Wyniki wyszukiwania - BazTech

1

Adsorption of 4-aminopyrimidine at the R-AgLAFE/chlorate(VII) interface. Comparison of the adsorption properties of various water activity as well as different surfactants

Martyna Marlena, Pawlak Alicja, Grochowski Mariusz, Bazan-Woźniak Aleksandra, Pietrzak Robert, Nosal-Wiercińska Agnieszka

Physicochemical Problems of Mineral Processing

|

2023

|

Vol. 59, iss. 4

art. no. 170204

EN

The results of 4-aminopyrimidine (4-APM) impact studies on the double layer parameters at the R-AgLAFE/ chlorates(VII) interface in the solutions with different water activity as well as different properties of the mixed adsorption layer of 4-aminopirimidine - sodium 1-decanesulfonate (SDS) and 4- aminopyrimidine - hexadecyltrimethylammonium bromide (CTAB) at the electrode/solution interface are discussed.The differential capacity of the double layer (Cd) at the R-AgLAFE/ basic solution interface was measured using the electrochemical impedance spectroscopy. The zero charge potential (Ez) was determined using a streaming electrode, while the surface tension at the zero charge potential (Yz) was measured using the largest pressure method inside the mercury drop. It was proved that both the 4-aminopirymidine concentration and water activity have an essential effect on the doublelayer parameters on the R-AgLAFE/ chlorates(VII) interface. In the studied systems: 4-APM - SDS and 4-APM - CTAB, 4-aminopyrimidine dominance was observed.

2

Study of 2–thiocytosine/ surfactant adsorption at the R-AgLAFe/chlorate(VII) interface – impact of surfactant ionic character

Martyna Marlena, Grochowski Mariusz, Urban Teresa, Nosal-Wiercińska Agnieszka

Physicochemical Problems of Mineral Processing

|

2022

|

Vol. 58, iss. 2

art. no. 144322

EN

Effect of 2 – thiocytosine on the parameters of double R-AgLAFe/ chlorate(VII) interface layer in the presence of different surfactants has been studied. There were determined the adsorption parameters such as: differential capacity of the double layer (Cd) at the R-AgLAFe/ basic electrolyte interface; potential of zero charge (Ez) and surface tension at the potential of zero charge (γz). The predominance of 2–thiocytosine in formation of adsorption equilibria of 2–thiocytosine–SDS and 2– thiocytosine–CTAB mixtures as well as the competitive adsorption between molecules 2–thiocytosine-surfactant or mixed micelles was proved. The changes pointing out to different arrangement of SDS or CTAB molecules on the electrode surface also in the presence of 2–thiocytosine were observed.

3

Temperature influence on the electrode process in the presence of 6-thioguanine and surfactants

Nosal-Wiercińska Agnieszka, Kaliszczak Waldemar, Martyna Marlena, Szabelska Anna, Gołębiowska Beata, Wiśniewska Małgorzata

Physicochemical Problems of Mineral Processing

|

2020

|

Vol. 56, iss. 6

14--21

EN

The measurements concerning the process of the electroreduction of Bi(III) ions in the presence of 6–thioguanine (6TG) and Triton X-100 as well as Tween 80 in the 2 mol·dm-3 chlorates(VII) demonstrate a dependence of the process rate on temperature. The applied electrochemical techniques (DC polarography, cyclic and SWV voltammetry) allowed to determine the kinetic and thermodynamic parameters as well as their correlation with changes in kinetics of the electrode process. The catalytic activity of 6TG was confirmed by the decrease of overall enthalpies of activation. Different values of ∆𝐻# and ∆𝑆° for Bi(III) electroreduction in the presence of 6–thioguanine as well as Triton X-100 and Tween 80 suggest changes in kinetics of the electrode process towards inhibition.

4

Adsorption and electrokinetic studies of sodalite/lithium/poly(acrylic acid) aqueous system

Wiśniewska Małgorzata, Franus Wojciech, Fijałkowska Gracja, Ostolska Iwona, Wójcik Grzegorz, Nosal-Wiercińska Agnieszka, Gościańska Joanna

Physicochemical Problems of Mineral Processing

|

2020

|

Vol. 56, iss. 6

158--166

EN

The synthetic zeolite-sodalite obtained by the hydrothermal conversion of fly ash with aqueous sodium hydroxide was used in the experiments. Its adsorption properties in relation to lithium ions were examined. The effects of: solution pH, presence of polymeric substance – poly(acrylic acid) and order of individual adsorbates addition were determined. To specify the binding mechanism of lithium ions on the sodalite surface, besides adsorption experiments, the measurements leading to the solid surface charge density and zeta potential determination, were performed. As a result, the structure of mixed adsorption layer composed of polymer+metal complexes was characterized. The presented study concerns two important issues: management of environmentally harmful wastes such as coal combustion products as well as searching for new sources of lithium and effective methods of its acquisition.

5

Effect of azathioprine on the parameters of double Hg/chlorate(VII) interface layer in the presence of nonionic surfactants

Kaliszczak Waldemar, Grochowski Mariusz, Nosal-Wiercińska Agnieszka, Brycht Mariola, Checinska-Majak Dorota, Gołębiowska Beata

Physicochemical Problems of Mineral Processing

|

2019

|

Vol. 55, iss. 6

1350--1356

EN

The mixed adsorption of azathioprine and Triton X-100 or Tween 80 at the mercury/ chlorates (VII) interface wasdescribed. The differential capacitance of the double layer Cd at the Hg/ basic electrolyte interface was measured using the electrochemical impedance spectroscopy. The potential of zero charge Ez wasdetermined applying streaming mercury electrode and the surface tension at the potential of zero charge γz was measured by the method of the highest pressure inside the mercury drop. The changes of determined parameters in the function of the supporting electrolyte concentration point with the participation of ClO4-ions in the adsorption process, as well as the electrostatic interactions between the dipoles of H2O and azathioprine–Triton X-100 or azathioprine–Tween 80 in the double layer are shown.