Synthesis and Photocatalytic Properties of Ag/BiOCl Compound Nanofilms
BiOCl granular film was crystallized on indium tin oxide (ITO) substrates via a simple sol-gel dip-coating technique firstly. Then a bit of Ag was loaded on BiOCl surface by a direct current magnetron sputtering system, and the Ag/BiOCl compound nano-film was got. Photocatalytic activity was evaluated by photocatalytic degradation of Rhodamine B under UV illumination of diverse compound nanofilms which were obtained by varying sputtering time, sputtering pressure and annealing temperature. The experiments demonstrated that the suitable amount of Ag loading could enhance the photocatalytic activity of BiOCl film. When the sputtering pressure was 1 Pa, sputtering time was 1 s, anneal temperature was 200 t and annealing time was 1 h, the film had the best photocatalytic property. These photocatalysts were characterized by X-ray diffraction, scanning electron microscopy, UV-Vis spectrum. Furthermore, the probable reasons for the increase photocatalytic activity of the BiOCl film by loading suitable amount of Ag was discussed. Because of the formation of Schottky barrier by impurities level, it could capture the electrons to promote the separation of electron-hole pair, and at the same time benefit to the redistribution of photo-generated carriers.
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