Interaction of titanium dioxide nanoparticles with kaolinite clay particles in the presence of quartz sand

2020 ◽  
Author(s):  
Constantinos V. Chrysikopoulos ◽  
Dimitra Fasouletou
Keyword(s):  
Titanium Dioxide ◽  
Ionic Strength ◽  
Titanium Dioxide Nanoparticles ◽  
Rapid Development ◽  
Consumer Products ◽  
Engineered Nanoparticles ◽  
Kaolinite Clay ◽  
Clay Particles ◽  
Water Saturated ◽  
Experimental And Theoretical Studies

<p>Titanium dioxide (TiO<sub>2</sub>) is one of the most frequently employed nanoparticles (NPs) in consumer products. The rapid development of nanotechnology has led to the inevitable introduction of NPs in the natural environment, which subsequently may reach underground formations. Also, kaolinite is one of the most common minerals, which can be found in the subsurface. Numerous experimental and theoretical studies have shown that kaolinite clay particles can impact on the transport behavior of colloids, biocolloids (bacteria, viruses) and engineered nanoparticles. Therefore, the aim of this study is to examine the interaction of kaolinite (KGa-1b) particles with suspended TiO<sub>2 </sub>NPs in the presence of quartz sand.Static and dynamic batch experiments were performed with three different TiO<sub>2 </sub>concentrations (50, 100, 200 mg/L) and four different ionic strength values ​​(1, 25, 50, 100 mM). All of the experiments were conducted at room temperature (22 °C) and pH=7.The experimental results clearly suggested that TiO<sub>2 </sub>attachment onto KGa-1b particles was slightly enhanced with increasing TiO<sub>2 </sub>concentrations,but significantly increased with increasing ionic strength. Consequently, the presence of suspended KGa-1b particles can retard the TiO<sub>2 </sub>transport in water saturated porous media.</p>

scholarly journals Impact of Titanium Dioxide Nanoparticles on Cd Phytotoxicity and Bioaccumulation in Rice (Oryza sativa L.)

2020 ◽  
Vol 17 (9) ◽  
pp. 2979 ◽  
Author(s):  
Wei Zhang ◽  
Jinghua Long ◽  
Jianmin Geng ◽  
Jie Li ◽  
Zhongyi Wei
Keyword(s):  
Titanium Dioxide ◽  
Oryza Sativa ◽  
Plant Height ◽  
Oryza Sativa L ◽  
Titanium Dioxide Nanoparticles ◽  
Engineered Nanoparticles ◽  
Control Treatment ◽  
Booting Stage ◽  
Tio2 Nps ◽  
The Impact

The impact of engineered nanoparticles (ENPs) on the migration and toxicity of coexisting pollutants is still unclear, especially in soil media. This study aims to evaluate the impact of titanium dioxide nanoparticles (TiO2 NPs) on the phytotoxicity of cadmium (Cd) to Oryza sativa L., and the migration of cadmium (Cd) in the soil-rice system. Three different Cd stress groups (C1 group: 1.0 mg kg−1, C2 group: 2.5 mg kg−1 and C3 group: 5.0 mg kg−1) were set in the pot experiment, and the target concentration of TiO2 NPs in each group were 0 mg kg−1 (T0), 50 mg kg−1 (T1), 100 mg kg−1 (T2) and 500 mg kg−1 (T3). Plant height and biomass decreased with the increasing of Cd content in paddy soil. TiO2 NPs could lower the phytotoxicity of Cd in terms of the changes in the morphological and biochemical characteristics, especially in the tillering and booting stage. In the tillering stage, TiO2 NPs addition caused a significant increase in plant height, biomass and the total chlorophyll content in the leaves of Oryza saliva L. In the booting stage, TiO2 NPs addition caused a 15% to 32% and 24% to 48% reduction of malondialdehyde (MDA) content for the C2 and C3 group, respectively, compared to that of the respective control treatment (T0). TiO2-NPs addition reduced the activity of peroxidase (POD) in the leaves in the booting and heading stage, and the activity of catalase (CAT) in the tillering stage. In the C1 and C2 group, the grain Cd content in the 100 and 500 mg kg−1 TiO2 NPs treatments reached 0.47–0.84 mg kg−1, obviously higher than that of the treatment without TiO2 NPs (0.27–0.32 mg kg−1), suggesting that TiO2-NPs could promote Cd migration in the soil-rice system.

Influence of Ionic Strength, pH, and Cation Valence on Aggregation Kinetics of Titanium Dioxide Nanoparticles

2009 ◽  
Vol 43 (5) ◽  
pp. 1354-1359 ◽  
Author(s):  
Rebecca A. French ◽  
Astrid R. Jacobson ◽  
Bojeong Kim ◽  
Sara L. Isley ◽  
R. Lee Penn ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Ionic Strength ◽  
Titanium Dioxide Nanoparticles ◽  
Aggregation Kinetics ◽  
Kinetics Of

scholarly journals Titanium dioxide nanoparticles exacerbate allergic airway inflammation via TXNIP upregulation in a mouse model of asthma

2021 ◽  
Author(s):  
Je-Oh Lim ◽  
Se-Jin Lee ◽  
Woong-Il Kim ◽  
So-Won Pak ◽  
Changjong Moon ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Epithelial Cells ◽  
Mouse Model ◽  
Inflammatory Mediators ◽  
Titanium Dioxide Nanoparticles ◽  
B Cell Lymphoma ◽  
Airway Epithelial Cells ◽  
Consumer Products ◽  
Airway Epithelial ◽  
Apoptosis Pathway

