Photocatalytic studies of Zn-doped and (Y, Zn)-co-doped CeO2/CdS heterostructures for the removal of crystal violet dye

Punit Kumar Sharma, O. P. Pandey

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In the present work, CdS heterostructures are successfully synthesized with Zn-doped and (Y, Zn)-co-doped CeO2 via co-precipitation route using different molar concentrations of sodium sulfide. The synthesized samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy to study their structural, morphological, and elemental composition, respectively. XRD results confirmed the cubic phase for CeO2 and wurtzite structure for CdS with average crystallite size in the range of 3–5 nm. The crystallite size of CdS heterostructures with (Y, Zn)-co-doped CeO2 sample is found to be slightly larger than Zn-doped CeO2. The different modes of vibrations are observed in Raman spectra. The absorbance spectra and calculated band gap exhibited the formation of UV–visible active compound. TEM image depicted the formation of agglomerated nanoparticles (NPs) with irregular shapes. The photoluminescence spectra exhibited the charge recombination in synthesized samples. XRD, FTIR, UV, PL, and Raman techniques confirmed the formation of CdS in the synthesized heterostructures. Further, chemical composition and valence state of different elements were confirmed from XPS spectra. The photocatalytic activity was studied via UV–visible spectroscopy technique by examining the absorbance spectra using crystal violet dye. The present work elucidates the photocatalytic activity of CdS heterostructures synthesized with undoped, Zn-doped, and (Y, Zn)-co-doped CeO2 samples. Among the various samples, CdS heterostructures which were synthesized using Zn-doped CeO2 exhibited the quick removal of CV dye within 2 h under UV–visible illumination. The role of oxygen vacancies in alerting the photocatalytic activity of CdS heterostructures with doped and co-doped CeO2 NPs Zn-doped and (Y, Zn)-co-doped CeO2/CdS heterostructures for the removal of crystal violet dye has been studied in detail.

Original languageEnglish
Pages (from-to)11281-11307
Number of pages27
JournalJournal of Materials Science: Materials in Electronics
Volume33
Issue number14
DOIs
StatePublished - May 2022
Externally publishedYes

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