Photoactive polymer–nanoclay hybrid photosensitizer for oxidation of phenol in aqueous media with the visible light
| Autor: | Mariusz Kepczynski, Dominik Drozd, Maria Nowakowska, Marta Kumorek, Krzysztof Szczubiałka |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Aqueous solution
photosensitizer Singlet oxygen General Chemical Engineering Intercalation (chemistry) General Physics and Astronomy Quantum yield General Chemistry Chromophore Photochemistry PEG Porphyrin singlet oxygen chemistry.chemical_compound chemistry phenol Photosensitizer nanoclayn porphyrin Visible spectrum |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry. 288:39-45 |
| ISSN: | 1010-6030 |
| DOI: | 10.1016/j.jphotochem.2014.04.025 |
| Popis: | The intercalation of a photoactive polymer, polyethylene glycol (PEG 2000 ) containing covalently attached 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin chromophores (p-THPP), in Cloisite ® 30B (C30B) resulted in formation of a hybrid photosensitizer C30B/p-THPP-PEG 2000 . The photosensitizer acts as an efficient generator of singlet oxygen in aqueous medium on irradiation with visible light. Structural and photophysical properties of C30B/p-THPP-PEG 2000 were determined using complementary physicochemical techniques: X-ray diffraction, laser scanning fluorescence confocal microscopy, and electronic absorption/emission spectroscopies. The C30B/p-THPP-PEG 2000 was found to act as an efficient photosensitizer for oxidation of phenol in aqueous solution under irradiation with light at λ > 470 nm. The mechanism and the quantum yield of that process were shown to be strongly pH dependent. The pH effect on acid–base equilibria of porphyrin associated with imine N-protonation as well as the ionization of the phenol molecule were evaluated. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect