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Superior photocatalytic activity of tungsten disulfide nanostructures: role of morphology and defects

  • Waseem Ashraf
  • Tarab Fatima
  • Ketki Srivastava
  • Manika KhanujaEmail author
Original Article

Abstract

Tungsten disulphide (WS2) nanostructures, WS2 nanosheets (WNS) and WS2 nanorods (WNR), were synthesized by varying the surfactant, N-cetyl-N, N,N-trimethyl ammonium bromide (CTAB), concentration using facile hydrothermal technique. Samples were characterized by high-resolution transmission electron microscopy (HRTEM) and field emission scanning electron microscopy (FESEM) for morphology, X-ray diffraction (XRD) to confirm their phase and crystal structure, photoluminescence (PL) and Raman studies for the determination of defect density, Tauc plot for the determination of band gap, Fourier transform infra red (FTIR) spectroscopy for functional groups and bonds, and Brunauer–Emmett–Teller (BET) isotherms for the determination of pore size and surface area. A comparative study using WS2 nanostructures (WNS and WNR) was conducted to observe the photocatalytic degradation efficiency (ƞ) and degradation kinetics on methylene blue (MB) and 4-chlorophenol (4-CP). The superior photocatalytic performance of WNS over WNR is attributed to enhanced pore size and reduced defect density. High-performance liquid chromatography was carried out for the determination of intermediate products during photocatalytic degradation.

Keywords

WS2 nanostructures Photocatalysis High-performance liquid chromatography Photoluminescence Raman 

Notes

Acknowledgements

The present work was supported to one of the authors (Dr. Manika Khanuja) by Science and Engineering Research Board [SERB (No. ECR/2017/001222)] and University Grant Commission [UGC (No.F.4–5(201 FRP)/2015(BSR))]. The use of characterization facility at Nanoscale Research Facility (NRF), Indian Institute of Technology, New Delhi, is gratefully acknowledged.

Compliance with ethical standards

Conflict of interest

There are no conflicts of interest to declare.

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Copyright information

© King Abdulaziz City for Science and Technology 2019

Authors and Affiliations

  1. 1.Centre for Nanoscience and NanotechnologyJamia Millia IslamiaNew DelhiIndia

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