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Abstract Friedel‟s salt (3CaO·Al2O3·CaCl2·10H2O), known as chloride hydrocalumite is an anion exchanger mineral belong to the family of the layered double hydroxides (LDHs) and is a stable hydration product of cement/concrete subjected to sea water or other chemical aggressive attacks, so this salt can be easily and cheaply prepared . Friedel′s salt is a (LDHs) widely used in adsorption of harmful anions and cations such as arsenate, chromium, silicate, phosphate and cadmium by its ion exchange characteristic. The aim of this work is to investigate the adsorption behavior of the Friedel’s salt in aqueous solutions toward Cu+2 and Ni+2 ions at different pHs values, and the mechanism of metal ion adsorption are also studied. The main points that could be derived from this study are summarized in the following:- 1- The stability and solubility of Friedel’s salt is affected by pH. 2- The stability of F.S. in solutions is changed according to pHs of the solutions, the higher stability at pH=6 and lower stability at pH= (4 and 8). 3- There are adsorption properties of F.S. toward cations, such as Cu+2 and Ni+2 ions in solutions and there properties depend on pHs and concentration of cations.4- Friedel’s salt adsorb all copper ions from the solution at pH = 4, when total copper concentration in solution =0.5mM/l rather than for 3mM/ and 8mM/l copper concentrations. 5- Friedel’s’ salt adsorb all Ni+2 ions from the solution in the pores on its surface at pH= (4 and 6), when total Ni+2 ions concentration in solution = 0.1mM/l. |