Principles of TiO2 Photocatalysis

Castellote, Marta; Bengtsson, Nicklas

doi:10.1007/978-94-007-1297-3_2

Cited by 59 publications

(36 citation statements)

References 6 publications

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“…Hydroxyl groups also play an important role in protein adsorption and can increase the chemical interactions between osteoblasts and titanium surfaces . Irradiation with UV‐C as well as non‐thermal plasma may be able to induce a one‐electron oxidation with water from the atmosphere on the surface of the material to produce a hydroxyl radical and a hydrogen ion, which is subsequently able to form another hydroxyl group at the surface . This may explain the super‐hydrophilic effect on zirconia in this study that was induced by the introduction of hydroxyl groups by non‐thermal plasma.…”

Section: Discussionmentioning

confidence: 76%

Changes in surface characteristics of titanium and zirconia after surface treatment with ultraviolet light or non‐thermal plasma

Henningsen

Smeets

Heuberger

et al. 2018

European J Oral Sciences

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Positive effects of irradiation with ultraviolet (UV) light or treatment with non-thermal plasma on titanium and zirconia surfaces have been described in various studies. The aim of this study was to assess and compare the changes in the physicochemical surface conditions of titanium and zirconia surfaces after a short treatment with UV light or with non-thermal plasmas of argon or oxygen. Titanium and zirconia samples with moderately rough surfaces were treated for 12 min either in a UV-light oven or in a non-thermal plasma reactor that generates non-thermal plasmas of oxygen or argon. Changes in surface conditions were assessed by confocal microscopy, dynamic contact angle measurement, and X-ray photoelectron spectroscopy (XPS). No changes in roughness occurred. Ultraviolet irradiation and non-thermal plasma significantly increased the wettability of the titanium and zirconia surfaces. X-ray photoelectron spectroscopy showed an increase of oxygen and a significant decrease of carbon after treatment with either method. Thus, ultraviolet light and non-thermal plasma were found to be able to improve the chemical surface conditions of titanium and zirconia following a short exposure time. However, further in vitro and in vivo studies are needed to determine the relevance of the results.

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Section: Discussionmentioning

confidence: 76%

Changes in surface characteristics of titanium and zirconia after surface treatment with ultraviolet light or non‐thermal plasma

Henningsen

Smeets

Heuberger

et al. 2018

European J Oral Sciences

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“…The primary species involved in oxidative degradation of RhB dye are superoxide radical ions (O 2 ·(−) ) and hydroxyl radicals . Out of these two, the hydroxyl radicals are more reactive and have a half life span of 10 −9 second only.…”

Section: Resultsmentioning

confidence: 99%

“…) and hydroxyl radicals (34). Out of these two, the hydroxyl radicals are more reactive and have a half life span of 10 À9 second only.…”

Section: á(à)mentioning

confidence: 99%

Silver‐Doped TiO₂‐Coated Cotton Fabric as an Effective Photocatalytic System for Dye Decolorization in UV and Visible Light

Mishra¹,

Butola

2018

Photochem & Photobiology

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In this study, titanium tetra-isopropoxide was used as a precursor of TiO for in situ coating on cotton fabric by sol-gel method. Subsequently, silver nitrate was used as doping agent to prepare silver-doped TiO -coated cotton fabric during hydrothermal treatment. The treated samples were characterized through field-emission scanning electron microscopy, energy-dispersive X-ray analysis, inductively coupled plasma-mass spectroscopy and UV-visible absorption spectroscopy to study morphology, composition of deposited elements and light absorption behavior of treated samples. X-ray photoelectron spectroscopy was carried out to analyze the electronic state of silver in TiO -coated fabric after hydrothermal treatment. Doping of silver on TiO -coated fabric and subsequent hydrothermal treatment was found to enhance dye decolorization rate of rhodamine B dye solution in both UV and visible light radiations with respect to undoped TiO . The study shows that an optimal level of silver-doped TiO -coated fabric can be used repeatedly for dye decolorization without significant loss in its photocatalytic activity. The self-cleaning properties of samples were also studied using methylene blue as a staining agent. It was observed that the presence of 1.8% silver on the weight of titanium in doped samples provides almost 82% of stain degradation.

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“…Titanium dioxide exists in three different crystalline structures of rutile, anatase and brookite [56]. The anatase and rutile show different structural characteristics in terms of Ti-Ti and Ti-O distances.…”

Section: Photocatalyst Characterizationmentioning

confidence: 99%

Comparative Study of Four TiO2-Based Photocatalysts to Degrade 2,4-D in a Semi-Passive System

Heydari

Hollman

Achari

et al. 2019

Water

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In this study, the relative efficiency of four forms of supported titanium dioxide (TiO2) as a photocatalyst to degrade 2,4-dichlorophenoxyacetic acid (2,4-D) in Killex®, a commercially available herbicide was studied. Coated glass spheres, anodized plate, anodized mesh, and electro-photocatalysis using the anodized mesh were evaluated under an ultraviolet – light-emitting diode (UV-LED) light source at λ = 365 nm in a semi-passive mode. Energy consumption of the system was used to compare the efficiency of the photocatalysts. The results showed both photospheres and mesh consumed approximately 80 J/cm3 energy followed by electro-photocatalysis (112.2 J/cm3), and the anodized plate (114.5 J/cm3). Although electro-photocatalysis showed the fastest degradation rate (K = 5.04 mg L−1 h−1), its energy consumption was at the same level as the anodized plate with a lower degradation rate constant of 3.07 mg L−1 h−1. The results demonstrated that three-dimensional nanotubes of TiO2 surrounding the mesh provide superior degradation compared to one-dimensional arrays on the planar surface of the anodized plate. With limited broad-scale comparative studies between varieties of different TiO2 supports, this study provides a comparative analysis of relative degradation efficiencies between the four photocatalytic configurations.

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Principles of TiO2 Photocatalysis

Cited by 59 publications

References 6 publications

Changes in surface characteristics of titanium and zirconia after surface treatment with ultraviolet light or non‐thermal plasma

Changes in surface characteristics of titanium and zirconia after surface treatment with ultraviolet light or non‐thermal plasma

Silver‐Doped TiO₂‐Coated Cotton Fabric as an Effective Photocatalytic System for Dye Decolorization in UV and Visible Light

Comparative Study of Four TiO2-Based Photocatalysts to Degrade 2,4-D in a Semi-Passive System

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Principles of TiO2 Photocatalysis

Cited by 59 publications

References 6 publications

Changes in surface characteristics of titanium and zirconia after surface treatment with ultraviolet light or non‐thermal plasma

Changes in surface characteristics of titanium and zirconia after surface treatment with ultraviolet light or non‐thermal plasma

Silver‐Doped TiO2‐Coated Cotton Fabric as an Effective Photocatalytic System for Dye Decolorization in UV and Visible Light

Comparative Study of Four TiO2-Based Photocatalysts to Degrade 2,4-D in a Semi-Passive System

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Silver‐Doped TiO₂‐Coated Cotton Fabric as an Effective Photocatalytic System for Dye Decolorization in UV and Visible Light