Zugriff:
Since the signing of the Minamata Convention in 2013, attempts have been primarily focused on reducing the emission of elemental mercury (Hg 0 ) from coal-fired power plants (CFPPs). The most cost-effective measure for controlling the emission of mercury involves oxidizing Hg 0 to mercury oxides, which are then removed using wet flue gas desulfurization (WFGD). Thus, novel photocatalysts with the best properties of photocatalytic ability and thermal stability need to be developed urgently. In this study, titanium dioxide (TiO 2 )-based photocatalysts were synthesized through the modification of three metal oxides: CuO, CeO 2 , and Bi 2 O 3 . All the photocatalysts were further characterized using X-ray diffraction, X-ray photoelectron spectroscopy, photoluminescence, and ultraviolet-visible spectrometry. The photocatalytic oxidation efficiencies of Hg 0 were evaluated under an atmosphere of N 2 + Hg 0 at 100–200 °C. The photocatalytic reactions were simulated by kinetic modeling using the Langmuir–Hinshelwood (L–H) mechanism. The results showed that Bi 2 O 3 /TiO 2 exhibited the best thermal stability, with the best oxidation efficiency at 200 °C and almost the same performance at 100 °C. L–H kinetic modeling indicated that photocatalytic oxidation reactions for the tested photocatalysts were predominantly physical adsorption. Additionally, the activation energy (E a ), taking into account Arrhenius Law, decreased dramatically after modification with metal oxides. [ABSTRACT FROM AUTHOR]
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Titel: |
Comparing the Photocatalytic Oxidation Efficiencies of Elemental Mercury Using Metal-Oxide-Modified Titanium Dioxide under the Irradiation of Ultra-Violet Light.
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Autor/in / Beteiligte Person: | Zheng, Ji-Ren ; Yuan, Chung-Shin |
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Zeitschrift: | Catalysts (2073-4344), Jg. 14 (2024-03-01), Heft 3, S. 209-224 |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 2073-4344 (print) |
DOI: | 10.3390/catal14030209 |
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