“…3g) some TiO 2 particles decorated with Ag were found as pointed by the white arrows. Similar results have been previously reported by other authors [24, 25, 26]. Fig.…”
“Titanium dioxide (TiO
2
) is a semiconductor material that exhibits antibacterial activity due to its photocatalytic properties under ultraviolet light. On the other hand, silver also exhibits strong antibacterial activity towards a wide range of microorganisms and TiO
2
with silver addition exhibits more efficient photocatalytic properties than unmodified TiO
2
. In this work, TiO
2
nanoparticles were synthesized by the hydrothermal method and modified with silver by two different methods: wet impregnation (
Ex situ
) and
In situ
incorporation. The antimicrobial activity of TiO
2
nanoparticles synthesized and modified by both methods was evaluated against
Escherichia coli
and
Staphylococcus aureus
. The results showed that TiO
2
nanoparticles have anatase phase. Also, spherical morphology with a mean particle size around 10.6 nm was obtained. The presence of silver in the modified TiO
2
nanoparticles was confirmed by EDS and XPS. TiO
2
particles modified by the
Ex situ
method, showed a better bactericidal activity compared to the particles modified by
In situ
incorporation method and TiO
2
unmodified nanoparticles. This study demonstrated that both methods used to modify the titanium dioxide nanoparticles are effective as bactericidal materials and better results were found for the
Ex situ
method.”
“…3g) some TiO 2 particles decorated with Ag were found as pointed by the white arrows. Similar results have been previously reported by other authors [24, 25, 26]. Fig.…”
“Titanium dioxide (TiO
2
) is a semiconductor material that exhibits antibacterial activity due to its photocatalytic properties under ultraviolet light. On the other hand, silver also exhibits strong antibacterial activity towards a wide range of microorganisms and TiO
2
with silver addition exhibits more efficient photocatalytic properties than unmodified TiO
2
. In this work, TiO
2
nanoparticles were synthesized by the hydrothermal method and modified with silver by two different methods: wet impregnation (
Ex situ
) and
In situ
incorporation. The antimicrobial activity of TiO
2
nanoparticles synthesized and modified by both methods was evaluated against
Escherichia coli
and
Staphylococcus aureus
. The results showed that TiO
2
nanoparticles have anatase phase. Also, spherical morphology with a mean particle size around 10.6 nm was obtained. The presence of silver in the modified TiO
2
nanoparticles was confirmed by EDS and XPS. TiO
2
particles modified by the
Ex situ
method, showed a better bactericidal activity compared to the particles modified by
In situ
incorporation method and TiO
2
unmodified nanoparticles. This study demonstrated that both methods used to modify the titanium dioxide nanoparticles are effective as bactericidal materials and better results were found for the
Ex situ
method.”
