scholarly journals A preliminary batch study of sorption kinetics of Cr(VI) ions from aqueous solutions by a magnetic ion exchange (MIEX®) resin and determination of film/pore diffusivity

2016 ◽  
Vol 164 ◽  
pp. 208-218 ◽  
Author(s):  
R. Hans ◽  
G. Senanayake ◽  
L.C.S. Dharmasiri ◽  
J.A.P. Mathes ◽  
D.J. Kim
Keyword(s):  
Ion Exchange ◽  
Aqueous Solutions ◽  
Sorption Kinetics ◽  
Batch Study ◽  
Magnetic Ion ◽  
Kinetics Of

SELECTIVE DETERMINATION OF CARBON MONOXIDE BY SINGLE METAL OXIDE SENSOR

2019 ◽  
Vol 62 (4) ◽  
pp. 76-81
Author(s):  
Kristina L. Chegereva ◽  
Alexey V. Shaposhnik ◽  
Alexey A. Zvyagin ◽  
Pavel V. Moskalev
Keyword(s):  
Carbon Monoxide ◽  
Qualitative Analysis ◽  
Chemical Interaction ◽  
Ethanol Vapor ◽  
Sorption Kinetics ◽  
Temperature Modulation ◽  
Selective Determination ◽  
Chemisorbed Oxygen ◽  
Kinetics Of

Semiconductor sensors are often used to solve an important practical problem – the determination of the concentration of carbon monoxide in the air. Their disadvantage is the low selectivity, which can lead to false alarm when other reducing gases such as ammonia or ethanol vapor appear in the air. To increase the selectivity, we used pulsed temperature modulation in combination with a special composition of the gas sensitive layer of the sensor. The use of pulse temperature modulation has revealed the features of the analyte associated with the sorption kinetics at the surface of the sensor, with the kinetics of the chemical interaction between reductant analytes and chemisorbed oxygen, and the kinetics of desorption of chemical interaction products. However, information on the qualitative composition of the medium is contained in the experimental data in an implicit form, because the qualitative analysis procedure with the use of low selectivity sensors has so far remained undeveloped. In this paper, we proposed a qualitative analysis method based on the power-law regression model that relates the concentration of analyte gas to the electrical resistance of the sensor at various times during the measurement cycle. The experimental procedure shown in our work leads to an increase in the sensitivity of the quantitative analysis by one or two orders of magnitude depending on the concentration of carbon monoxide.

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

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

Capillary-electrophoretic determination of zinc and cadmium ions in aqueous solutions with ion-exchange preconcentration

2010 ◽  
Vol 65 (1) ◽  
pp. 99-102 ◽  
Author(s):  
L. N. Moskvin ◽  
M. Ya. Kamentsev ◽  
G. L. Grigor’ev ◽  
N. M. Yakimova
Keyword(s):  
Ion Exchange ◽  
Aqueous Solutions ◽  
Cadmium Ions ◽  
Capillary Electrophoretic
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