Laser oxidative pyrolysis synthesis and annealing of TiO2 nanoparticles embedded in carbon–silica shells/matrix

Fleaca, C.; Scarisoreanu, M.; Morjan, I.; Luculescu, C.; Niculescu, A.; Badoi, A.; Vasile, Eugeniu; Kovács, Gábor

doi:10.1016/j.apsusc.2014.11.106

Cited by 14 publications

(7 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the ZTO 0.44 case, in spite of an apparent oxygen excess, the carbon is still formed (the EDX-extracted carbon atomic percent is the smallest from all ZTO powders) and this fact can be attributed to an insufficient diffusion between the oxygen from the annular flow and alkylmetals vapors from the central flow. Also, for the undoped sample, the ethylene sensitizer seems to be another major carbon source in the resulting metal-oxide-based powder, similar to the process of ethylene-sensitized TiCl 4 oxidative laser pyrolysis that we previously reported [35–36].…”

Section: Resultssupporting

confidence: 60%

Zn/F-doped tin oxide nanoparticles synthesized by laser pyrolysis: structural and optical properties

Dumitrache

Morjan

Dutu

et al. 2019

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

Zn/F co-doped SnO2 nanoparticles with a mean diameter of less than 15 nm and a narrow size distribution were synthesized by a one-step laser pyrolysis technique using a reactive mixture containing tetramethyltin (SnMe4) and diethylzinc (ZnEt2) vapors, diluted Ar, O2 and SF6. Their structural, morphological, optical and electrical properties are reported in this work. The X-ray diffraction (XRD) analysis shows that the nanoparticles possess a tetragonal SnO2 crystalline structure. The main diffraction patterns of stannous fluoride (SnF2) were also identified and a reduction in intensity with increasing Zn percentage was evidenced. For the elemental composition estimation, energy dispersion X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) measurements were performed. In general, both analyses showed that the Zn percentage increases with increasing ZnEt2 flow, accompanied at the same time by a decrease in the amount of F in the nanopowders when the same SF6 flow was employed. The Raman spectra of the nanoparticles show the influence of both Zn and F content and crystallite size. The fluorine presence is due to the catalytic partial decomposition of the SF6 laser energy transfer agent. In direct correlation with the increase in the Zn doping level, the bandgap of co-doped nanoparticles shifts to lower energy (from 3.55 to 2.88 eV for the highest Zn dopant concentration).

show abstract

Section: Resultssupporting

confidence: 60%

Zn/F-doped tin oxide nanoparticles synthesized by laser pyrolysis: structural and optical properties

Dumitrache

Morjan

Dutu

et al. 2019

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…The contribution of PANI to the overall degradation efficiency is further highlighted by the increased removal efficiency of BPA in graph (b) compared to graph (a) under darkness. The removal in graph (b) can be attributed to adsorption via π–π stacking and hydrogen bonding of BPA and PANI . The slight removal that was observed on graph (a) can be attributed to photolysis.…”

Section: Resultsmentioning

confidence: 94%

“…These bands reveal the existence of PANI in the synthesized PANI/TiO 2 sample. At 700 cm –1 , a peak assigned to Ti–O–Ti bridging stretch modes was observed on the TiO 2 spectra …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Polyaniline-Coated TiO₂Nanorods for Photocatalytic Degradation of Bisphenol A in Water

