Photocatalytic oxidation of n-butanol under fluorescent visible light lamp over commercial TiO2 (Hombicat UV100 and Degussa P25)

Kirchnerová, J.; Cohen, Marvin L.; Guy, Christophe; Klvana, D.

doi:10.1016/j.apcata.2004.12.045

Cited by 86 publications

(50 citation statements)

References 27 publications

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“…Number concentration of TiO 2 based on the primary particle size can be calculated if TiO 2 particles are assumed to be spherical. The average radius of primary TiO 2 particles (r t ) was 15 nm [37,38] and the density (ρ t ) was 3.9 g/cm 3 (P25 containing approximately 75% of anatase and 25% of rutile) [38] . The experiments were conducted at a constant ionic strength (1 mmol/L NaCl) and several different pH values: 4.2, 5.4, 6.9, 7.3 and 9.2, which were adjusted with HCl, NaHCO 3 and Na 2 CO 3 .…”

Section: Exposure Of Algae To Tiomentioning

confidence: 99%

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Lin

Tseng²,

Huang

2015

Front. Chem. Sci. Eng.

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Nano-sized titanium dioxide (nano-TiO 2 ) has wide industrial applications and therefore considerable chances of exposure are created for human beings and ecosystems. To better understand the interactions between nano-TiO 2 and aquatic organisms, we first studied TiO 2 uptake by algae exemplified by Pseudokirchneriella subcapitata. P. subcapitata were exposed to nano-TiO 2 in a series of concentrations and at various pH. TiO 2 uptake was quantified using a sedimentation curve analysis technique. After exposure of algae to TiO 2 , the variation of zeta potential was measured and the morphology of algae-TiO 2 aggregate was observed with scanning electron microscopy and the optical microscopy. The steady-state TiO 2 uptake was found to be pH-dependent and the isotherms can be described well by Freundlich model. TiO 2 deposited on algal surfaces causes the shift of pH zpc of TiO 2 -covered algae from that of algae toward that of TiO 2 . The attraction between TiO 2 -covered algal cells induces the agglomeration of algae and TiO 2 and thus the formation of algae-TiO 2 aggregates in the size of 12 to 50 µm. The 2-D fractal dimension of the aggregates is pHdependent and ranges from 1.31 to 1.67. The theoretical analysis of the Gibbs energy of interaction indicates that both TiO 2 uptake by algae and the formation of algae-TiO 2 aggregate are influenced by the interaction between TiO 2 particles.

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Section: Exposure Of Algae To Tiomentioning

confidence: 99%

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Lin

Tseng²,

Huang

2015

Front. Chem. Sci. Eng.

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“…Crystal phase identification of the powders was performed using X-ray diffraction analysis (XPD) [Dionysiou et al, 2000]. The specific surface area (SSA) and particle size of the TiO 2 powders were 50 m 2 /g and 30 nm, respectively [Kirchnerova et al, 2005]. The zeta-potential of P25, measured in culture medium (pH 5 7.5) was 211.6 6 1.2 mV [Long et al, 2006].…”

Section: Chemicalsmentioning

confidence: 99%

Titanium dioxide nanoparticles trigger p53‐mediated damage response in peripheral blood lymphocytes

Kang

Kim

Lee

et al. 2008

Environ and Mol Mutagen

328

156

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Titanium dioxide nanoparticles (nano-TiO2) are widely used as a photocatalyst in air and water remediation. These nanoparticles are known to induce toxicity; however, their cytotoxic mechanism is not fully understood. In this study, we investigated the underlying mechanism of nano-TiO2-induced cytotoxicity in peripheral blood lymphocytes. We examined the genotoxic effects of nano-TiO2 in lymphocytes using alkaline single-cell gel electrophoresis (Comet) and cytokinesis-block micronucleus (CBMN) assays. Lymphocytes treated with nano-TiO2 showed significantly increased micronucleus formation and DNA breakage. Western-blot analysis to identify proteins involved in the p53-mediated response to DNA damage revealed the accumulation of p53 and activation of DNA damage checkpoint kinases in nano-TiO2-treated lymphocytes. However, p21 and bax, downstream targets of p53, were not affected, indicating that nano-TiO2 does not stimulate transactivational activity of p53. The generation of reactive oxygen species (ROS) in nano-TiO2-treated cells was also observed, andN-acetylcysteine (NAC) supplementation inhibited the level of nano-TiO2-induced DNA damage. Given that ROS-induced DNA damage leads to p53 activation in the DNA damage response, our results suggest that nano-TiO2 induces ROS generation in lymphocytes, thereby activating p53-mediated DNA damage checkpoint signals.

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“…Shen and Ku (2002) found that the addition of ozone into the TiO 2 /UV/TCE system with 254 or 365 nm UV lamps reduced the removal of TCE, possibly because excessive ozone molecules could scavenge hydroxylradicals produced from the excitation of TiO 2 by UV radiation. Kirchnerova et al (2005) explored the photocatalytic activities of two commercial TiO 2 catalysts, Degussa P25 and Hombicat UV100, for n-butanol decomposition under visible light. They found that Degussa P25 was more active than Hombicat UV100.…”

Section: Photocatalytic Oxidation (Pco)mentioning

confidence: 99%

A Review of Some Representative Techniques for Controlling the Indoor Volatile Organic Compounds

Kabir¹,

Kim²

2012

Asian J. Atmos. Environ

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Photocatalytic oxidation of n-butanol under fluorescent visible light lamp over commercial TiO2 (Hombicat UV100 and Degussa P25)

Cited by 86 publications

References 27 publications

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Interactions between nano-TiO2 particles and algal cells at moderate particle concentration

Titanium dioxide nanoparticles trigger p53‐mediated damage response in peripheral blood lymphocytes

A Review of Some Representative Techniques for Controlling the Indoor Volatile Organic Compounds

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