Improved photocatalytic performance of flower-like BiOBr/BiOCl heterojunctions prepared by an ionic liquid assisted one-step hydrothermal method

摘要

Construction of heterojunctions is a promising and solid strategy to tune the photocatalytic performance of BiOCI. In this work, flower-like BiOBr/BiOCl heterojunctions (IL-BiOCl) was in situ prepared by N-ethylpyridinium bromide ([BPy]Br) assisted one-step hydrothermal method. The samples were studied by a serials method. The results exhibit that [BPy]Br promotes the specific surface area and the separation rate of photoinduced carriers. Energy dispersive spectrometer (EDS) and high resolution transmission electron microscopy (HRTEM) results firmly reveal that BiOBr/BiOCl heterojunctions were successfully constructed. [BPy]Br provides Br source for BiOBr and influences the shape of the IL-BiOCl. Photocatalytic activity of the samples were evaluated, the results reveal that IL-BiOCl possesses higher photocatalytic activity than BiOCl toward decomposition of rhodamine B (RhB) under simulated sunlight irradiation. (C) 2018 Elsevier B.V. All rights reserved.