Sorption kinetics of cesium on hydrous titanium dioxide

2003 ◽  
Vol 91 (10) ◽  
Author(s):  
Y. Altaş ◽  
H. Tel ◽  
G. Yaprak
Keyword(s):  
Titanium Dioxide ◽  
Ion Exchange ◽  
Exchange Rates ◽  
Diffusion Coefficients ◽  
Isotopic Exchange ◽  
Sorption Kinetics ◽  
Cesium Ions ◽  
Ion Exchange Reaction ◽  
Titanium Dioxides ◽  
Kinetics Of

SummaryTwo types of hydrous titanium dioxide possessing different surface properties were prepared and characterized to study the sorption kinetics of cesium. The effect of pH on the adsorption capacity were determined in both type sorbents and the maximum adsorption percentage of cesium were observed at pH 12. To elucidate the kinetics of ion-exchange reaction on hydrous titanium dioxide, the isotopic exchange rates of cesium ions between hydrous titanium dioxides and aqueous solutions were measured radiochemically and compared with each other. The diffusion coefficients of Cs

Sorption Kinetics of High Pressure Gases in Polymeric Tubing Materials

2006 ◽  
Author(s):  
P. Jaeger ◽  
S. Buchner ◽  
R. Eggers
Keyword(s):  
Diffusion Coefficients ◽  
Gas Permeability ◽  
Gravimetric Method ◽  
Sorption Kinetics ◽  
Operating Pressure ◽  
Gas Solubility ◽  
Atmospheric Conditions ◽  
High Solubility ◽  
Industrial Practice ◽  
Kinetics Of

A gravimetric method was applied to determine the sorption kinetics of gases into polymers. Diffusivity as well as sorption capacity are determined directly. Data of gas permeability that are required for calculating leakage rates in polymeric flexile gas and oil ducts may be retrieved by multiplying the obtained diffusion coefficients and the gas solubility. In general carbon dioxide enters polymers to the highest extent. In industrial practice, the high solubility of CO2 e.g. may lead to explosive decompression of sealings once the operating pressure is reduced to atmospheric conditions. Diffusion coefficients are presented in the range of 75 to 130°C at 2 to 30 MPa.

Ion-exchange and sorption kinetics of cesium and strontium in soils

1995 ◽  
Vol 46 (9) ◽  
pp. 839-846 ◽  
Author(s):  
Dai-Chin Liu ◽  
Chun-Nan Hsu ◽  
Chi-Lung Chuang
Keyword(s):  
Ion Exchange ◽  
Sorption Kinetics ◽  
Kinetics Of

Zur Kinetik der Ionenaustauscher III. Die Filmdiffusion bei vollständigen Umbeladungen

1969 ◽  
Vol 24 (6) ◽  
pp. 900-902
Author(s):  
Kurt Bunzel
Keyword(s):  
Ion Exchange ◽  
Exchange Reaction ◽  
Exchange Process ◽  
Ionic Composition ◽  
Selectivity Coefficient ◽  
Film Diffusion ◽  
Ion Exchange Process ◽  
Ion Exchange Reaction ◽  
Diffusion Controlled ◽  
Kinetics Of

The selectivity coefficient K21 of an ion-exchange process is in general a function of the ionic composition of the material. As a result, the value of K21 will change continuously during a com­plete conversion of the ion-exchanger. Equations for the kinetics of such a conversion with variable K21 are given for a film diffusion controlled ion-exchange reaction.

wA radiochemical study of the kinetics of ion-exchange on zirconium antimonate

1977 ◽  
Vol 55 (22) ◽  
pp. 3857-3861 ◽  
Author(s):  
John Mathew ◽  
Shiv Nath Tandon
Keyword(s):  
Ion Exchange ◽  
Diffusion Coefficients ◽  
Energy Of Activation ◽  
Slow Step ◽  
Radiochemical Study ◽  
Entropy Of Activation ◽  
Kinetics Of ◽  
Kinetics Of Ion Exchange

This paper reports the radiochemical study of the kinetics of ion-exchange of Rb+ and Cs+ with H+ on zirconium antimonate. The slow step which determines the rate of exchange of these ions is diffusion through the particle. Values for the diffusion coefficients, energy of activation, and entropy of activation have been calculated. The data obtained have been compared with those reported for other organic and inorganic exchangers.

scholarly journals Determination, Modeling and Evaluation of Kinetics of 223Ra Sorption on Hydroxyapatite and Titanium Dioxide Nanoparticles

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1915 ◽  
Author(s):  
Petra Suchánková ◽  
Ekaterina Kukleva ◽  
Karel Štamberg ◽  
Pavel Nykl ◽  
Michal Sakmár ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Sorption Kinetics ◽  
Point Of View ◽  
Particle Therapy ◽  
Radium 223 ◽  
Free Air ◽  
In Vivo Generator ◽  
Kinetics Of

Sorption kinetics of radium on hydroxyapatite and titanium dioxide nanomaterials were studied. The main aim of the current study was to determine the rate-controlling process and the corresponding kinetic model, due to the application of studied nanomaterials as α-emitters’ carriers, and to assess the sorption properties of both materials from the radiopharmaceutical point of view by time regulated sorption experiments on the nanoparticles. Radium-223 was investigated as radionuclide used in targeted alpha particle therapy as an in vivo generator. It was found that the controlling process of the 223Ra sorption kinetics was the diffusion in a reacted layer. Therefore, parameters like particle size, their specific surface area, contact time and temperature played important role. Moreover, the composition of liquid phase, such as pH, the concentration of 223Ra, ionic strength, the presence of complexation ligands, etc., had to be considered. Experiments were conducted under free air conditions and at pH 8 for hydroxyapatite and pH 6 for titanium dioxide in Britton–Robinson buffer. Initial 223Ra concentration was in the range from 10−11 to 10−12 mol/L. It was found that sorption kinetics was very fast (more than 90% in the first hour) in the case of both nanomaterials, so they can be directly used for efficient radium sorption.

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