Performance of calcium peroxide (CaO2) in removing glucocorticoid (GC) contamination was investigated with triamcinolone acetonide (TA) as the representative target compound. An experimental design based on the response surface methodology (RSM) was applied to assess the individual and interaction effects of several operating parameters (CaO2 dosage, initial pH value, reaction time, and TA concentration) on TAremoval. Based on the results of RSM, the optimal conditions were obtained as follows:CaO2 dosage at 4g/L, initial pH=5.7, reaction time=15.7 min, and initial TA concentration=0.06 mmol/L. Moreover, additional experimental result obtained under optimal conditions (82.8%) was found to be very close to the predicted value (88.6%). These results indicated that the response model could be an effective method to describe the removal of GC by CaO2. Finally, the role of reactive oxygen species (ROS) in GC degradation was tested by electron paramagnetic resonance spectroscopy (EPR). This study contributes significantly to the improvement and better understanding of CaO2 oxidation and GC treatment processes.
Liu S, Ying G G, Zhao J L, et al. Trace analysis of 28steroids in surface water, wastewater and sludge samples by rapid resolution liquid chromatography-electrospray ionization tandem mass spectrometry[J]. Journal of Chromatography A, 2011,1218(10):1367-1378.
Schriks M, van Leerdam J A, van der Linden S C, et al. High-resolution mass spectrometric identification and quantification of glucocorticoid compounds in various wastewaters in the Netherlands[J]. Environmental Science & Technology, 2010,44:4766-4774.
Navarro-Castilla A, Barja I, Olea P P, et al. Are degraded habitats from agricultural crops associated with elevated faecal glucocorticoids in a wild population of common vole (Microtus arvalis)[J]. Mammalian Biology, 2014,79(1):36-43.
Jia A, Wu S M, Daniels K D, et al. Balancing the budget:accounting for glucocorticoid bioactivity and fate during water treatment[J]. Environmental Science & Technology, 2016,50:2870-2880.
Northup A., Cassidy D. Calcium peroxide (CaO2) for use in modified Fenton chemistry[J]. Journal of Hazardous Materials, 2008,152:1164-1170.
Khataee A R, Zarei M, Moradkhannejhad L. Application of response surface methodology for optimization of azo dye removal by oxalate catalyzed photoelectro-Fenton process using carbon nanotube-PTFE cathode[J]. Desalination, 2010,258(1-3):112-119.
Cruz-González K, Torres-Lopez O, García-León A M, et al. Optimization of electro-Fenton/BDD process for decolorization of a model azo dye wastewater by means of response surface methodology[J]. Desalination, 2011,286(1):63-68.
Vargas A, Martins A C, Almeida V C. Ternary adsorption of acid dyes onto activated carbon from flamboyant pods (Delonix regia):Analysis by derivative spectrophotometry and response surface methodology[J]. Chemical Engineering Journal, 2012,195:173-179.
Tripathi P, Srivastava V C, Kumar A. Optimization of an azo dye batch adsorption parameters using Box-Behnken design[J]. Desalination, 2009,249(3):1273-1279.
Ramírez C, Saldaña A, Hernández B, et al. Electrochemical oxidation of methyl orange azo dye at pilot flow plant using BDD technology[J]. Journal of Industrial & Engineering Chemistry, 2013,19(2):571-579.
Korbahti B K, Rauf M A. Response surface methodology (RSM) analysis of photoinduced decoloration of toludine blue[J]. Chemical Engineering Journal, 2008,136(1):25-30.
Sleiman M, Vildozo D, Ferronato C, et al. Photocatalytic degradation of azo dye Metanil Yellow:Optimization and kinetic modeling using a chemometric approach[J]. Applied Catalysis B-Environmental, 2007,77(1/2):1-11.
Zhang A, Wang J, Li Y. Performance of calcium peroxide for removal of endocrine-disrupting compounds in waste activated sludge and promotion of sludge solubilization[J]. Water Research, 2015,71:125-139.
Qian Y, Zhou X, Zhang Y, et al. Performance and properties of nanoscale calcium peroxide for toluene removal[J]. Chemosphere, 2013,91:717-723.
Zhang X, Gu X, Lu S, et al. Degradation of trichloroethylene in aqueous solution by calcium peroxide activated with ferrous ion[J]. Journal of Hazardous Materials, 2015,284:253-260.
Dvoranova D, Brezova V, Mazur M, et al. Investigations of metal-doped titanium dioxide photocatalysts[J]. Applied Catalysis B-Environmental, 2002,37:91-105.