Titanium Dioxide in the Service of the Biomedical Revolution

Rajh, Tijana; Dimitrijević, Nada M.; Bissonnette, Marc; Koritarov, Tamara; Konda, Vani J.

doi:10.1021/cr500029g

Cited by 261 publications

(184 citation statements)

References 174 publications

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“…The results show that the reaction of the excited electrons or holes with oxygen in aqueous suspension is able to generate a significant amount of oxidant as shown by the formation of 5,5-dimethy l-2-pyrrolidone-N-oxyl (DMPOX). 52 In addition, the photogenerated charge carriers participated in the photocatalytic reaction directly, which was confirmed by the photocatalytic oxidation of Bisphenol A (BPA), and reduction of Cr VI in neutral conditions. BPA, which has been reported to cause adverse effects on aquatic organisms, 53 was chosen as a probe to assess the role of holes in degradation.…”

Section: ■ Results and Discussionmentioning

confidence: 89%

Substitution Boosts Charge Separation for High Solar-Driven Photocatalytic Performance

Zhang

Liu

et al. 2016

ACS Appl. Mater. Interfaces

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Bandgap engineering of photocatalysts is a common approach to achieving high effective utilization of solar resource. However, the difficulty in achieving bandgap narrowing and high activity simultaneously seems to be irreconcilable via the traditional modification pathway. Herein, we have substituted iodine for a fraction of bromine atoms in BiOBr to overcome this restriction and provided some deep-seated insights into how the substitution boosts the photocatalytic properties. The substituted BiOBr 0.75 I 0.25 exhibited exceptional photoactivity, with photon-to-current conversion efficiency approximately 6 times greater than TiO 2 in UV region, and more than 10 times higher than BiOBr or BiOI in visible-light region. We found that the substitution narrowed the bandgap, facilitated the diffusion of electron with small effective mass, as well as induced oxygen vacancies on [Bi 2 O 2 ] 2+ layers. By virtue of the stronger dipole moments produced, the enhancement of intrinsic electric fields between [Bi 2 O 2 ] 2+ and halogen slabs was achieved in BiOBr 0.75 I 0.25 ; thereby the distance the photogenerated electron could diffuse was sufficient to inhibit the recombination. Our findings not only shed light on the potential properties of hybrid-halide photocatalysts but also provide a strategy for developing high efficiency catalysts.

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Section: ■ Results and Discussionmentioning

confidence: 89%

Substitution Boosts Charge Separation for High Solar-Driven Photocatalytic Performance

Zhang

Liu

et al. 2016

ACS Appl. Mater. Interfaces

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“…Such physico-chemical properties promote the use of TiO 2 mostly as photocatalyst and/or a catalytic support [3][4][5][6][7], although it is also used in dye sensitized solar cells [8][9][10][11] and, recently, in biomedical applications [12,13]. Moreover, the possibility of obtaining ordered porous structures with remarkable specific surface area (SSA) enhances the use of TiO 2 in…”

Section: Introductionmentioning

confidence: 99%

Pure and Fe-Doped Mesoporous Titania Catalyse the Oxidation of Acid Orange 7 by H2O2 under Different Illumination Conditions: Fe Doping Improves Photocatalytic Activity under Simulated Solar Light

et al. 2017

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A sample of mesoporous TiO 2 (MT, specific surface area = 150 m 2 ·g −1 ) and two samples of MT containing 2.5 wt.% Fe were prepared by either direct synthesis doping (Fe2.5-MTd) or impregnation (Fe2.5-MTi). Commercial TiO 2 (Degussa P25, specific surface area = 56 m 2 ·g −1 ) was used both as a benchmark and as a support for impregnation with either 0.8 or 2.5 wt.% Fe (Fe0.80-IT and Fe2.5-IT). The powders were characterized by X-ray diffraction, N 2 isotherms at −196 • C, Energy Dispersive X-ray (EDX) Spectroscopy, X-ray Photoelectron Spectroscopy (XPS), Diffuse Reflectance (DR) ultra-violet (UV)-Vis and Mössbauer spectroscopies. Degradation of Acid Orange 7 (AO7) by H 2 O 2 was the test reaction: effects of dark-conditions versus both UV and simulated solar light irradiation were considered. In dark conditions, AO7 conversion was higher with MT than with Degussa P25, whereas Fe-containing samples were active in a (slow) Fenton-like reaction. Under UV light, MT was as active as Degussa P25, and Fe doping enhanced the photocatalytic activity of Fe2.5-MTd; Fe-impregnated samples were also active, likely due to the occurrence of a photo-Fenton process. Interestingly, the Fe2.5-MTd sample showed the best performance under solar light, confirming the positive effect of Fe doping by direct synthesis with respect to impregnation.

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“…Also, TiO 2 nanoparticles deposited on textile fibers show antibacterial and self-cleaning activities [7,8]. Recently, new approaches for creating and utilizing bioinorganic composites of nanoscale TiO 2 have been extensively investigated for biomedical applications [9]. It is well known that the bulk TiO 2 material appears in three major crystal phases: rutile (tetragonal), anatase (tetragonal) and brookite (rhombohedral).…”

Section: Introductionmentioning

confidence: 99%

Visible light absorption of surface modified TiO2 powders with bidentate benzene derivatives

Milićević

Đorđević

Lončarević

et al. 2015

Microporous and Mesoporous Materials

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TiO 2 powders with different specific surface area were prepared using reproducible, sol-gel synthetic route and their ability to form hybrids with catechol and 5-amino salicylic acid was compared with the commercially available Degussa P25 TiO 2 powder. Microstructural characterization involving transmission electron microscopy, X-ray diffraction analysis and nitrogen adsorption-desorption isotherms indicated that TiO 2 samples cover reasonably wide size and/or specific surface area range (50-115 m 2 /g). The surface modification of TiO 2 powders with catechol and 5-amino salicylic acid induced significant shift of absorption to the visible spectral region due to charge transfer complex formation. It should be emphasized that tunable optical properties of TiO 2 in powder form have never been reported in the literature. The largest red M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 shift of the absorption onset was observed for sample with the largest specific surface area upon surface modification with both ligands. The binding of the modifier molecules to the surface Ti atoms was studied using Fourier transform infrared spectroscopy.

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Titanium Dioxide in the Service of the Biomedical Revolution

Cited by 261 publications

References 174 publications

Substitution Boosts Charge Separation for High Solar-Driven Photocatalytic Performance

Substitution Boosts Charge Separation for High Solar-Driven Photocatalytic Performance

Pure and Fe-Doped Mesoporous Titania Catalyse the Oxidation of Acid Orange 7 by H2O2 under Different Illumination Conditions: Fe Doping Improves Photocatalytic Activity under Simulated Solar Light

Visible light absorption of surface modified TiO2 powders with bidentate benzene derivatives

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