Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 282, Issue -, Pages 208-215Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.05.087
Keywords
Photocatalysis; Cortisone; Metal oxides; Kinetics
Categories
Funding
- NanoNextNL
Ask authors/readers for more resources
The photocatalytic decomposition of cortisone 21-acetate (CA), a model compound for the commonly used steroid, cortisone, was studied. CA was photocatalytically decomposed in a slurry reactor with the initial rates between 0.11 and 0.46 mg L-1 min(-1) at 10 mg L-1 concentration, 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 aqueous solutions, TiO2 P25 was chosen for further experiments. The decomposition reaction was found to be pseudo-first order and the rate constant decreased as a function of increasing initial CA concentration. Changing the initial pH of the CA solution did not affect the reaction rate significantly. The decomposition reaction in the presence of the oxidizing sacrificial agent sodium persulfate showed an observed decomposition rate constant of 0.004 min(-1), lower than that obtained for TiO2 P25 (0.040 min(-1)). The highest photocatalytic degradation rate constant was obtained combining both TiO2 P25 and S2O82- (0.071 min(-1)) showing a synergistic effect. No reactive intermediates were detected using LC-MS showing fast photocatalytic decomposition kinetics of CA. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available