Mineral-Induced Formation of Reactive Oxygen Species

Schoonen, Martin A. A.; Cohn, Corey A.; Roemer, Elizabeth; Laffers, Richard; Simon, Sanford R.; O’Riordan, Thomas G.

doi:10.2138/rmg.2006.64.7

Cited by 164 publications

(154 citation statements)

References 217 publications

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“…Iron in the lung can be used for microbial growth and replication, resulting in more virulent and persistent infections (Turi et al, 2004). The rate of reaction between oxygen and ferrous iron in goethite mineral present in dust is particularly high (Schoonen et al, 2006).…”

Section: Minerals and Healthmentioning

confidence: 99%

Technical Note: High-resolution mineralogical database of dust-productive soils for atmospheric dust modeling

et al. 2012

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Abstract. Dust storms and associated mineral aerosol transport are driven primarily by meso-and synoptic-scale atmospheric processes. It is therefore essential that the dust aerosol process and background atmospheric conditions that drive dust emissions and atmospheric transport are represented with sufficiently well-resolved spatial and temporal features. The effects of airborne dust interactions with the environment determine the mineral composition of dust particles. The fractions of various minerals in aerosol are determined by the mineral composition of arid soils; therefore, a high-resolution specification of the mineral and physical properties of dust sources is needed.Several current dust atmospheric models simulate and predict the evolution of dust concentrations; however, in most cases, these models do not consider the fractions of minerals in the dust. The accumulated knowledge about the impacts of the mineral composition in dust on weather and climate processes emphasizes the importance of including minerals in modeling systems. Accordingly, in this study, we developed a global dataset consisting of the mineral composition of the current potentially dust-producing soils. In our study, we (a) mapped mineral data to a high-resolution 30 s grid, (b) included several mineral-carrying soil types in dust-productive regions that were not considered in previous studies, and (c) included phosphorus.

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Section: Minerals and Healthmentioning

confidence: 99%

Technical Note: High-resolution mineralogical database of dust-productive soils for atmospheric dust modeling

et al. 2012

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“…It is deduced that the high catalytic efficiency of the FeOOH/TiO2 composite originates from the unique relative band positions of these two semiconductors. [30][31][32][33] Figure 5 describes a schematic diagram for the energy band position of FeOOH and TiO2. Differently from most of semiconductors, VB level of FeOOH (-7.68 eV) is relatively lower than that of TiO2 (-7.41 eV).…”

Section: Resultsmentioning

confidence: 99%

“…[30][31][32][33] In this work, we prepared the FeOOH/TiO 2 heterojunctions by coupling FeO-OH and Degussa P25 nanoparticles using an organic linker. The photocatalytic behavior of FeOOH/TiO2 composites in decomposing gaseous 2-propanol was investigated, and the mechanistic role of FeOOH was also discussed.…”

Section: Introductionmentioning

confidence: 99%

Heterojunction of FeOOH and TiO₂for the Formation of Visible Light Photocatalyst

Rawal¹,

Chakraborty²,

Lee

2009

Bulletin of the Korean Chemical Society

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FeOOH/TiO2, a heterojunction structure between FeOOH and TiO2, was prepared by covering the surface of the ~100-nm-sized FeOOH particles with Degussa P25 by applying maleic acid as an organic linker. Under visible light irradiation (λ ≥ 420 nm), FeOOH/TiO2 showed a notable photocatalytic activity in removal of gaseous 2-propanol and evolution of CO2. It was found that FeOOH reveals a profound absorption in the spectral range of 400 -550 nm, and its valence band (VB) level is located relatively lower than that of TiO2. The considerable photocatalytic efficiency of the FeOOH/TiO2 under visible light irradiation was therefore deduced to be caused by the hole transfer between the VB of FeOOH and TiO2.

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“…Having a standard redox potential in water E° = 0.77 V, iron ions may catalyze the formation of ROS, e.g., by generating hydroxyl radicals through reaction with hydrogen peroxide (Fenton reaction), which may in turn induce oxidative stress. This may occur not only if the ions are mobilized in biofluids but also if they are bound to the surface of particles (Shoonen et al 2006;. The association of iron to TiO 2 nanoparticles is a peculiar case.…”

Section: Discussionmentioning

confidence: 99%

Inhibition of the ROS-mediated cytotoxicity and genotoxicity of nano-TiO2 toward human keratinocyte cells by iron doping

et al. 2014

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Inhibition of the ROS-mediated cytotoxicity and genotoxicity of nano-TiO 2 toward human keratinocyte cells by iron doping J Nanopart Res (2014) Nano-TiO 2 powders are widely used in sunscreen lotions as UV filters in combination with other substances. The activation of TiO 2 by UV rays leads to the release of reactive oxygen species (ROS, e.g., hydroxyl radicals and singlet oxygen) which are potentially harmful. For this reason the TiO 2 particles are generally coated with inert materials (e.g., silica or alumina) that inhibit such reactivity. Alternatively, the release of ROS may be inhibited by introducing in the TiO 2 lattice doping elements. In the present study we report a new modification consisting in a wet impregnation of TiO 2 with iron salts followed by a thermal treatment that results in an inhibition of the surface reactivity. The insertion of iron ions also gradually reduces the ability of photo-activated TiO 2 to cleave DNA and proteins. At the same time, a clear inhibition of cyto-and geno-toxicity toward human (HaCaT) keratinocytes was observed. The data presented herein suggest the insertion of Fe 3+ ions at the surface of nano-TiO 2 as a promising strategy to reduce the photo-induced toxicity of nano-TiO 2 powders.

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Mineral-Induced Formation of Reactive Oxygen Species

Cited by 164 publications

References 217 publications

Technical Note: High-resolution mineralogical database of dust-productive soils for atmospheric dust modeling

Technical Note: High-resolution mineralogical database of dust-productive soils for atmospheric dust modeling

Heterojunction of FeOOH and TiO₂for the Formation of Visible Light Photocatalyst

Inhibition of the ROS-mediated cytotoxicity and genotoxicity of nano-TiO2 toward human keratinocyte cells by iron doping

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Mineral-Induced Formation of Reactive Oxygen Species

Cited by 164 publications

References 217 publications

Technical Note: High-resolution mineralogical database of dust-productive soils for atmospheric dust modeling

Technical Note: High-resolution mineralogical database of dust-productive soils for atmospheric dust modeling

Heterojunction of FeOOH and TiO2for the Formation of Visible Light Photocatalyst

Inhibition of the ROS-mediated cytotoxicity and genotoxicity of nano-TiO2 toward human keratinocyte cells by iron doping

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Heterojunction of FeOOH and TiO₂for the Formation of Visible Light Photocatalyst