Abstract Background Titanium dioxide nanoparticles (TiO2NPs) are widely used in the fields of industry and medicine and in various consumer products. With the increasing use of TiO2NPs, there has been an increase in the number of toxicity studies; however, studies investigating the mechanism underlying its toxicity are very rare. In this study, we evaluated the potential toxic effects of TiO2NPs exposure on the lungs as well as the development of asthma in ovalbumin (OVA)-induced mouse model of asthma. We also investigated the related toxic mechanism. Results TiO2NPs caused pulmonary toxicity by exacerbating the inflammatory response, indicated by an increase in the number of inflammatory cells and levels of inflammatory mediators. Exposure of mice with OVA-induced asthma to TiO2NPs led to significant increases in inflammatory mediators, cytokines, and airway hyperresponsiveness compared with non-exposed mice with asthma. This was also accompanied by an increase in inflammatory cell infiltration and mucus production in the lung tissues. TiO2NPs also decreased the expression of B-cell lymphoma 2 (Bcl2) and increased the expression of thioredoxin-interacting protein (TXNIP), phospho-apoptosis signal-regulating kinase 1, Bcl2-associated X, and cleaved-caspase 3 in the lungs of asthmatic mice compared with those of non-exposed asthmatic mice. These responses were consistent with in vitro results obtained using human airway epithelial cells. TiO2NPs treated cells exhibited an increase in the mRNA and protein expression of IL-1β, IL-6, and TNF-α with an elevation of TXNIP signaling compared to non-treated cells. Moreover, pathophysiological changes induced by TiO2NPs treatment were significantly decreased by TXNIP knockdown in the airway epithelial cells. Conclusion Taken together, TiO2NPs exposure induced toxicological changes in the respiratory tract and exacerbated the development of asthma via activation of the TXNIP-apoptosis pathway. These results provide insights into the mechanism underlying TiO2NPs-mediated respiratory toxicity.

scholarly journals Optimization of the procedure for efficient dispersion of titanium dioxide nanoparticles in aqueous samples

2016 ◽  
Vol 8 (5) ◽  
pp. 1194-1201 ◽  
Author(s):  
Janja Vidmar ◽  
Radmila Milačič ◽  
Viviana Golja ◽  
Saša Novak ◽  
Janez Ščančar
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Consumer Products ◽  
Aqueous Samples

The widespread use of titanium dioxide nanoparticles (TiO2NPs) in consumer products has led to an increase of their concentrations in the environment.

Removal of titanium dioxide nanoparticles by coagulation: effects of coagulants, typical ions, alkalinity and natural organic matters

2013 ◽  
Vol 68 (5) ◽  
pp. 1137-1143 ◽  
Author(s):  
H. T. Wang ◽  
Y. Y. Ye ◽  
J. Qi ◽  
F. T. Li ◽  
Y. L. Tang
Keyword(s):  
Titanium Dioxide ◽  
Ionic Strength ◽  
Natural Organic Matter ◽  
Titanium Dioxide Nanoparticles ◽  
Potential Hazard ◽  
Experimental Conditions ◽  
Polyaluminum Chloride ◽  
Tio2 Nps ◽  
Natural Organic Matters ◽  
Polyferric Sulfate

To investigate the possibility of removing titanium dioxide nanoparticles (TiO2 NPs) from water by coagulation, as well as to find the optimal coagulant and experimental conditions for TiO2 NP removal, four types of coagulant were adopted: polyferric sulfate (PFS), ferric chloride (FeCl3), polyaluminum chloride (PACl), and alum (Al2(SO4)3). It was found that the removal of TiO2 NPs by coagulation was affected by ionic strength, alkalinity, as well as types and dosages of coagulants. PFS and FeCl3 achieved much higher removal efficiency of TiO2 NPs than PACl and Al2(SO4)3 did. For 30 mg/L TiO2 NPs, a dosage of 0.3 mM PFS (as Fe) achieved 84% removal after coagulation followed by 30 min settlement. Optimal ionic strength (0.1 M NaCl or 0.03 M CaCl2) is of vital importance for the performance of PFS. Na2SO4 is unfavorable for the performance of PFS. Optimal alkalinity (0.01–0.03 M NaHCO3) is necessary for FeCl3 to remove TiO2 NPs. Natural organic matter, as represented by humic acid (HA) up to 11 mg/L, reduces the removal of TiO2 NPs by coagulation. These findings indicate that coagulation is a good option for the removal of TiO2 NPs from water, and more attention should be paid to the effects of water quality when using coagulation to remove TiO2 NPs from aqueous matrices. This provides a possible solution to alleviate the potential hazard caused by TiO2 NPs.

Titanium dioxide nanoparticles and the oral uptake-route

2013 ◽  
Vol 14 (1-2) ◽  
pp. 25-35 ◽  
Author(s):  
Eleonore Fröhlich ◽  
Birgit Johanna Teubl ◽  
Eva Roblegg
Keyword(s):  
Titanium Dioxide ◽  
Risk Evaluation ◽  
Titanium Dioxide Nanoparticles ◽  
Consumer Products ◽  
Cell Entry ◽  
Mucus Layer ◽  
Food Sector ◽  
Pharmaceutical Dosage Forms ◽  
Oral Uptake ◽  
Human Risk

AbstractTitanium dioxide (TiO2) is a common additive that is increasingly used in consumer products, food, pharmaceutical dosage forms and cosmetic articles. However, due to size reduction of TiO2 particles from the microscale to the nanoscale, application areas of this material are expanding, especially in the food sector, which makes investigations of nano-TiO2 crucial. This review focuses on two important topics of current research regarding the oral pathway: 1) anatomy of the orogastrointestinal tract, composition of epithelial and mucus layer, and pH changes; 2) cell entry mechanisms, cytotoxicity and translocation. Sufficient knowledge on the oral uptake route is not yet available but is highly needed for human risk evaluation.

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