Transmigration of titanium dioxide (TiO2) particles in rats after inhalation exposure

As anionic surfactant, a commercial salt of lauryl sodium sulfate was used. The effects of different amounts of dispersant on the measurement of particle size distribution between two titanium dioxide powders (anatase and rutile) in aqueous media were discussed. Diluted aqueous suspensions were characterized in terms of particle size distribution and zeta potential. The results demonstrate that the measurement of particle size distribution strongly depends on the amounts of dispersant. The amounts of dispersant have a significant effect on the behavior of the rutile-TiO2 particles. The particle size first decreases significantly with an increase in the amounts of dispersant and then lesser increases with a further increase in the amounts of dispersant. The tendency show significant differences between two particles.

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Maternal titanium dioxide nanomaterial inhalation exposure compromises placental hemodynamics

Toxicology and Applied Pharmacology ◽

10.1016/j.taap.2019.01.024 ◽

2019 ◽

Vol 367 ◽

pp. 51-61 ◽

Cited By ~ 8

Author(s):

Alaeddin B. Abukabda ◽

Elizabeth C. Bowdridge ◽

Carroll R. McBride ◽

Thomas P. Batchelor ◽

William T. Goldsmith ◽

...

Keyword(s):

Titanium Dioxide ◽

Inhalation Exposure

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Lung injury study by 15 days inhalation exposure of titanium dioxide nanoparticles in rats

Toxicology Letters ◽

10.1016/j.toxlet.2009.06.647 ◽

2009 ◽

Vol 189 ◽

pp. S186 ◽

Cited By ~ 4

Author(s):

Kyuhong Lee ◽

Young-Su Yang ◽

Soon-Jin Kwon ◽

Jin-Su Lee ◽

Seung-Jin Choi ◽

...

Keyword(s):

Titanium Dioxide ◽

Lung Injury ◽

Titanium Dioxide Nanoparticles ◽

Inhalation Exposure

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Preparation of WOx-TiO2 and the Photocatalytic Activity under Visible Irradiation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.1979 ◽

2007 ◽

Vol 336-338 ◽

pp. 1979-1982 ◽

Cited By ~ 4

Author(s):

Hai Yan Song ◽

Hong Fu Jiang ◽

Xing Qin Liu ◽

Yin Zhu Jiang ◽

Guang Yao Meng

Keyword(s):

Aqueous Solution ◽

Titanium Dioxide ◽

Photocatalytic Activity ◽

Visible Light ◽

Tungsten Oxide ◽

Tungsten Oxides ◽

Tio2 Particles ◽

Visible Light Range ◽

Visible Irradiation ◽

Doped Titanium Dioxide

Nanocrystalline tungsten oxide doped titanium dioxide (WOx-TiO2) powders were prepared by TiCl4 hydrolysis and characterized by XRD, XPS, UV–Vis absorption spectra and TEM. Results showed that WOx not only hindered the growth of TiO2 particles but also greatly increased the transformation temperature (>800 oC) from anatase to rutile during sintering; the dominant fraction of tungsten oxides was non-stoichiometric tungsten oxide (WxOy) with Wn+ (4<n<6), which could easily substitute Ti4+ in the lattice of TiO2. The light absorption band of TiO2 changed from the near UV to the visible light range (2.68 eV in 1.0 %WOx-TiO2) because of the tungsten impurity energy level induced by WxTi1-xO2. The photocatalysis experiments demonstrated that the MB in aqueous solution was successfully degraded within 1h using WOx-TiO2 with an optimal WOx dosage of 1% under visible light irradiation.

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Spectroscopic Studies of Pyrene Adsorbed to Titanium Dioxide from Water- Alcohol Mixtures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.781-784.178 ◽

2013 ◽

Vol 781-784 ◽

pp. 178-181

Author(s):

Xing Jin ◽

Ji Lan Lian

Keyword(s):

Titanium Dioxide ◽

Spectroscopic Studies ◽

Spectral Measurement ◽

Tio2 Surface ◽

Tio2 Particles ◽

Ultraviolet Excitation ◽

Alcohol Mixture ◽

Fluorescence Characteristics ◽

Alcohol Mixtures ◽

Water Alcohol

Pyrene was adsorbed to a TiO2 surface from water-alcohol mixture solutions at 25°C and pyrene-TiO2 particles were recovered by filtration. We found that the surface of TiO2 thus recovered is relatively hydrophobic and pyrene is not decomposed but keep its fluorescence characteristics on the spectral measurement under ultraviolet excitation.

