Abstract
In this research, ZnO-Bi5O7I and ZnO-Bi2ClHO3 as novel composites for methylene blue photocatalytic degradation as an organic water effluent are synthesized by a simple sono-chemical method. Physicochemical and dynamical properties of the prepared samples are studied by X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray (EDX), Brunauer-Emmet-Teller (BET) surface area, UV–vis Diffuse Reflectance Spectroscopy (DRS) and UV–vis spectrophotometer analyses. Also, pHpzc of the sample with best photocatalytic performance is evaluated for investigation of water acidity effect on photocatalytic performance. Bi2ClHO3 and Bi5O7I are in bismuth oxyhalides category with BiO and Bi5O7 as cationic and OH, Cl and I as anionic layers in these materials structure, respectively. OH− layer in Bi2ClHO3 structure and I− in Bi5O7I act as electron acceptors, which prevent electron-hole pair recombination. Sonication is used in the synthesis procedure for improvement of uniform particle size distribution that affected in samples crystallinity. Improvement of these parameters clearly makes photocatalytic promotion.
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