Effect of halides on adsorption properties of polyether laprol 2402 C on copper and tin electrodes

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 552; pp. 97 - 103
• Main Authors: Survila, Arvydas, Mockus, Zenius, Kanapeckaite, Stase
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.08.2003; Elsevier Science
• Subjects: Adsorption; Applied sciences; Chemical and electrochemical properties; Copper; Exact sciences and technology; Halides; Impedance; Metals. Metallurgy; Polyether laprol; Tin; Tin; Polyether laprol; Adsorption; Copper; Impedance; Halides; Tin Sulfates; Adsorption isotherm; Ethylene oxide copolymer; Acidic solution; Sulfuric acid; Electrodes; Copper Sulfates; Medium effect; Equivalent circuit; Propylene oxide copolymer; Electrical impedance
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/S0022-0728(03)00047-0

Voltammetry and the EIS technique are applied to study the adsorption behaviour of polyether laprol 2402 C on Cu and Sn electrodes in strong acidic sulphate solutions containing different halides. Laprol exhibits no pronounced effect on the kinetics of Cu(II) reduction in halide-free solutions. In contrast, strong inhibitive adsorption takes place in the Sn/Sn(II) system. The specific adsorption of halides taking place on copper and tin electrodes results in different effects. In the case of a copper electrode, halides may act as bridging particles enhancing laprol adsorption, whereas the competitive adsorption is responsible for a partial suppression of laprol adsorption on a tin electrode. The above effects were found to increase in the sequence: Cl −<Br −<I −. The possible adsorption isotherms are discussed.