| Title | Photocatalytic decomposition of cortisone acetate in aqueous solution. |
| Publication Type | Journal Article |
| Year of Publication | 2015 |
| Journal | Journal of Hazardous Materials |
| Volume | 282 |
| Pagination | 208 - 215 |
| Authors | Romao, Joana Sobral, Mohamed S. Hamdy, Guido Mul, and Jonas. Baltrusaitis |
| Publisher | Elsevier B.V. |
| ISBN Number | 0304-3894 |
| Keywords | photocatalysis decompn cortisone acetate wastewater |
| Abstract | The photocatalytic decompn. of cortisone 21-acetate (CA), a model compd. for the commonly used steroid, cortisone, was studied. CA was photocatalytically decompd. in a slurry reactor with the initial rates 0.11-0.46 mg/L-min at 10 mg/L concn., using the following heterogeneous photocatalysts in decreasing order of their catalytic activity: ZnO > Evonik TiO2 P25 > Hombikat TiO2 > WO3. Due to the lack of ZnO stability in aq. solns., TiO2 P25 was chosen for further expts. The decompn. reaction was found to be pseudo-1st order and the rate const. decreased as a function of increasing initial CA concn. Changing the initial pH of the CA soln. did not affect the reaction rate significantly. The decompn. reaction in the presence of the oxidizing sacrificial agent Na persulfate showed an obsd. decompn. rate const. of 0.004/min, lower than that obtained for TiO2 P25 (0.040/min). The highest photocatalytic degrdn. rate const. was obtained combining both TiO2 P25 and S2O82- (0.071/min) showing a synergistic effect. No reactive intermediates were detected using LC-MS showing fast photocatalytic decompn. kinetics of CA. [on SciFinder(R)] |