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Photocatalytic mineralisation of perchloroethylene using titanium dioxide

Water Science & Technology ◽

10.2166/wst.1995.0343 ◽

1995 ◽

Vol 31 (9) ◽

pp. 47-54 ◽

Cited By ~ 8

Author(s):

Hani Gupta ◽

Shuzo Tanaka

Keyword(s):

Titanium Dioxide ◽

Lag Time ◽

Order Reaction ◽

Co2 Production ◽

First Order ◽

Tio2 Particles ◽

Initial Ph ◽

Wide Ph Range ◽

Catalyst Dosage ◽

Ph Range

The photocatalytic mineralisation of perchloroethylene (PCE) is demonstrated mainly in terms of CO2 formation to investigate the effects of various factors such as dissolved oxygen (DO), titanium dioxide semiconductor (TiO2) catalyst dosage, PCE concentration and pH on PCE photocatalysis. PCE was rapidly adsorbed onto the TiO2 particles followed by its gradual degradation, and CO2 production started after a short lag time that corresponded to the adsorption phase. The rate of CO2 formation increased with increasing DO, TiO2 dosage and PCE concentration. There was no significant effect of initial pH on the CO2 production rate over a wide pH range. The dependence of the CO2 formation on PCE concentration was found to obey the Langmuir-Hinshelwood model. No intermediates were detected during PCE degradation and PCE degradation followed a first-order reaction.

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Inhalation Exposure Study of Titanium Dioxide Nanoparticles with a Primary Particle Size of 2 to 5 nm

Environmental Health Perspectives ◽

10.1289/ehp.9469 ◽

2007 ◽

Vol 115 (3) ◽

pp. 397-402 ◽

Cited By ~ 269

Author(s):

Vicki H. Grassian ◽

Patrick T. O’Shaughnessy ◽

Andrea Adamcakova-Dodd ◽

John M. Pettibone ◽

Peter S. Thorne

Keyword(s):

Particle Size ◽

Titanium Dioxide ◽

Primary Particle ◽

Titanium Dioxide Nanoparticles ◽

Inhalation Exposure ◽

Primary Particle Size ◽

Exposure Study

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Inactivation of Escherichia Coli on Titanium Dioxide Photocatalysis Nanoparticles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.96.99 ◽

2010 ◽

Vol 96 ◽

pp. 99-104 ◽

Cited By ~ 3

Author(s):

Jing Wang ◽

Zhi Jiang Ji ◽

Zhong He Shui ◽

Xiao Yan Wang ◽

Nan Ding ◽

...

Keyword(s):

Escherichia Coli ◽

Titanium Dioxide ◽

Cell Membrane ◽

Particle Diameter ◽

Average Diameter ◽

Nano Tio2 ◽

E Coli ◽

Tio2 Particles ◽

Titanium Dioxide Photocatalysis ◽

The Difference

The effects of P25 TiO2 made by DEGUSSA and one kind nano-titanium dioxide made by a certain company in China (Expressed by Tc) on Escherichia coli were tested by the minimal inhibitory concentration (MIC) method, and the status dispersed of two kinds nano-TiO2 and the micro-phenomenon of the effect on Escherichia coli were observed by scanning electron microscope (SEM). The hydroxyl radical (•OH) signal intensity in liquid produced by nano-TiO2 was tested by electron spinning resonance (ESR). It was found that the MIC of the P25 and Tc were 500 mg/L and 5 g/L, respectively. The cells of E. coli which were attached by the nano-TiO2 particles were damaged strongly, and the membrane was dissolved and dispersed under SEM. The intensity of •OH signal produced by P25 was stronger than that of Tc tested by ESR. The size of E. coli was 0.4~0.7×1~3 µm, and the average diameter of nano-TiO2 was 20 nm. When the nano-TiO2 particles touch the E. coli, it would stick to the surface of the cell wall and destroy the cell membrane, lead to the canker of cell membrane and the outflow of cytoplasm. The difference of the MIC between the two kinds of nano-powders may be due to their dispersion degree and the particle diameter which influence the •OH production.

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