Interaction of Polyacrylic Acid with Copper, Cobalt, and Nickel Ions in Aqueous Solutions

Electrochemistry of Copper in Polyacrylic Acid: The Electrode Mechanism and Analytical Application for Gaseous Hydrogen Peroxide Detection

“…The supporting electrolyte consisting of 1% (mass percent) PAA and potassium nitrate has a pH close to 3, which indicates that only a fraction of carboxylic groups of PAA is dissociated. Literature data indicate that Cu 2+ ions are mainly in a hydrated form and less than 10% of dissolved Cu 2+ ions are in a form of carboxylic complexes . Thus, a typical voltammogram of Cu 2+ ions in the studied supporting electrolyte at a glassy carbon electrode consists of a pair of voltammetric peaks, in accord with the electrode mechanism described with eqs – (Figure ).…”

“…Literature data indicate that Cu 2+ ions are mainly in a hydrated form and less than 10% of dissolved Cu 2+ ions are in a form of carboxylic complexes. 37 Thus, a typical voltammogram of Cu 2+ ions in the studied supporting electrolyte at a glassy carbon electrode consists of a pair of voltammetric peaks, in accord with the electrode mechanism described with eqs 1−3 (Figure 1). The broad, single cathodic peak reflects the electrode reductions of both Cu 2+ and Cu + ions, affected by the chemical reaction 2, whereas the anodic peak represents the anodic stripping of the metallic copper deposited on the GC electrode surface.…”

Estudo de sistemas para a remoção de cátions usando materiais poliméricos solúveis sintetizados via polimerização radicalar

“…É importante ressaltar que, nesse processo, os mecanismos de adsorção acontecem até que as concentrações de dentro e fora da membrana se igualem e o processo entre em equilíbrio químico, porque a passagem de cátions pelos poros da membrana não cessa até que todos os sítios livres do polímero captem a máxima quantidade de cátion metálico possível do meio aquoso. Além disso, uma vantagem a ser estudada seria que a taxa de captação de cátions por grama de polímero adsorvente presente pode ser potencializada pelo fato de os polímeros ligantes estarem totalmente solúveis no meio reacional, tendo, portanto, todos os seus sítios disponíveis para a ligação (CHEVTAEV et al, 2020;TOMIDA et al, 2001).…”