Catalyst efficiency, photostability and reusability study of ZnO nanoparticles in visible light for dye degradation

摘要: Abstract Polydispersed ZnO nanoparticles (ZnO1000 and ZnO600) with two different windows of particle size distributions (∼120 30 nm) were synthesized using citrate gel route annealing treatments (1000 600 °C, respectively). Photocatalytic efficiency these samples was compared TiO 2 in its commercial form-P25, on dyes, Methylene blue (MB) Methyl orange (MO). The X-ray diffraction data showed wrutzite anatase rutile phases P25. UV–visible absorbance spectra ZnO1000 broad absorption range from UV-to-visible (from 382 to 700 nm), as against sharp peaks UV for both ZnO600 microstructural morphology seen through scanning electron micrographs tetrapod-like structures while the almost spherical morphologies. Upon subjecting catalysts dye solutions sunlight it found that dyes completely decolorised within 20 min by ZnO1000, partial decolorisation P25 ( 53% 78% MO 77% 88% MB samples). effect catalyst loading 125 mg 1 g) had good all concentrations which followed then ZnO600. Small perturbations are attributed competition between scattering-induced, reduced irradiation field exposed surface area offered catalyst, work active sites decolorisation. reusability when studied fresh (4 trials), decreased merely 99.2% 99.12% (53.3% 19.94%) (78.3% 31.42%), indicating efficient ZnO1000. effective half life catalysts, terms number reuses, calculated be ∼3 >3000 justifies extremely high reuse. byproduct analysis (compared standards prescribed World Health Organisation (WHO) Central Pollution Control Board India (CPCB)) cleavage chromophore other bonds opening benzene rings, degradation concurrence decolorisation, stipulated time. Further, cytotoxicity studies performed SiHa cell lines non-toxicity byproducts