Effect of Zr doping and aging on optical and photocatalytic properties of ZnS nanopowder

Jayanti Sharma, Aayush Gupta, O. P. Pandey

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

A facile single step chemical method is reported for the synthesis of Zr doped ZnS nanopowder and its photocatalytic performance has been studied. The average crystallite size of the synthesized powder estimated from X-ray diffraction (XRD) is nearly 1.1 nm. Transmission electron microscopy (TEM) study shows that nanoparticles are agglomerated having a particle size of nearly 10 nm. The optical band gap of ZnS and Zr-doped ZnS, estimated with the help of UV–visible spectroscopy, is 3.7 and 2.9 eV, respectively. Photoluminescence (PL) spectroscopy indicated the role of lattice defects (vacancy, interstitial defects) on optical emission characteristics of doped ZnS samples. The photocatalytic activity of synthesized samples has also been investigated by degrading methylene blue (MB) dye under UV–visible illumination. The degradation quenching has been observed beyond 0.4 mol% doping of Zr in ZnS with maximum efficiency i.e. 80% in 4 h. Thereafter, the effect of aging is monitored for 1.5 months in which the modified emission properties of defect sites modulated the photocatalytic performance of Zr-doped ZnS sample. Further, with the help of various spectroscopic techniques (absorbance, PL and XPS), a mechanism for the photodegradation of MB dye by using Zr-doped ZnS nanopowder has been proposed.

Original languageEnglish
Pages (from-to)13671-13678
Number of pages8
JournalCeramics International
Volume45
Issue number11
DOIs
StatePublished - 1 Aug 2019
Externally publishedYes

Keywords

  • Degradation mechanism
  • Luminescence
  • Methylene blue
  • Photocatalysis
  • Zr doped ZnS

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