Photosensitized degradation of dinitrosalicylic acid by uranyl ions
The photodegradation of dinitrosalicylic acid (DNS) by photoexcited uranyl ion was studied in aqueous solutions. The failure of DNS to degrade directly with light highlights the importance of the photoexcited uranyl ion in controlling the photochemical processes. Fluorescence quenching studies showe...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2003-01-01
|
| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X03000357 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850174126987149312 |
|---|---|
| author | A. A. I. Essawy M. S. A. Abdel-Mottaleb |
| author_facet | A. A. I. Essawy M. S. A. Abdel-Mottaleb |
| author_sort | A. A. I. Essawy |
| collection | DOAJ |
| description | The photodegradation of dinitrosalicylic acid (DNS) by photoexcited uranyl ion was studied
in aqueous solutions. The failure of DNS to degrade directly with light highlights the importance of the
photoexcited uranyl ion in controlling the photochemical processes. Fluorescence quenching studies showed
that an electron-transfer process from the DNS to the excited uranyl ion is involved leading to the formation
of UO2+/DNS•+ radical pair complex as an initial step. Illumination of the UO22+/DNS solution in presence
of oxygen results in mineralization of DNS. The results are explained on the basis of a catalytic cycle involving UO22+ ion and molecular oxygen that generates reactive superoxide O2•− anion and its conjugate acid HO2•. The efficiency of the photocatalytic cycle is enhanced markedly by addition of dilute NaOH solution. |
| format | Article |
| id | doaj-art-d24c7c9ef30b46a6bf3313af51b6e1f3 |
| institution | OA Journals |
| issn | 1110-662X |
| language | English |
| publishDate | 2003-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-d24c7c9ef30b46a6bf3313af51b6e1f32025-08-20T02:19:43ZengWileyInternational Journal of Photoenergy1110-662X2003-01-015421922110.1155/S1110662X03000357Photosensitized degradation of dinitrosalicylic acid by uranyl ionsA. A. I. Essawy0M. S. A. Abdel-Mottaleb1Dept. Chem., Faculty of Science, Cairo University, Fayoum Branch, EgyptPhotoenergy Center, Faculty of Science, Ain Shams University, Abbassia, Cairo, EgyptThe photodegradation of dinitrosalicylic acid (DNS) by photoexcited uranyl ion was studied in aqueous solutions. The failure of DNS to degrade directly with light highlights the importance of the photoexcited uranyl ion in controlling the photochemical processes. Fluorescence quenching studies showed that an electron-transfer process from the DNS to the excited uranyl ion is involved leading to the formation of UO2+/DNS•+ radical pair complex as an initial step. Illumination of the UO22+/DNS solution in presence of oxygen results in mineralization of DNS. The results are explained on the basis of a catalytic cycle involving UO22+ ion and molecular oxygen that generates reactive superoxide O2•− anion and its conjugate acid HO2•. The efficiency of the photocatalytic cycle is enhanced markedly by addition of dilute NaOH solution.http://dx.doi.org/10.1155/S1110662X03000357 |
| spellingShingle | A. A. I. Essawy M. S. A. Abdel-Mottaleb Photosensitized degradation of dinitrosalicylic acid by uranyl ions International Journal of Photoenergy |
| title | Photosensitized degradation of dinitrosalicylic acid by uranyl ions |
| title_full | Photosensitized degradation of dinitrosalicylic acid by uranyl ions |
| title_fullStr | Photosensitized degradation of dinitrosalicylic acid by uranyl ions |
| title_full_unstemmed | Photosensitized degradation of dinitrosalicylic acid by uranyl ions |
| title_short | Photosensitized degradation of dinitrosalicylic acid by uranyl ions |
| title_sort | photosensitized degradation of dinitrosalicylic acid by uranyl ions |
| url | http://dx.doi.org/10.1155/S1110662X03000357 |
| work_keys_str_mv | AT aaiessawy photosensitizeddegradationofdinitrosalicylicacidbyuranylions AT msaabdelmottaleb photosensitizeddegradationofdinitrosalicylicacidbyuranylions |