The impact of acetazolamide - the ionic surfactant on the double layer parameters at the R-AgLAFe/ chlorates(VII) interface

Abstract

Adsorption of acetazolamide (ACT) and the mixed adsorption layers of acetazolamide (ACT) - sodium 1-decanesulfonate (SDS) and acetazolamide - hexadecyltrimethylammonium bromide (CTAB) formed at the R-AgLAFe/ chlorates(VII) interface is described. The systems were characterized by the measurements of differential capacity, potential of zero charge, and surface tension at this potential. The adsorption parameters determined in the studied systems indicate the SDS domination in the adsorption equilibria formation and the competitive adsorption between the ACT - SDS or mixed micelles. However, acetazolamide dominates in the formation of adsorption equilibria of the ACT - CTAB mixture.

Kinetics and Mechanism of In(III) Ions Electroreduction on Cyclically Renewable Liquid Silver Amalgam Film Electrode: Significance of the Active Complexes of In(III)—Acetazolamide

“…As shown earlier, ACT is adsorbed on the electrode [ 24 ] and can shift the equilibrium complexation of In(III) ions favorably. It should also be noted that acetazolamide has complex-forming properties, most likely due to its structure containing free electron pairs at the sulfur and nitrogen atoms ( Scheme 1 ).…”

“…It is also important to note the different character of the dependence ( Figure 7 ) above ACT concentration of 1 × 10 −4 mol·dm −3 , which may suggest changes in the electrode mechanism [ 24 ].…”

Catalysis of Indium Ion Electroreduction in the Presence of Acetazolamide in Chlorates(VII) Solutions with Varied Water Activity

“…It has been shown that adsorption does not limit the surface area of the electrode but activates it further. [25] Furthermore, the orientation of the adsorbed ACT molecules on the surface of a cyclically renewable liquid silver amalgam film electrode (R-AgLAFE), due to the change in water activity in basic electrolyte solutions, plays a significant role in the formation of active In-ACT complexes, which are the substrate in the electroreduction process. Since electron is transferred to the antibonding molecular orbital of the In(III) complex reactants, the inner sphere reorganisation can be noticeable.…”

“…[19] The competitive adsorption of acetazolamide, water and to a small extent, ClO 4 À in the double layer interface should be considered. [25] The presence of active In-ACT complexes in the electrode mechanism in the electrolyte solutions with much lower water activity is not excluded either. [10] All these phenomena probably translate into a change in the electrode mechanism in more concentrated chlorates(VII) solutions, which also involves changes in the dynamics of the catalytic activity of ACT.…”