The influence of ionic strength on the adsorption of azide ions on mercury electrodes

1986 ◽  
Vol 64 (2) ◽  
pp. 413-418 ◽  
Author(s):  
Artur J. Motheo ◽  
Ernesto R. Gonzalez ◽  
Luis A. Avaca
Keyword(s):  
Ionic Strength ◽  
Adsorption Isotherm ◽  
Double Layer ◽  
Activity Coefficients ◽  
Constant Ionic Strength ◽  
Electrostatic Model ◽  
Solution Composition ◽  
Mercury Electrodes

The adsorption of azide ions on mercury electrodes has been studied from constant ionic strength solutions of composition χ M NaN3 + (μ–χ) M NaF with μ = 0.25 and 0.5. Double layer parameters were obtained by taking into account the change in activity coefficients with solution composition. The results were analyzed together with those reported previously for μ = 0.95, recalculated to take into account the change in activity coefficients. The influence of the ionic strength on the amount adsorbed, the properties of the inner layer, and the parameters of an adsorption isotherm for azide anions are discussed in terms of the electrostatic model of the double layer.

Specific adsorption of sulfamate ions at the mercury/solution interface

1982 ◽  
Vol 60 (13) ◽  
pp. 1643-1647 ◽  
Author(s):  
Ernesto R. Gonzalez
Keyword(s):  
Ionic Strength ◽  
Activity Coefficient ◽  
Double Layer ◽  
Adsorbed Water ◽  
Water Molecules ◽  
Electrostatic Model ◽  
Solution Composition ◽  
Solution Interface ◽  
Double Layer Capacity ◽  
Mercury Electrodes

The adsorption of sulfamate ions on mercury electrodes has been studied by measuring the double layer capacity in constant ionic strength solutions of composition xM NH4SO3NH2 + (1−x)M NH4F. It was found that sulfamate ions are weakly adsorbed on mercury, the amount adsorbed being significant only for x > 0.1 at positive charges on the electrode. Because of this, the properties of the inner layer were found to be strongly dependent on the adsorbed water molecules and the structure of the diffuse layer. It was determined that the adsorption of sulfamate ions can be described by an isotherm based on the electrostatic model of the double layer. The possible effects of the activity coefficient variation with solution composition are discussed.

Adsorption of chlorate and bromate ions on mercury electrodes from constant ionic strength solutions

1988 ◽  
Vol 85 ◽  
pp. 523-527
Author(s):  
M.M. Zuleika ◽  
Palhares SILVA ◽  
Ernesto Rafael GONZALEZ ◽  
Luis Alberto AVACA ◽  
Artur de Jesus MOTHEO
Keyword(s):  
Ionic Strength ◽  
Constant Ionic Strength ◽  
Mercury Electrodes

scholarly journals Study of polyacrylic acid adsorption on the interface of hydroxyapatite – electrolyte solutions

2013 ◽  
Vol 12 (3) ◽  
pp. 270-278
Keyword(s):  
Ionic Strength ◽  
Layer Thickness ◽  
Double Layer ◽  
Polyacrylic Acid ◽  
Electrolyte Solutions ◽  
Effect Of Temperature ◽  
Solution Composition ◽  
Ph Values ◽  
Adsorbed Amount ◽  
Double Layer Thickness

The adsorption of polyacrylic acid (PAA) on hydroxyapatite (HAP) from HAP saturated solutions was studied in this work as a function of PAA concentration, temperature, pH and ionic strength. In all experiments, the adsorption was studied under conditions of negatively charged adsorbent and adsorbate, respectively. These conditions ensured that adsorption was not electrostatically favored. The solution composition was found to influence significantly the maximum of the adsorbed amount. In fact, the adsorption of PAA, was found to increase with ionic strength, due to the decrease of double layer thickness of HAP particles. The effect of temperature and ionic strength on the kinetics of adsorption are also reported. Adsorption isotherms obtained at 30oC were found to be Langmuirtype, while at higher temperatures they were of the Brunauer-Emmett-Teller (BET) type. The absorbed amount of PAA was found to decrease with temperature, while it increased with ionic strength. For pH values lower than 6.5, the adsorption increased while for pH between 6.5 and 9 the adsorbed amount remained almost constant.

Adsorption isotherm of ions on electrodes for solutions with constant ionic strength

1973 ◽  
Vol 47 (1) ◽  
pp. 127-136 ◽  
Author(s):  
B. Damaskin ◽  
U. Palm ◽  
E. Petyärv ◽  
M. Salve
Keyword(s):  
Ionic Strength ◽  
Adsorption Isotherm ◽  
Constant Ionic Strength
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