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BACKGROUND CaBi6O10 nanoplates were synthesized by a sonochemical method using a high‐power ultrasonic processor. Also, the CaBi6O10 was synthesized by an impregnation‐calcination method in order to compare the effect of the synthesis method on the photocatalytic activity of the photocatalyst. In addition, the role of the oxidizing species such as h+, OH•, H2O2 and O2•‐ was evaluated during the photocatalytic degradation of ciprofloxacin (CPFX) and methylene blue (MB). RESULTS The sample synthesized sonochemically showed a morphology of nanoplates with a thickness around 50 nm and length 1.5 µm. Also, the sample showed the best photocatalytic activity (i.e. the sample with the highest surface area and a plate‐like morphology), degrading CPFX by 56% and MB by 67%. The main species involved in the degradation of CPFX were the OH· radicals, and in the degradation of MB it was H2O2. CONCLUSIONS CaBi6O10 nanoplates were prepared successfully by a sonochemical method, showing the best photocatalytic activity in the degradation of CPFX and MB, mainly attributed to the morphology of the nanoplates. In addition, it was observed that the main species involved in the degradation of CPFX were the OH· radicals and in the degradation of MB, H2O2. © 2017 Society of Chemical Industry

BACKGROUND: KBiO 3 /g-C 3 N 4 composites were prepared under microwave irradiation to different weight ratios of KBiO 3 (5, 10, 20, 30, 40, 50, 60, 70 80, 90%wt) using a Mars-6 microwave for 30 min at 100 W. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS)-mapping, N 2 physisorption and diffuse reflection spectroscopy (DRS). The photocatalytic activity of the samples was evaluated in the hydrogen evolution reaction. RESULTS:The composites were confirmed by XRD, where it was observed that in samples with up to 60% KBiO 3 it is easy to identify the characteristic peak of g-C 3 N 4 . Composites show that KBiO 3 was homogeneously dispersed on g-C 3 N 4 according to EDS-mapping observations. In the photocatalytic tests it was observed that when the concentration of g-C 3 N 4 was greater than that of KBiO 3 , but up to a certain limit, there was greater production of hydrogen. CONCLUSIONS: KBiO 3 /g-C 3 N 4 composites were prepared successfully with microwave irradiation, reaching a good synergy between both materials for hydrogen production reaction. This synergy was improved by the use of microwaves that facilitate the dispersion and binding of both materials. The sample with best hydrogen production was 40%KBiO 3 /60%C 3 N 4 with 698 mol H 2 g −1 , which is about three times higher than that of g-C 3 N 4 and seven times higher than that of KBiO 3 .

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