Abstract
In this study, flower-like BiOBr/BiOCl heterojunction photocatalyst was successfully in-situ constructed by adding a reactable ionic liquid 1-methoxyethyl-3-methylimidazolium bromide ([MOEMIm]Br) into the hydrothermal system. The samples were carefully characterized by specific surface area (BET), X-ray diffraction (XRD), scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), energy-dispersive spectroscopy (EDS), surface photovoltage spectroscopy (SPS), UV–Vis diffuse reflectance spectroscopy (DRS). Electron spin resonance spectroscopy (ESR) and trapping experiments were carried out to identify active free radicals in the reaction system. Using rhodamine B (RhB) as model pollutant, the photocatalytic performance was investigated. The results show that the photoactivity of BiOBr/BiOCl heterojunctions is 5.9 times of that of the bare BiOCl. The boosted photoactivity of BiOBr/BiOCl heterojunctions can be allocated to the relative high separation efficiency of photogenerated carriers owing to the formation of heterojunctions.
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