“…This is because the electron migration transferring from TiO 2 to Ag. It has been demonstrated that Ag can accept electrons, meanwhile the electrons migrate to Ti 4+ to form Ti 3+ (Ag + e -→ Ag -, e -+ Ti 4+ → Ti 3+ ) [58]. The high-resolution core-level Ti 2p spectra confirm the coexistences of Ti 4+ and Ti 3+ in TiO 2 for both filaments.…”
Section: Chemical Statesmentioning
confidence: 74%
“…(530.8 eV) and the corresponding Ti2p signal (Figure 4(j)) is fitted to four sub-peaks of O-Ti 2p3/2 (457.9 eV), O-T 4+ 2p1/2 (463.5 eV), O-Ti 3+ 2p3/2 (459.9 eV) and O-Ti 3+ 2p1/2 (465.5 eV). Moreover, the Ag3d signal of the Ag-doped TiO2 coated filaments is deconvoluted into two sub-peaks of Ag3d5/2 (368.6 eV) and Ag3d3/2 (373.9 eV), suggesting the existence of the metallic Ag phase [58]. In comparison with the TiO2 coated filaments, the increases of the binding energies of O-Ti 4+ and O-Ti 3+ for the Ag-doped TiO2 coated filaments are due to the interaction of Ag + ions with TiO2 [59].…”
Section: Chemical Statesmentioning
confidence: 99%
“…The high-resolution core-level Ti 2p spectra confirm the coexistences of Ti 4+ and Ti 3+ in TiO 2 for both filaments. For the P-1 filaments (Figure 4c), the sub-peaks centered at 457.2 eV and 463.0 eV (spin orbit splitting of 5.8 eV) are assigned to Ti 4+ 2p3/2 and Ti 4+ 2p1/2 , while the sub-peaks located at 459.0 eV and 465.0 eV are attributed to Ti 3+ 2p3/2 and Ti 3+ 2p1/2 , respectively [58]. In the case of the P-2 filaments (Figure 4e), the sub-peaks at 458.7 eV and 464.3 eV (spin orbit splitting of 5.6 eV) are associated with Ti 4+ 2p3/2 and Ti 4+ 2p1/2 and the peaks at 459.6 eV and 465.6 eV are ascribed to Ti 3+ 2p3/2 and Ti 3+ 2p1/2 , respectively.…”
In this study, the effects of disperse blue dye-sensitization on the photocatalytic properties of the Ag-N co-doped TiO2 nanoparticles loaded on polyethylene terephthalate (PET) filaments are investigated under visible light irradiation. The microstructure and photocatalytic properties of the as-synthesized TiO2 nanocomposites, as well as the as-prepared PET filaments, are systematically characterized. The photocatalytic performance of the PET filaments coated with the Ag-N co-doped TiO2 nanoparticles sensitized with disperse blue dyes is evaluated via its capacity of photo-degrading methyl orange (MO) dyes under visible light irradiation. It is found that the holes are the predominant reactive radical species and the hydroxyl and superoxide radicals play a subordinate role in the photocatalytic reaction process. The reaction rate constant of the photocatalytic composite filaments is nearly 4.0 times higher than that of the PET filaments loaded solely with TiO2 nanoparticles. The resultant photocatalytic composite filaments are evident to be capable of repeatedly photo-degrading MO dyes without losing its photocatalytic activity significantly.
“…In comparison with the literature, the performance of C-N-TiO 2 solar cell with 9% conversion efficiency was much higher than the values reported in previous investigations [77][78][79]. Besides, Dong et al [80] used hydrothermal protocol to synthesize TiO 2 and Ag-doped TiO 2 (Ag-TiO 2 ) nanoparticles that were used in the dye-sensitized solar cell (DSSC) application. Their outcomes showed that 6.44 and 5.05% solar conversion efficiencies were achieved with TiO 2 and Ag-TiO 2 nanoparticle-based dye-sensitized solar cells (DSSC), respectively.…”
Producing active thin films coated on supports resolves many issues of powder-based photo catalysis and energy harvesting. In this study, thin films of C-N-TiO2 were prepared by dynamic spin coating of C-N-TiO2 sol-gel on glass support. The effect of spin speed and sol gel precursor to solvent volume ratio on the film thickness was investigated. The C-N-TiO2-coated glass was annealed at 350 °C at a ramping rate of 10 °C/min with a holding time of 2 hours under a continuous flow of dry N2. The C-N-TiO2 films were characterised by profilometry analysis, light microscopy (LM), and scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). The outcomes of this study proved that a spin coating technique followed by an annealing process to stabilise the layer could be used for immobilisation of the photo catalyst on glass. The exposure of C-N-TiO2 films to UV radiation induced photocatalytic decolouration of orange II (O.II) dye. The prepared C-N-TiO2 films showed a reasonable power conversion efficiency average (PCE of 9%) with respect to the reference device (15%). The study offers a feasible route for the engineering of C-N-TiO2 films applicable to wastewater remediation processes and energy harvesting in solar cell technologies.
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