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

Tungsten disulphide (WS 2 ) nanostructures, WS 2 nanosheets (W NS ) and WS 2 nanorods (W NR ), 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 transmissio...

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Bibliographic Details
Published in:Applied nanoscience 2019-10, Vol.9 (7), p.1515-1529
Main Authors: Ashraf, Waseem, Fatima, Tarab, Srivastava, Ketki, Khanuja, Manika
Format: Article
Language:English
Subjects:
Ammonium bromides
Catalytic activity
Cetyltrimethylammonium bromide
Chemistry and Materials Science
Chlorophenol
Comparative studies
Crystal defects
Crystal structure
Density
Field emission microscopy
Fourier transforms
Functional groups
High performance liquid chromatography
Materials Science
Membrane Biology
Methylene blue
Microscopy
Morphology
Nanochemistry
Nanorods
Nanostructure
Nanotechnology
Nanotechnology and Microengineering
Original Article
Photocatalysis
Photodegradation
Photoluminescence
Pore size
Porosity
Scanning electron microscopy
Transmission electron microscopy
Tungsten disulfide
X-ray diffraction
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Summary:Tungsten disulphide (WS 2 ) nanostructures, WS 2 nanosheets (W NS ) and WS 2 nanorods (W NR ), 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 WS 2 nanostructures (W NS and W NR ) 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 W NS over W NR 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.
ISSN:2190-5509
2190-5517
DOI:10.1007/s13204-019-00951-4