In the present study, WO3 nanoparticles (NPs) synthesised via starch-assisted co-precipitation approach and crystal violet (CV) dye was selected as a model pollutant to examine the photocatalytic efficiency of synthesised samples. The XRD of samples verified monoclinic phase with a crystallite size of 24 and 32 nm for starch-assisted WO3 (WS1) and without starch WO3 (WS0) NPs, respectively. SEM and FESEM analysed the morphology of synthesised samples and the average particle size of 108 nm is obtained for WS1. The bandgap value of WS1 has been calculated to be about 2.69 eV. According to obtained result, about 97% of CV dye degrades in the presence of WS1 under sunlight after 150 min with a rate constant of 0.01532 min−1.
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