2024-03-19T08:07:41Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/995902018-11-15T12:30:26Zcom_10261_84com_10261_5col_10261_337
00925njm 22002777a 4500
dc
Fernández Velasco, Leticia
author
Jiménez Carmona, Rocío
author
Matos, Juan
author
Ovín Ania, María Concepción
author
2014-07
The long term performance of semiconductor-free activated carbons showing photochemical activity was explored by monitoring the photodegradation of phenol from aqueous solution along 20 h of illumination in consecutive photocatalytic cycles. The efficiency of the process was evaluated in terms of phenol conversion, mineralization degree and evaluation of degradation intermediates upon cycling. Data showed a strong dependence of the photooxidation efficiency on the hydrophobic/hydrophilic nature of the carbons. The outstanding role of dissolved oxygen as a promoter of phenol photodegradation through the formation of O-radicals upon illumination of the carbons was also demonstrated. The excess of oxygen not only improved phenol conversion and mineralization, but delayed the clogging of the carbon’s porosity upon cycling. This is important since a fraction of the photooxidation reaction also takes place inside the porous network of the carbon materials. Overall, the performance of the activated carbons, especially in conditions of excess of oxygen, is comparable to that of commercial titania.
Carbon 73: 206-215 (2014)
0008-6223
http://hdl.handle.net/10261/99590
10.1016/j.carbon.2014.02.056
Phenol
Activated carbons
Performance of activated carbons in consecutive phenol photooxidation cycles