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ESR spectra of (A) fiber mats (PVDF–PVP, PVDF–PVP–TiO2 2%, and PVDF–PVP–TiO2 5%) in DI water, (B) PVDF–PVP–TiO2 5% with different solutions (DI water, 100 mM NaCl, 100 mM Na2SO4, 100 mM NaNO3, 10 mg/L minocycline (MNC), and 50 mg/L MNC), and (C) PVDF–PVP–TiO2 5% with DI water and 100 mM NaHCO3.
