Abstract
Extending solar-light harvesting regions and improving charge separation are contributing to high-performance semiconductor photocatalysis. In this work, ultrathin carbon-coated Fe-TiO2-x nanostructures were prepared via one-pot calcination strategy for tetracycline degradation under visible-light irradiation. The experimental results showed that the carbon-coated Fe-TiO2-x composites displayed remarkably enhanced visible-light harvesting, and the forbidden band width droped to 2.60 eV. In addition, the transient photocurrent responses and electrochemical impedance spectra indicated the highest charge separation and lowest interfacial migration resistance of carbon-coated Fe-TiO2-x-3% composite, and the fluorescence emission spectra and linear sweep voltammetry curves also supported these above findings. The carbon-coated Fe-TiO2-x-3% sample showed the best photocatalytic performance with a rate constant of 0.02512 min−1 towards tetracycline degradation, approximately 3.02 times that of commercial TiO2, mainly attributed to the formation of Fe doping, oxygen vacancies, and relatively high surface areas.
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