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| Content Provider | Springer Nature Link |
|---|---|
| Author | Silva, M. I. Burrows, H. D. Formosinho, S. J. Alves, L. Godinho, A. Antunes, M. J. Ferreira, D. |
| Copyright Year | 2007 |
| Abstract | Advanced oxidation processes, such as photocatalysed oxidation, provide an important route for degradation of wastes. In this study, the lowest excited state (3MLCT) of Ru(bpy) 3 2+ is used to break down chlorophenol pollutant molecules to harmless products. This has the advantage of using visible light and a short-lived catalytically active species. Photolysis of deaerated aqueous solutions of a variety of mono- and poly-substituted chlorophenols has been followed in the presence of Ru(bpy) 3 2+ /S2O 8 2− with near visible light (λ > 350 nm) by UV/visible absorption spectroscopy, luminescence, potentiometry, NMR and HPLC techniques. Upon irradiation, a decrease is observed in the chlorophenol concentration, accompanied by the formation of Cl−, H+ and SO 4 2− ions as the main inorganic products. Benzoquinone, phenol, dihydroxybenzenes and chlorinated compounds were the dominant organic products. As the ruthenium(II) complex is regenerated in the reaction, the scheme corresponds to an overall catalytic process. The kinetics of the rapid chlorophenol photodechlorination has been studied, and are described quite well by pseudo-first order behaviour. Further studies on this were made by following Cl− release with respect to the initial Ru(bpy) 3 2+ and S2O 8 2− concentrations. A comparison is presented of the photodechlorination reactivity of the mono and polychlorophenols studied at acidic and alkaline pH. |
| Starting Page | 143 |
| Ending Page | 149 |
| Page Count | 7 |
| File Format | |
| ISSN | 16103653 |
| Journal | Environmental Chemistry Letters |
| Volume Number | 5 |
| Issue Number | 3 |
| e-ISSN | 16103661 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2007-03-21 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Photolysis Ru(bpy) 3 2+ Photodegradation/photodechlorination Chlorophenols Kinetics Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Soil Science & Conservation Monitoring/Environmental Analysis/Environmental Ecotoxicology Biochemistry Analytical Chemistry Geochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry |
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