Sol–gel iron-doped TiO2 nanopowders with photocatalytic activity

Crışan, Maria; Răileanu, Mina; Drăgan, Nicolae; Crışan, D.; Ianculescu, Adelina; Niţoi, Ines; Oancea, Petruţa; Şomăcescu, Simona; Stănică, Nicolae; Vasile, Bogdan Ștefan; Stan, Cristina

doi:10.1016/j.apcata.2014.10.031

Cited by 67 publications

(36 citation statements)

References 51 publications

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“…The binding energy difference of 5.6 eV in both Fe x Ti y O z and N/Fe x Ti y O z films revealed a valence state +4 for Ti, indicating the presence of titanium atoms in the form Ti 4+ . It is known that the XPS lines belong to Ti2p 3/2 component at 458.2–458.9 eV are attributed to the Ti (IV) species of the pure titania crystalline network and signed to a titanium atom surrounded by two oxygen atoms [19]. We observed the shift of Ti2p components towards the higher binding energy that is explained by formation of the Fe–O–Ti bonds.…”

Section: Resultsmentioning

confidence: 53%

Non-porous Iron Titanate Thin Films Doped with Nitrogen: Optical, Structural, and Photocatalytic Properties

2017

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The synthesized undoped and nitrogen doped iron titanate films treated at 450 and 500 °C were crystallized forming pseudobrookite and landauite phase as shown by XRD patterns. The presence of urea in the synthesis procedure promoted the crystallization rate. XPS data indicated that iron ions existed in divalent and trivalent forms, and their ratio was changed for nitrogen-doped sample. The formation of the complexes between iron and urea during sol aging with the following reduction of Fe3+ to Fe2+ within calcination can be a reason not only for accumulation of iron onto the surface as shown by EDS but also for twice increase of divalent iron as registered by XPS. The iron titanate films extended the visible light absorption. Two band gap energy values for all iron-contained films were calculated. The photocatalytic response of all iron titanate films treated at 450 °C compared to pure titania films was spectacularly enhanced under UV and visible light. The slight enhance in photocatalytic activity of nitrogen-doped iron titanate films can be explained by the interstitial nitrogen incorporation rather than substitutional.

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Section: Resultsmentioning

confidence: 53%

Non-porous Iron Titanate Thin Films Doped with Nitrogen: Optical, Structural, and Photocatalytic Properties

2017

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“…An inverse proportionality can be observed between the analyte concentration and the time of irradiation, according with a so‐called pseudo‐second order kinetic models and C 0 ⋅k was calculated to be 3*10 −2 . This behavior is peculiar enough for such structures, in fact it is largely reported that a first‐order model or a Langmuir‐Hinshalwood kinetic model can be used to fit the analyte concentration change as a function of the time , . The initial concentration of PHXETOH was reduced of about 75% after 60 minutes of illumination with the green laser in presence of iron‐doped TiO 2 nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Design and Synthesis of Iron‐Doped Nanostructured TiO₂ and Its Potential Use in the Photodegration of Hazardous Materials Present in Personal Care Products

et al. 2017

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Parabens and phenoxyethanol are chemical compounds widely used as preservatives and antimicrobial agents in cosmetic and personal care products. The issue of their effect on human and environmental health is a particularly topical and relevant one that many national and international agencies reported about the risk from the use of such compounds. In the present paper, iron doped TiO 2 nanoparticles were synthetized and characterized by morphological and spectroscopic techniques. The proposed synthesis was designed to improve the photocatalytic activity of the nanostructures towards the two preservatives compounds when irradiated by a visible light, in order to optimize the effect of natural irradiation on the photodegradation of the two compounds. Preliminary photocatalytic tests showed that the analytes' concentration in water solutions under illumination in presence of both iron-doped TiO 2 and pure TiO 2 decreased. A sensible enhancement of photocatalysis of both propylparaben and phenoxyethanol was recorded in presence of the Fe-doped nanostructures as a consequence of the physical and chemical properties of the catalyst.[a] Dr. Scheme 1. Chemical structure of a) paraben and b) phenoxylethanol. The group labeled with R can be an alkyl group.

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“…Both the symmetry of these peaks and the absence of shoulders are correlated with the formation of TiO 2 crystals without peculiar defects [22]. The peak of O 1s at 530.9 eV (Figure 3c), attributed to TiO 2 , exhibit an asymmetry to higher binding energies (~ 533 eV), due to the presence of OH groups on TiO 2 surface [23,24]. The latter is in accordance with the FTIR results, indicating the presence of the hydroxyl bonds.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

et al. 2019

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Iron-doped TiO2 nanoparticles, ranging in Fe concentrations from 0.05 up to 1.00% w/w, were synthesized through a simple sol-gel method. Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), Ultraviolet-Visible (UV-Vis) spectroscopy, nitrogen adsorption−desorption isotherms, X-ray photoelectron spectroscopy (XPS), and X-ray absorption near-edge structure spectroscopy (XANES) were used to characterize the synthesized nanoparticles. The characterization of the Fe-doped TiO2 nanoparticles revealed the predominant presence of anatase crystalline form, as well as the incorporation of the Fe3+ ions into the crystal lattice of TiO2. The photocatalytic assessment of the Fe-doped TiO2 nanoparticles indicated that the low iron doping titania (0.05 and 0.10% w/w) have a positive effect on the photocatalytic degradation of Methyl Orange under visible radiation. Moreover, FTIR monitoring of calcium hydroxide pastes enriched with low Fe-doped TiO2 revealed enhancement of carbonation at both early and later stages. Improved photocatalytic performance and increased lime carbonation, observed in lime coatings with low Fe-doped TiO2 admixtures, established them as invaluable contributors to the protection of the built environment.

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Sol–gel iron-doped TiO2 nanopowders with photocatalytic activity

Cited by 67 publications

References 51 publications

Non-porous Iron Titanate Thin Films Doped with Nitrogen: Optical, Structural, and Photocatalytic Properties

Non-porous Iron Titanate Thin Films Doped with Nitrogen: Optical, Structural, and Photocatalytic Properties

Design and Synthesis of Iron‐Doped Nanostructured TiO₂ and Its Potential Use in the Photodegration of Hazardous Materials Present in Personal Care Products

Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

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Sol–gel iron-doped TiO2 nanopowders with photocatalytic activity

Cited by 67 publications

References 51 publications

Non-porous Iron Titanate Thin Films Doped with Nitrogen: Optical, Structural, and Photocatalytic Properties

Non-porous Iron Titanate Thin Films Doped with Nitrogen: Optical, Structural, and Photocatalytic Properties

Design and Synthesis of Iron‐Doped Nanostructured TiO2 and Its Potential Use in the Photodegration of Hazardous Materials Present in Personal Care Products

Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

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Design and Synthesis of Iron‐Doped Nanostructured TiO₂ and Its Potential Use in the Photodegration of Hazardous Materials Present in Personal Care Products