首页|Visible light-driven photo remediation of hazardous cationic dye via Ce-doped WO3 nanostructures
Visible light-driven photo remediation of hazardous cationic dye via Ce-doped WO3 nanostructures
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Ce-doped WO3 nanoparticles were successfully synthesized by the sol-gel method and characterized through advanced characterization techniques.The high resolution transmission electron microscopy(HRTEM)and scanning electron microscopy(SEM)results show a reduction in the agglomeration of nanoparticles upon doping.The energy dispersive X-ray(EDX)analysis validates the existence of the Ce element in all the doped samples.X-ray photoelectron spectroscopy(XPS)and Raman spectra justify the presence of structural defects(oxygen vacancies)and successful formation of the monoclinic WO3 phase,respectively.The Kubelka-Munk function indicates a decrease in band gap with doping,while photo-luminescence(PL)spectra show intense visible and UV emissions.Significantly,all doped samples exhibit higher photocatalytic performance than pure WO3 nanoparticles,with the 6 wt％Ce-doped sample displaying the highest degradation rate.Doping with Ce can help to increase the surface area of WO3,thereby improving its photoactivity.Moreover,a correlation between PL and photocatalysis is established in the light of oxygen vacancies suggesting a direct dependence of high photocatalytic activity on strong PL signals of WO3 nanostructures.Trapping experiments further reveal that the degradation process is primarily driven by active species,providing insight into a plausible photocatalytic mechanism.
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