In this work, facile and low cost electrodeposition method has been used to prepare bismuth vanadate (BiVO4) thin films on fluorine-doped tin oxide glass in order to study photoelectrochemical water splitting performance.Variations of the electrodeposition time remarkably changed the photoelectrochemical properties of the films. The impact of etching time on the surface morphology, crystallinity, light absorption, and the photoelectrochemical characteristics of BiVO4 thin films prepared by electrodeposition method has been studied to remove excess V2O5 on top of BiVO4. Excess V2O5 was then removed by chemical etching in an aqueous KOH solution. The photocurrent density of the BiVO4 film etched for 20 min 8 times higher than the corresponding value for BiVO4 film prior to etching. Next, Co(OH)2 and CuO deposited BiVO4 photocatalysts were synthesized by electron deposition technique as a versatile and cost-effective method. In this project has been used XRD, UV-vis DRS, XPS, FESEM and TEM were used to identify prepared photoanodes. The results showed that the density current of Co(OH)2-BiVO4 and CuO-BiVO4 photoanodes is approximately 8 times higher than pure BiVO4 film.Oxidative desulfurization was eva‎luated by photocatalytic, electrocatalytic and photoelectrocatalytic methods. In addition, the effects of reaction time, DBT and H2O2 concentrations, temperature and different electrical biases on the desulfurization rate were investigated by photocatalytic oxidation desulfurization experiments. Under optimum conditions, the removal of DBT from Co(OH)2-BiVO4 and CuO-BiVO4 nanosheetsreached up to 69% and 73% for optical conditions respectively. and for photoelectrocatalytic conditions (simultaneous application of light and potential) it was more than 78 and 80%. These catalysts catalyst recycled 6 times without significant decrease of catalytic activity. Co(OH)2-BiVO4 and CuO-BiVO4 nanoflake can be a promising new photoanode for the treatment of wastewaters contaminated with sulfur-containing organic pollutants.

محمدمحسن مومني هامانه

عليرضا نجفي

حسين فرخ پور، محمد ژياني، اسماعيل حيدري، مسعود فرجي