Metal

Adsorption

Metal ions in aqueous solution

Inorganic chemistry

Physical chemistry

Organic chemistry

Chemistry

Journal of Electroanalytical Chemistry

The differential capacitance curves were measured with an ac bridge in the M/[N-MF + 0.1m M KCl + 0.1(1 − m) M KClO4], M/[N-MF + 0.1m M KBr + 0.1(1 − m) M KClO4], and M/[N-MF + 0.1m MKI + 0.1(1 − m) M KClO4] systems (where M = In–Ga, Tl–Ga) at the following values of molar fraction m of the surface–active anion: 0, 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, and 1. The I−, Br− and Cl− (Hal−) anions specific adsorption in the above systems can be described quantitatively by the Frumkin isotherm. The main parameters of adsorption of the I−, Br−, and Cl− anions were determined for the studied interfaces. Unlike Ga/N-MF interface, where the adsorption energy (ΔGads) increased in the sequence Br− ≈ I− null ΔGM-Br->ΔGM-I-. The values of difference (ΔGM-Hal1--ΔGM-Hal2-) are higher for the Ga electrode and lower for the (In–Ga) and (Tl–Ga) electrodes than the values of difference between the Hal− solvation energies (ΔGS-Hal1--ΔGS-Hal2-), which determines the sequences of Hal− adsorption.

Effect of metal nature on specific adsorption of Cl−, Br−, and I− ions from N-methylformamide solutions