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

Effect of ionic strength on the aggregation kinetics of the amidated amyloid beta peptide Aβ (1-40) in aqueous solutions

2017 ◽  
Vol 228 ◽  
pp. 98-107 ◽  
Author(s):  
Adriana Campos-Ramírez ◽  
Maripaz Márquez ◽  
Liliana Quintanar ◽  
Luis F. Rojas-Ochoa
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Amyloid Beta ◽  
Amyloid Beta Peptide ◽  
Aggregation Kinetics ◽  
Beta Peptide ◽  
Kinetics Of

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.

scholarly journals Dose-dependent clearance kinetics of intratracheally administered titanium dioxide nanoparticles in rat lung

Toxicology ◽  
2014 ◽  
Vol 325 ◽  
pp. 1-11 ◽  
Author(s):  
Naohide Shinohara ◽  
Yutaka Oshima ◽  
Toshio Kobayashi ◽  
Nobuya Imatanaka ◽  
Makoto Nakai ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Rat Lung ◽  
Clearance Kinetics ◽  
Kinetics Of ◽  
Dose Dependent

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>

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