Photobleaching-induced changes in photosensitizing properties of dissolved organic matter
Photosensitizing properties of different dissolved organic matter (DOM) were investigated according to their performance in singlet oxygen (1O2), triplet state of DOM (3DOM*), and hydroxyl radical (·OH) productions. The photobleaching of DOM solutions after irradiation was characterized by fluoresce...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
IWA Publishing
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/50002 |
| _version_ | 1848758370461286400 |
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| author | Niu, X. Liu, C. Gutierrez, L. Croué, Jean-Philippe |
| author_facet | Niu, X. Liu, C. Gutierrez, L. Croué, Jean-Philippe |
| author_sort | Niu, X. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Photosensitizing properties of different dissolved organic matter (DOM) were investigated according to their performance in singlet oxygen (1O2), triplet state of DOM (3DOM*), and hydroxyl radical (·OH) productions. The photobleaching of DOM solutions after irradiation was characterized by fluorescence excitation-emission matrix and UV-Vis spectroscopy. The photosensitizing properties of pre-irradiated DOM solutions were changed in a sunlight simulator. The performance of DOMs in photosensitized degradation of several contaminants was investigated. For a 20h exposure, the observed degradation rate constant (kobs) of some contaminants decreased as a function of exposure time, and highly depended on the properties of both DOM and contaminant. Degradation of contaminants with lower kobs was more susceptible to DOM photobleaching-induced decrease in kobs. Under the current experimental conditions, the photobleaching-induced decrease of DOM photo-reactivity in contaminant degradation was mainly attributed to indirect phototransformation of DOM caused by the interactions between photo-inductive DOM moieties and photochemically-produced reactive species. Reactive contaminants can inhibit DOM indirect photobleaching by scavenging reactive species, photosensitized degradation of these contaminants exhibited a stable kobs as a result. This is the first study to report DOM photobleaching-induced changes in the simultaneous DOM photosensitized degradation of contaminants and the inhibitory effect of reactive contaminants on DOM photobleaching. |
| first_indexed | 2025-11-14T09:42:55Z |
| format | Journal Article |
| id | curtin-20.500.11937-50002 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:42:55Z |
| publishDate | 2014 |
| publisher | IWA Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-500022017-09-13T15:40:42Z Photobleaching-induced changes in photosensitizing properties of dissolved organic matter Niu, X. Liu, C. Gutierrez, L. Croué, Jean-Philippe Photosensitizing properties of different dissolved organic matter (DOM) were investigated according to their performance in singlet oxygen (1O2), triplet state of DOM (3DOM*), and hydroxyl radical (·OH) productions. The photobleaching of DOM solutions after irradiation was characterized by fluorescence excitation-emission matrix and UV-Vis spectroscopy. The photosensitizing properties of pre-irradiated DOM solutions were changed in a sunlight simulator. The performance of DOMs in photosensitized degradation of several contaminants was investigated. For a 20h exposure, the observed degradation rate constant (kobs) of some contaminants decreased as a function of exposure time, and highly depended on the properties of both DOM and contaminant. Degradation of contaminants with lower kobs was more susceptible to DOM photobleaching-induced decrease in kobs. Under the current experimental conditions, the photobleaching-induced decrease of DOM photo-reactivity in contaminant degradation was mainly attributed to indirect phototransformation of DOM caused by the interactions between photo-inductive DOM moieties and photochemically-produced reactive species. Reactive contaminants can inhibit DOM indirect photobleaching by scavenging reactive species, photosensitized degradation of these contaminants exhibited a stable kobs as a result. This is the first study to report DOM photobleaching-induced changes in the simultaneous DOM photosensitized degradation of contaminants and the inhibitory effect of reactive contaminants on DOM photobleaching. 2014 Journal Article http://hdl.handle.net/20.500.11937/50002 10.1016/j.watres.2014.08.017 IWA Publishing restricted |
| spellingShingle | Niu, X. Liu, C. Gutierrez, L. Croué, Jean-Philippe Photobleaching-induced changes in photosensitizing properties of dissolved organic matter |
| title | Photobleaching-induced changes in photosensitizing properties of dissolved organic matter |
| title_full | Photobleaching-induced changes in photosensitizing properties of dissolved organic matter |
| title_fullStr | Photobleaching-induced changes in photosensitizing properties of dissolved organic matter |
| title_full_unstemmed | Photobleaching-induced changes in photosensitizing properties of dissolved organic matter |
| title_short | Photobleaching-induced changes in photosensitizing properties of dissolved organic matter |
| title_sort | photobleaching-induced changes in photosensitizing properties of dissolved organic matter |
| url | http://hdl.handle.net/20.500.11937/50002 |