2020

View full text Add to dashboard Cite

Polyaniline (PANI)-wrapped TiO2 nanorods (PANI/TiO2), obtained through the oxidative polymerization of aniline at the surface of hydrothermally presynthesized TiO2 nanorods, were evaluated as photocatalysts for the degradation of Bisphenol A (BPA). Fourier-transform infrared spectroscopy analysis revealed the successful incorporation of PANI into TiO2 by the appearance of peaks at 1577 and 1502 cm–1 that are due to the CC and C–N stretch of the benzenoid or quinoid ring in PANI. Brunauer–Emmett–Teller analysis revealed that PANI/TiO2 had almost double the surface area of TiO2 (44.8999 m2/g vs 28.2179 m2/g). Transmission electron microscopy (TEM) analysis showed that TiO2 nanorods with different diameters were synthesized. The TEM analysis showed that a thin layer of PANI wrapped the TiO2 nanorods. X-ray photon spectroscopy survey scan of the PANI/TiO2 nanocomposite revealed the presence of C, O, Ti, and N. Photocatalytic activity evaluation under UV radiation through the effect of key parameters, including pH, contact time, dosage, and initial concentration of BPA, was carried out in batch studies. Within 80 min, 99.7% of 5 ppm BPA was attained using the 0.2 g/L PANI/TiO2 photocatalyst at pH 10. The quantum yield (QY) of these photocatalysts was evaluated to be 9.86 × 10–5 molecules/photon and 2.82 × 10–5 molecules/photon for PANI/TiO2 and TiO2, respectively. PANI/TiO2 showed better performance than as-synthesized TiO2 with a rate constant of 4.46 × 10–2 min–1 compared to 2.18 × 10–2 min–1. The rate of degradation of PANI/TiO2 was also superior to that of TiO2 (150 mmol/g/h vs 74.89 mmol/g/h). Nitrate ions increased the rate of degradation of BPA, while humic acid consistently inhibited the degradation of BPA. LC–MS analysis identified degradation products with m/z 213.1, 135.1, and 93.1. The PANI/TiO2 nanocomposite was reused up to five cycles with a removal of at least 80% in the fifth cycle. LC–MS results revealed three possible BPA degradation intermediates. LC–MS analysis identified degradation products which included protonated BPA, [C14H13O2 +], and [C9H11O+]. The PANI/TiO2 nanocomposite demonstrated superior photocatalytic activity with respect to improved QY and figure of merit and lower energy consumption.

show abstract

“…Amorphous TiO 2 does not present photocatalytic activity. Some studies 6,7 report that the anatase phase is more efficient in the photocatalytic process, while others 8,9 describe that small amounts of rutile phase mixed with anatase increase the photocatalytic efficiency of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Effect of Growth Parameters on the Photocatalytic Performance of TiO2 Films Prepared by MOCVD

Marcello¹,

Corrêa²,

Bento³

et al. 2020

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

The present study evaluated the main factors that influence the photocatalytic activity of titanium dioxide (TiO 2 ) films grown by metalorganic chemical vapor deposition (MOCVD) at 400 and 500 °C, in different growth times. The photocatalytic behavior was analyzed by measuring the methyl orange dye degradation at different pH values. Structural and morphological characteristics, and the recyclability of the catalysts for several cycles were also investigated. Anatase phase was identified in all films. The higher photodegradation performances were obtained at acidic pH. The results demonstrated that the photocatalyst thickness is an important parameter in heterogenous photocatalysis. The best photocatalytic result occurred for the 395 nm-thick TiO 2 film grown at 400 °C, which presented 65.3% of the dye degradation under UV light. The recyclability experiments demonstrated that the TiO 2 films grown by MOCVD present a great stability after several photocatalytic cycles, which allows their practical application for water treatment with high efficiency.

show abstract

Laser oxidative pyrolysis synthesis and annealing of TiO2 nanoparticles embedded in carbon–silica shells/matrix

Cited by 14 publications

References 50 publications

Zn/F-doped tin oxide nanoparticles synthesized by laser pyrolysis: structural and optical properties

Zn/F-doped tin oxide nanoparticles synthesized by laser pyrolysis: structural and optical properties

Polyaniline-Coated TiO₂Nanorods for Photocatalytic Degradation of Bisphenol A in Water

Effect of Growth Parameters on the Photocatalytic Performance of TiO2 Films Prepared by MOCVD

Contact Info

Product

Resources

About

Laser oxidative pyrolysis synthesis and annealing of TiO2 nanoparticles embedded in carbon–silica shells/matrix

Cited by 14 publications

References 50 publications

Zn/F-doped tin oxide nanoparticles synthesized by laser pyrolysis: structural and optical properties

Zn/F-doped tin oxide nanoparticles synthesized by laser pyrolysis: structural and optical properties

Polyaniline-Coated TiO2Nanorods for Photocatalytic Degradation of Bisphenol A in Water

Effect of Growth Parameters on the Photocatalytic Performance of TiO2 Films Prepared by MOCVD

Contact Info

Product

Resources

About

Polyaniline-Coated TiO₂Nanorods for Photocatalytic Degradation of Bisphenol A in Water