Add time:08/12/2019         Source:sciencedirect.com

Erbium (Er)-doped BiOBr with different Er ions doping concentrations has been synthesized through a solvothermal method in the presence of reactive ionic liquid 1-hexadecyl-3-methylimidazolium bromide ([C16mim]Br). The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform spectrophotometer (FT-IR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and UV–vis diffuse reflectance spectroscopy (DRS). The photocatalytic activities of the Er ions doped BiOBr samples were evaluated by the degradation of ciprofloxacin (CIP) under visible-light irradiation. The results assumed that doping of Er ions over BiOBr led to the increase of the photocatalytic activity under visible light irradiation and 3 wt% Er/BiOBr showed the highest photocatalytic activity. The enhanced photocatalytic performance could be attributed to the improved separation efficiency of electron–hole pairs and reduced band gap.

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