Abstract
Abstract Pure TiO2 and TiO2-CdS composite nanofibers were synthesized through electrospinning technique. The effects of various levels of CdS loading in a TiO2 nanofibers composite were investigated. Pure TiO2 nanofibers were polycrystalline with an anatase phase, whereas anatase and wurtzite phases coexisted in the TiO2-CdS composite nanofibers, according to X-ray diffraction (XRD) measurements. Using field emission scanning electron microscopy (FESEM) and UV-Visible spectroscopy, the impacts of composite CdS nanoparticles with TiO2 nanofibers were investigated. Pure TiO2 nanofibers have a smooth surface with several microns in length and 21–48 nm in diameter, but when CdS nanoparticles are added, the surface becomes granular. The energy band gap (Eg) evaluated from UV-Visible spectroscopy reduced from a value of 3.70 eV for pure TiO2 nanofibers to 1.70 eV for TiO2-1CdS nanofibers. Photocatalytic properties of pure TiO2 and TiO2-CdS composite nanofibers were calculated by a methylene blue (MB) aqueous solution degradation under sunlight irradiation. The results revealed that TiO2-0.5CdS nanofibers have efficient photocatalytic activity of up to 98 % after only 60 min.
Highlights
Among the several treatment options, photocatalysis is thought to be the most cost-effective, successful, and environmentally friendly way for completely degrading organic contaminants in waste water [1, 2, 3]
Pure TiO2 nanofibers were polycrystalline with an anatase phase, whereas anatase and wurtzite phases coexisted in the TiO2-CdS composite nanofibers, according to X-ray diffraction (XRD) measurements
Photocatalytic properties of pure TiO2 and TiO2-CdS composite nanofibers were calculated by a methylene blue (MB) aqueous solution degradation under sunlight irradiation
Summary
Among the several treatment options, photocatalysis is thought to be the most cost-effective, successful, and environmentally friendly way for completely degrading organic contaminants in waste water [1, 2, 3]. The adjustment of TiO2 photocatalysts for increased light absorption and photocatalytic activity under sunlight irradiation has become a key research area in recent years due to the energy band gap value (3.2 eV) in the UV region. With a narrow band gap of 2.4 eV, CdS has been used to composite with TiO2 due to its visible-light response [5, 6]. Electrospinning, in comparison to other technologies for generating nanofibers, has the benefits of the ability to control, simplicity, low-cost, and manageability in producing industrial amounts [13]. This method has an attractive potential for producing nanofibers from Polymers, Ceramics or Composites with diameters ranging from tens of nanometers to several microns. The results showed that MB was entirely degraded after 60 min of exposure to sunlight
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