Structural and surface approach to the enhanced photocatalytic activity of sulfated TiO2 photocatalyst

Colón, G.; Hidalgo, M.C.; Munuera, G.; Ferino, Italo; Cutrufello, Maria Giorgia; Navı́o, J.A.

doi:10.1016/j.apcatb.2005.09.008

Cited by 239 publications

(138 citation statements)

References 51 publications

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“…This peak at 169 eV was previously explained as S 6+ cation present in the titania lattice. 18,28,29 Therefore, anionic and cationic doping was achieved in the same titania through this chemical modification method.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

“…However, these materials converted to rutile phase at 800°C, and subsequently the photocatalytic activity was also reduced. 18 The (NH 4 ) 2 SO 4 impregnation on TiO 2 reported by Ortiz-Islas et al showed brookite and mascagnite phase as an impurity. 20 Furthermore the complete phase transformation to rutile occurred in the range 650-50°C…”

Section: Introductionmentioning

confidence: 99%

“…Sulfate impregnation of TiO 2 has recently been reported to improve the photocatalytic activity of titania. [17][18][19] For example, Colon et al reported using this methodology to improve the phase stability of anatase up to 700°C. They also noted the higher photocatalytic activity for the impregnated sample compared to the unmodified one.…”

Section: Introductionmentioning

confidence: 99%

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One-Pot Synthesis of Anionic (Nitrogen) and Cationic (Sulfur) Codoped High-Temperature Stable, Visible Light Active, Anatase Photocatalysts

et al. 2009

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An efficient and straightforward method for the preparation of nitrogen and sulfur (N, S) codoped high-temperature stable, visible light active, anatase titania is reported. For the first time simultaneous nitrogen and sulfur doping was achieved using a single source, ammonium sulfate [(NH 4 ) 2 SO 4 ], as the modification agent of the titanium isopropoxide (TTIP) precursor. A stoichiometric modification of 1:8 TTIP:(NH 4 ) 2 SO 4 composition (TNS8) was found to be the most effective in extending the stability of anatase to higher temperatures. This particular modification resulted in 100% anatase at 850°C and 41% anatase at 900°C, whereas the control titania contained only 12% anatase at 700°C and completely transformed to rutile at 800°C. Codoped (N, S) titania was investigated by a range of characterization techniques including XRD, Raman spectroscopy, XPS, and FTIR. XPS indicated the existence of nitrogen as an anion dopant and sulfur as a cation dopant within the TiO 2 lattice. The UV/visible and visible light photocatalytic studies were carried out using the rhodamine 6G dye as a model system. The visible light photocatalytic activity of the TNS8 sample calcined at 850°C was double that of Degussa P25, and the rate constant calculated by pseudo-first-order kinetics was 0.019 min -1 for the TNS8 sample and 0.008 min -1 for Degussa P25. This higher photocatalytic activity was attributable to a combination of improved anatase phase stability, higher surface area, and codoped (N, S) titania lattice. Moreover, this codoped (N, S) sample also exhibits excellent photocatalytic activity under UV/visible light.

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Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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One-Pot Synthesis of Anionic (Nitrogen) and Cationic (Sulfur) Codoped High-Temperature Stable, Visible Light Active, Anatase Photocatalysts

et al. 2009

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“…Among the inorganic acids, sulfated transition-metal oxides have become the subject of intensive studies, due to the high stability and extraordinary acidity of some of these compounds, as, for instance, sulfated zirconium oxide [1][2][3], sulfated tin oxide [4,5], and sulfated titanium oxide [6]. The latter has been widely studied in the past as a catalyst and as a proton conductor [7,8]. Recently, sulfated titania nanoparticles have been added to various polymers to form composite membranes with improved thermal and mechanical properties and enhanced proton conductivity [9].…”

Section: Introductionmentioning

confidence: 99%

Structural and Spectroscopic Characterization of A Nanosized Sulfated TiO2 Filler and of Nanocomposite Nafion Membranes

et al. 2016

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A large number of nano-sized oxides have been studied in the literature as fillers for polymeric membranes, such as Nafion ® . Superacidic sulfated oxides have been proposed and characterized. Once incorporated into polymer matrices, their beneficial effect on peculiar membrane properties has been demonstrated. The alteration of physical-chemical properties of composite membranes has roots in the intermolecular interaction between the inorganic filler surface groups and the polymer chains. In the attempt to tackle this fundamental issue, here we discuss, by a multi-technique approach, the properties of a nanosized sulfated titania material as a candidate filler for Nafion membranes. The results of a systematic study carried out by synchrotron X-ray diffraction, transmission electron microscopy, thermogravimetry, Raman and infrared spectroscopies are presented and discussed to get novel insights about the structural features, molecular properties, and morphological characteristics of sulphated TiO 2 nanopowders and composite Nafion membranes containing different amount of sulfated TiO 2 nanoparticles (2%, 5%, 7% w/w).

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“…The binding energies for the different samples can be found in Table 3. The different BE of O 1s is attributed to the chemically non-equivalent O atoms: O 1s(1) is due to oxygen bonded to metal atoms; O 1s (2) is due to oxygen in metal-OH bonds; and O 1s(3) is due to oxygen bonded to carbon [42][43][44].…”

Section: Materials Characterizationmentioning

confidence: 99%

Characterisation, phase stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles

Mattsson

Lejon

Bakardjieva

et al. 2013

Journal of Solid State Chemistry

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PostprintThis is the accepted version of a paper published in Journal of Solid State Chemistry. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. Citation for the original published paper (version of record):Mattsson, A., Lejon, C., Bakardjieva, S., Stengl, V., Österlund, L. (2013) Characterisation, phase-stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles. The band gap is slightly blue-shifted at high doping concentrations, and red shifted at lower doping concentrations. Formic acid adsorption was used as a probe molecule to investigate surface chemical properties and adsorbate structures. It was found that the relative abundance of monodentate formate compared to bidentate coordinated formate decreases with increasing doping concentration. This is attributed to an increased surface acidity with increasing dopant concentration. Photodegradation of formic acid occurred on all samples. With mode-resolved in situ FTIR spectroscopy it is shown that the rate of photodegradation of monodentate formate species are higher than for bidentate formate species. Thus our results show that the trend of decreasing photo-degradation rate with increasing dopant concentration can be explained by the adsorbate structure, which is controlled by the acidity of the surface. Journal of Solid

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Structural and surface approach to the enhanced photocatalytic activity of sulfated TiO2 photocatalyst

Cited by 239 publications

References 51 publications

One-Pot Synthesis of Anionic (Nitrogen) and Cationic (Sulfur) Codoped High-Temperature Stable, Visible Light Active, Anatase Photocatalysts

One-Pot Synthesis of Anionic (Nitrogen) and Cationic (Sulfur) Codoped High-Temperature Stable, Visible Light Active, Anatase Photocatalysts

Structural and Spectroscopic Characterization of A Nanosized Sulfated TiO2 Filler and of Nanocomposite Nafion Membranes

Characterisation, phase stability and surface chemical properties of photocatalytic active Zr and Y co-doped anatase TiO2 nanoparticles

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