Superior photocatalytic activity of tungsten disulfide nanostructures: role of morphology and defects
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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.
KeywordsWS2 nanostructures Photocatalysis High-performance liquid chromatography Photoluminescence Raman
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.
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Conflict of interest
There are no conflicts of interest to declare.
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