Please use this identifier to cite or link to this item: http://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: http://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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