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Photocatalytic degradation of 17α-ethinylestradiol (EE2) in the presence of TiO2-doped zeolite
Ist Teil von
Journal of hazardous materials, 2014-08, Vol.279, p.17-25
Ort / Verlag
Kidlington: Elsevier B.V
Erscheinungsjahr
2014
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
•We developed a novel low-silica zeolite-TiO2 photocatalyst for EE2 degradation.•The catalyst showed a higher EE2 photodegradation efficiency than unsupported TiO2.•Oxidative degradation pathways initiated by hydroxyl radicals were predominant.
Current design limitations and ineffective remediation techniques in wastewater treatment plants have led to concerns about the prevalence of pharmaceutical and personal care products (PPCPs) in receiving waters. A novel photocatalyst, TiO2-doped low-silica X zeolite (TiO2-LSX), was used to study the degradation of the pharmaceutical compound, 17α-ethinylestradiol (EE2). The catalyst was synthesized and characterized using XRD, BET surface analysis, SEM-EDAX, and ICP-OES. The effects of different UV light intensities, initial EE2 concentrations, and catalyst dosages on the EE2 removal efficiency were studied. A higher EE2 removal efficiency was attained with UV-TiO2-LSX when compared with UV-TiO2 or UV alone. The EE2 degradation process followed pseudo-first-order kinetics. A comprehensive empirical model was developed to describe the EE2 degradation kinetics under different conditions using multiple linear regression analysis. The EE2 degradation mechanism was proposed based on molecular calculations, identification of photoproducts using HPLC–MS/MS, and reactive species quenching experiments; the results showed that oxidative degradation pathways initiated by hydroxyl radicals were predominant. This novel TiO2-doped zeolite system provides a promising application for the UV disinfection process in wastewater treatment plants.