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https://hdl.handle.net/10316/10726
Title: | Photooxidation of 4-chlorophenol sensitised by iron meso-tetrakis(2,6-dichloro-3-sulfophenyl)porphyrin in aqueous solution | Authors: | Silva, Eliana Pereira, Mariette M. Burrows, Hugh D. Azenha, M. E. Sarakha, Mohamed Bolte, Michèle |
Issue Date: | 25-Nov-2003 | Publisher: | Royal Society of Chemistry | Citation: | Photochemical & Photobiological Sciences. 3 (2004) 200-204 | Abstract: | The photosensitised degradation of 4-chlorophenol (4-CP) by iron meso-tetrakis(2,6-dichloro-3-sulfophenyl)porphyrin (FeTDCPPS) has been studied in aerated aqueous solution, and is shown to lead to formation of p-benzoquinone (BQ) and p-hydroquinone (HQ) as main photoproducts. In deaerated solution no p-benzoquinone was formed. The photolysis products were identified by high performance liquid chromatography (HPLC) and UV-visible spectroscopy. The photodegradation in aerated solution was also carried out in the presence of sodium azide (NaN3) as a singlet oxygen [1O2(1g)] quencher, and showed a significant decrease in the rate of photolysis, suggesting under these conditions, that Type II sensitisation is one of the dominant mechanisms of 4-CP degradation. Support for this comes from laser flash photolysis and time-resolved singlet oxygen phosphorescence measurements. However, these also show direct reaction between the excited porphyrin and 4-CP, indicating that there are two mechanisms involved in the chlorophenol photodegradation. | URI: | https://hdl.handle.net/10316/10726 | ISSN: | 1474-905X | DOI: | 10.1039/b308975d | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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Photooxidation of 4-chlorophenol sensitised by iron.pdf | 133.37 kB | Adobe PDF | View/Open |
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