期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 279, 期 -, 页码 17-25出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.06.040
关键词
Photodegradation; 17 alpha-Ethinylestradiol; TiO2-doped zeolite; UV; Hydroxyl radical
资金
- USGS-WRRI [G11AP20083]
- National Science Foundation [CHE-1126657]
- China Scholarship Council
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1126657] Funding Source: National Science Foundation
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, 17 alpha-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 basad 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. (C) 2014 Elsevier B.V. All rights reserved.
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