Inorganic–organic core–shell titania nanoparticles for efficient visible light activated photocatalysis

Moustakas, Nikolaos G.; Kontos, A. G.; Likodimos, V.; Katsaros, Fotios K.; Boukos, N.; Tsoutsou, D.; Dimoulas, A.; Romanos, George E.; Dionysiou, D. D.; Falaras, Polycarpos

doi:10.1016/j.apcatb.2012.10.007

Cited by 91 publications

(58 citation statements)

References 40 publications

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“…However, careful analysis of the spectra revealed more complex hyperfine structure with a coupling constant of about 1.6 mT (Figure 2e,f). Analogous EPR spectra previously found upon VIS-light illumination of modified nanostructured TiO 2 at 10 K were interpreted as a result of the light-induced excitation of organic residuals from the nitrogen precursors forming diverse organic radicals [45].…”

Section: Resultsmentioning

confidence: 80%

EPR Investigations of G-C3N4/TiO2 Nanocomposites

et al. 2018

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Abstract:The g-C 3 N 4 /TiO 2 nanopowders prepared by the annealing of melamine and TiO 2 P25 at 550 • C were investigated under dark and upon UV or visible-light photoactivation using X-and Q-band electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra of powders monitored at room temperature and 100 K showed the impact of the initial loading ratio of melamine/TiO 2 on the character of paramagnetic centers observed. For the photocatalysts synthesized using a lower titania content, the paramagnetic signals characteristic for the g-C 3 N 4 /TiO 2 nanocomposites were already found before exposure. The samples annealed using the higher TiO 2 loading revealed the photoinduced generation of paramagnetic nitrogen bulk centers (g-tensor components g 1 = 2.005, g 2 = 2.004, g 3 = 2.003 and hyperfine couplings from the nitrogen A 1 = 0.23 mT, A 2 = 0.44 mT, A 3 = 3.23 mT) typical for N-doped TiO 2 . The ability of photocatalysts to generate reactive oxygen species (ROS) upon in situ UV or visible-light photoexcitation was tested in water or dimethyl sulfoxide by EPR spin trapping using 5,5-dimethyl 1-pyrroline N-oxide. The results obtained reflect the differences in photocatalyst nanostructures caused by the differing initial ratio of melamine/TiO 2 ; the photocatalyst prepared by the high-temperature treatment of melamine/TiO 2 wt. ratio of 1:3 revealed an adequate photoactivity in both spectral regions.

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Section: Resultsmentioning

confidence: 80%

EPR Investigations of G-C3N4/TiO2 Nanocomposites

et al. 2018

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“…For the HVOF and WSP coatings, secondary absorption edges also exist at 2.34 eV and 2.22 eV, respectively. The main absorption edge at E bg (1) corresponds to non-stoichiometric TiO 2 features in rutile, and the secondary absorption edge at E bg (2) corresponds to an absorption tail of delocalized electronic states with a low excitation energy [19,21,22]. The existence of a secondary absorption edge does not seem to correlate tightly with the acetone photo-decomposition.…”

Section: Resultsmentioning

confidence: 97%

“…The difference in the intensities of peaks corresponding to rutile planes (indicated in the top image) is due to the different surface qualities of samples. The absence of peaks of known sub-stoichiometric titanium oxides is due to the fact that an oxygen-deficient structure can be, besides sub-stoichiometric titanium oxides, also formed predominantly by vacancies [19,20] and crystallographic stacking faults [14]. In the HR-TEM micrograph (Fig.…”

Section: Resultsmentioning

confidence: 99%

Structural and photocatalytic characteristics of TiO2 coatings produced by various thermal spray techniques

Ctibor¹,

Štengl²,

Pala³

2013

J Adv Ceram

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Titanium dioxide (TiO 2 ) was elaborated by four different thermal spray techniques-(i) plasma spraying using a water-stabilized torch, (ii) plasma spraying using a gas-stabilized torch, (iii) high velocity oxy-fuel gun, and (iv) oxy-acetylene flame. The porosity of the coatings was studied by optical microscopy, nano-structural features by scanning electron microscopy (SEM), phase composition by X-ray diffraction (XRD); the microhardness, surface roughness and wear resistance were evaluated. The diffuse reflectance was measured by ultra-violet/visible/near-infrared (UV/Vis/NIR) scanning spectrophotometer. The kinetics of photocatalytic degradation of gaseous acetone was measured under a UV lamp with 365 nm wavelength. After all the applied spray processes, the transformation of anatase phase from the initial powders to rutile phase in the coatings occurred. In spite of this transformation, all the coatings exhibited certain photocatalytic activity, which correlated well with their band gap energy calculated from reflectivity. All the coatings offer relatively good mechanical properties and can serve as robust photocatalysts.

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“…Co-doping of TiO 2 by N and F anions was achieved by a modified sol-gel method using a nonionic fluorosurfactant, as pore template material and fluorine source combined with ethylenediamine as nitrogen source (91). Moreover, the synthesis of m-modified TiO 2 was optimized using combustion sol-gel synthesis employing urea as nitrogen source (92). The evaluation of the photocatalytic activity of the above nanostructured catalysts for water detoxification from cyanotoxin compounds released by cyanobacteria blooms (e.g.…”

Section: Advanced Oxidation Processes Involving Innovative Nanocatalymentioning

confidence: 99%

Chapter Green Nanotechnology: Development of Nanomaterials for Environmental and Energy Applications

Fagan

Cui

Andersen

et al. 2013

ACS Symposium Series

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This book chapter discusses the syntheses of various nanomaterials, for green nanotechnology applications in detail. Special attention is given to the development of emerging areas, such as environmental as well as energy materials. Various approaches for preparing nanostructured photocatalysts, such as titanium dioxide, zinc oxide, iron oxide, and metal sulfides, different conventional methods and novel methods, including

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Inorganic–organic core–shell titania nanoparticles for efficient visible light activated photocatalysis

Cited by 91 publications

References 40 publications

EPR Investigations of G-C3N4/TiO2 Nanocomposites

EPR Investigations of G-C3N4/TiO2 Nanocomposites

Structural and photocatalytic characteristics of TiO2 coatings produced by various thermal spray techniques

Chapter Green Nanotechnology: Development of Nanomaterials for Environmental and Energy Applications

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