ADSORTION ISOTERMAS OF ION Cu (II) IN HIGH DISORDER RETICULAR SILICATES

Abstract

Introduction:
Amorphous silicates are used as heavy metal adsorbents in aqueous solution.
Objective:
To determine adsorption isotherms in a heterogeneous system constituted for a Cu (II) ions aqueous solution and magnesium, calcium, aluminum and zinc amorphous silicates.
Materials and methods:
The mechanism that governs Cu (II) ions adsorption process from aqueous solutions in static regime over various silicon-based products with zeolitic behavior water in its structure, obtained by a gelation process, is exposed. The ion adsorption process is carried out under certain conditions of acidity, temperature, Cu2 + ions concentration, particle diameter and interaction time. The solutions have a pH of 5.06 units. Stirring velocity was 300 rpm on an AGU-10 Bunsen mechanical stirrer at 25^oC. A solution amount of 40 mL is mixed for 30 minutes with 0.2 g of corresponding metal silicate with the proposed stirring at 25 oC; it is then filtered, and the final concentration is determined by Atomic Absorption Spectroscopy.
Results and Discussion:
Langmuir's model for the adsorption isotherm has the best adjust for Cu (II) ions adsorption in aqueous solution.
Conclusions:
Calcium, zinc, magnesium and aluminum silicates are light materials and have moderate specific surface. They have Cu (II) ions moderate adsorption capacities in aqueous solution.