Abstract
This work illustrates an enhanced visible light photocatalytic degradation of methyl orange dye (M.O.) by employing BiOI / BiOCl composites prepared under room temperature and without any organic precursors. Various experimental parameters have been studied, namely; composition of the composite, irradiation time and cell material. Composition D which implied 75% BiOI and 25% BiOCl has shown the highest bleaching of M.O. dye. This confirms the optimum photo-sensitization phenomenon for this composition in comparison to others. In the optimum photo-sensitized composite the electron of the conduction band reveals better reducing power and the hole of the valence band exhibits more oxidative power than those of pure BiOI electron and hole. Accordingly, under appropriate experimental conditions, methyl orange was significantly bleached using composite D.
Highlights
Bismuth oxyhalides (BiOX (X =Cl, Br, I)) are another type of semiconductors that have been studied as potential candidates for photocatalytic applications in catalysis and pollution control]1[
V1 = Volume taken from irradiated solution (1 ml) t = Irradiation time in second NA = Avogadro‘s number d = Light path of the cuvette (1 cm) The cell was irradiated in the same position used for irradiated samples (Image 1)
Photocatalytic activity of synthesized A, B, C, D and E composites have been studied through the bleaching of M.O. solutions under irradiation conditions for two or seven minutes and twelve centimeters distance of the pyrex glass contained sample from the 1000 watt high pressure Hg lamp as illumination source
Summary
Br, I)) are another type of semiconductors that have been studied as potential candidates for photocatalytic applications in catalysis and pollution control]1[. In view of the fact that the unique properties of nanomaterials are structure dependent, scientists have paid much attention to the controllable and successful synthesis of BiOCl nanotubes, nanoplates , nanosheets and nanoflowers that are nanosized and of a particular morphology by means of hydrothermal and/or solvothermal treatment at 160–180 °C for 10–24 h [4]. Huizhong and his collaborators [5]. BiOX (X = Cl, Br, and I) by hydrolysis reaction Their photocatalytic activities were evaluated by the photodecomposition of rhodamine B under visible light irradiation. We report the synthesis of BiOI / BiOCl composites from inorganic precursors (KI, KCl and Bismuthoxy nitrate) and its application in the bleaching of M.O
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