Relationship concerning the nature and concentration of Fe(III) species on the surface of TiO2 particles and photocatalytic activity of the catalyst

Piera, Eva; Tejedor-Tejedor, M. Isabel; Zorn, Michael E.; Anderson, Marc A.

doi:10.1016/s0926-3373(03)00288-1

Cited by 115 publications

(62 citation statements)

References 43 publications

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“…This mass loss is attributed to the release of the adsorbed water in the membrane surfaces, interstitial water, adsorbed ethanol and the thermal decomposition of the organic residues. The endothermic peak observed at 97ºC in the DSC curve is due to the water loss and the exothermic peak at 259ºC is attributed to the thermal decomposition of the organic matter and sintering between the nanoparticles in the xerogels and in agreement with the literature [32] and in disagreement with the reference [33]. As can be seen in the X-ray spectra shown in Fig.…”

Section: Undoped Tiosupporting

confidence: 85%

Synthesis and characterization of Fe(III)-doped ceramic membranes of titanium dioxide and its application in photoelectrocatalysis of a textile dye

et al. 2011

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Pure and Fe(III)-doped TiO2 suspensions were prepared by the sol gel method with the use of titanium isopropoxide (Ti(OPri)4) as precursor material. The properties of doped materials were compared to TiO2 properties based on the characterization by thermal analysis (TG-DTA and DSC), X-ray powder diffractometry and spectroscopy measurements (FTIR). Both undoped and doped TiO2 suspensions were used to coat metallic substrate as a mean to make thin-film electrodes. Thermal treatment of the precursors at 400°C for 2 h in air resulted in the formation of nanocrystalline anatase TiO2. The thin-film electrodes were tested with respect to their photocatalytic performance for degradation of a textile dye in aqueous solution. The plain TiO2 remains as the best catalyst at the conditions used in this report.

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Section: Undoped Tiosupporting

confidence: 85%

Synthesis and characterization of Fe(III)-doped ceramic membranes of titanium dioxide and its application in photoelectrocatalysis of a textile dye

et al. 2011

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“…, special efforts have been dedicated to doping TiO 2 with Fe [6][7][8][9][10][11][12][13][14][15][16][17]. It has been reported that Fe ions can act as shallow charge traps in the TiO 2 lattice and result in high photocatalytic activity [1,18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization of Fe-doped TiO2 Nanotubes with High Photocatalytic Activity

et al. 2009

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Fe-doped titanate nanotubes were prepared by the combination of sol-gel process with hydrothermal treatment. After a further calcinations process, Fe-doped TiO 2 nanotubes (Fe/TiO 2 NTs) with high photocatalytic activity were obtained. The prepared catalysts were characterized by XRD, TEM, and XPS. The photocatlytic activity of Fe/TiO 2 NTs was evaluated through the photodegradation of aqueous methyl orange. The experiments demonstrated that the 0.5% Fe/TiO 2 NTs calcined at 300°C possessed the best photocatalytic activity. Compared with pure TiO 2 nanotubes, the doping with Fe significantly enhanced the photocatalytic efficiency.

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“…Two kinds of materials are often doped in TiO 2 to extend the optical absorbance: (1) metal ions, such as Cr, V, Fe, Pb, Cu, etc. [3][4][5][6]. They can extend the photoresponse of TiO 2 to the visible light region, however, the doped metal ions can also play the role of the recombination centers to reduce its photocatalytic activity [7]; (2) nonmetalic ions, such as C, N, F, P, S, etc.…”

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confidence: 99%

A novel TiO2 with a large amount of bulk intrinsic defects—Visible-light-responded photocatalytic activity induced by foreign trap

Zhang

Jin

et al. 2013

Chin. Sci. Bull.

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A novel TiO 2 (anatase) containing a large amount of single electron trapped oxygen vacancies (SETOV) was prepared by dehydration of titanic acid nanotubes. This novel TiO 2 contains high concentration intrinsic defects in bulk structure, while its surface still remains the stoichiometric structure to protect them. And this novel TiO 2 itself has the visible light absorption without any doping, so we call it as the third generation of TiO 2 . However, it is regretted that this novel TiO 2 (A) only has photocatalytic activity under UV light irradiation, and was inactive for the visible light. The true reasons for this phenomenon were investigated by the transient IR absorption and photoluminescence spectra. Through constructing the foreign electron traps (PdO, PtO 2 ), the photocatalytic oxidation of propylene under visible light irradiation was successfully achieved. The removal yield of propylene (C 3 H 6 ) reached 7.6% and 28% on 2 wt.% PtO 2 /novel TiO 2 and 2 wt.% PdO/novel TiO 2 , respectively. By comparison with the noble metal electron traps (Pt, Pd), we found that the effective foreign electron traps need to satisfy two conditions: (1) Fe, Pb, Cu,. They can extend the photoresponse of TiO 2 to the visible light region, however, the doped metal ions can also play the role of the recombination centers to reduce its photocatalytic activity [7]; (2) nonmetalic ions, such as C, N, F, P, S, etc. Recently, much attention has been focused on the nitrogen doping [8][9][10][11][12][13]. It should be emphasized is that the origin of the visible-lightresponded photocatalytic activity of N-doped TiO 2 still remains disputable [14][15][16][17][18][19]. The redox potential of the doped nitrogen (e.g. -NO) exists within V cb to V vb of TiO 2 [20], so the photoelectrochemical stability of the N-doped TiO 2 may be a question for the practical application. In addition to the non-intrinsic defects can make the photo-response of TiO 2 red-shift, the intrinsic defects can also play the same role. As well known, when TiO 2 was reduced in H 2 atmosphere or treated under vacuum at high temperature, two kinds of intrinsic defects (i.e. oxygen vacancies denoted as V o˙˙, and Ti 3+ ) would form on TiO 2 surface simultaneously [21][22][23]. The energy levels of both in-

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Relationship concerning the nature and concentration of Fe(III) species on the surface of TiO2 particles and photocatalytic activity of the catalyst

Cited by 115 publications

References 43 publications

Synthesis and characterization of Fe(III)-doped ceramic membranes of titanium dioxide and its application in photoelectrocatalysis of a textile dye

Synthesis and characterization of Fe(III)-doped ceramic membranes of titanium dioxide and its application in photoelectrocatalysis of a textile dye

Synthesis, Characterization of Fe-doped TiO2 Nanotubes with High Photocatalytic Activity

A novel TiO2 with a large amount of bulk intrinsic defects—Visible-light-responded photocatalytic activity induced by foreign trap

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