Advancements on Basic Working Principles of Photo-Driven Oxidative Degradation of Organic Substrates over Pristine and Noble Metal-Modified TiO2. Model Case of Phenol Photo Oxidation
| العنوان: | Advancements on Basic Working Principles of Photo-Driven Oxidative Degradation of Organic Substrates over Pristine and Noble Metal-Modified TiO2. Model Case of Phenol Photo Oxidation |
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| المؤلفون: | Tanta Spataru, Anca Vasile, Claudiu Fleaca, Valentin S. Teodorescu, Nicolae Spătaru, Florica Papa, C. N. Mihailescu, Crina Anastasescu, Alexandra Sandulescu, Maria Zaharescu, M. Scarisoreanu, Ioan Balint, Monica Raciulete |
| المصدر: | Catalysts, Vol 11, Iss 487, p 487 (2021) Catalysts Volume 11 Issue 4 |
| بيانات النشر: | MDPI AG, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Radical, 02 engineering and technology, engineering.material, 010402 general chemistry, Electrochemistry, Photochemistry, lcsh:Chemical technology, 01 natural sciences, Catalysis, lcsh:Chemistry, chemistry.chemical_compound, TiO2 modified with noble metals, charge recombination, photocatalytic mineralization, Phenol, lcsh:TP1-1185, Physical and Theoretical Chemistry, reactive oxygen species, Quenching (fluorescence), Hydroquinone, Chemistry, surface photovoltage, 021001 nanoscience & nanotechnology, Benzoquinone, O2 photo reduction, 0104 chemical sciences, lcsh:QD1-999, photocatalytic mild oxidation, engineering, Noble metal, phenol oxidation, 0210 nano-technology |
| الوصف: | The specific roles played by both support and noble metals in light absorption, charge separation, and the formation of ·OH and O2− (ROS) are analyzed for light-triggered oxidation of phenol (Ph) over pristine and over noble metal (Ag, Au, Pt) -loaded TiO2. Experiments show that the supported noble metals act as a light visible absorber, assist the separation of photo-charges and reduction of O2 to O2−. The O2− oxidizes mildly Ph to oxygenated products (hydroquinone, benzoquinone, and 1,2-dihydroxibenzene). In a parallel process, ·OH radicals, yielded by TiO2, mineralize Ph to CO2 by fast reaction sequences. Radical quenching and photo electrochemical measurements (surface photovoltage) confirm independently that the production of ·OH and O2− scale with oxidative conversion of Ph. The selectivity to CO2 and mild oxidation products is the result of the interplay between catalyst activity for ·OH and for O2− production. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2073-4344 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95c20965bc2a7fa1bc20e00a13c83c54 https://www.mdpi.com/2073-4344/11/4/487 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....95c20965bc2a7fa1bc20e00a13c83c54 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20734344 |
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