Optimal Conditions for Electrodeposition of Copper (II) in Presence of Alizarin Red’s by Physicochemical Methods

Abstract

The comprehensive physical properties of the aqueous  solutions of (alizarin red S - copper(II) chloride) were studied in this research with fixing the conditions (pH – concentration – temperature), then the optimal conditions for the formation of the complex Copper(II) – Alizarin Red S (ARS – Cu II) were appointed by several ways: (the pH measurement method - electrical conductivity measurement method – UV/Vis spectral method), and then the stoichiometry of the reaction of the complex formation was determined by three reference methods. It found that the complex formed when each concentrations greater than a certain limit (10^-5 M). In addition, the complex could formed at higher concentrations by adjusting the (pH) at a suitable value (4.2 → 5.8). Finally, the complex remains stable with the time keeping at suitable conditions (a way from the sun light and a way from a high temperature). Also, the electrodeposition of copper(II) was studied to determine the appropriate operating conditions and the thicknesses of the coating layer. It was obtained a good properties (brightness - surface covering: distribution of atoms - thickness ....... etc.). of deposit without using of any other additives by applying the conditions (pH = 5, i = 2 mA/cm², t = 5 min, C = 0.1 M  d = 1.756×10^-5 cm).

Keywords: Alizarin red S - (ARS – Cu II) complex - electrodeposition of Cu (II).