Ag@helical chiral TiO2 nanofibers for visible light photocatalytic degradation of 17α-ethinylestradiol
2015
Zhang, Chi | Li, Yi | Wang, Dawei | Zhang, Wenlong | Wang, Qing | Wang, Yuming | Wang, Peifang
Ag-modified helical chiral TiO₂ NFs (Ag@chiral TiO₂ NFs) were fabricated and characterized by ultraviolet-visible absorption spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. This novel material exhibited efficient photocatalytic activity for the degradation of 17α-ethinylestradiol (EE2) in water under visible light irradiation with an optimum size of deposited silver nanoparticles (Ag NPs) in the range of 12 ∼ 14 nm. The pseudo-first-order rate constant (k ₒbₛ) for EE2 photodegradation by Ag@chiral TiO₂ NFs increased by up to a factor of 20.1 when compared with that of pure chiral TiO₂ NFs. The high photocatalytic activity can be attributed to the interactions between helical chiral TiO₂ NFs and surface plasmon resonance effect of Ag NPs. The new catalyst retains its photocatalytic activity at least up to five consecutive cycles. The results clearly demonstrate the feasibility of using Ag@chiral TiO₂ NFs for the photocatalytic removal of EE2 and other endocrine-disrupting chemicals from water.
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