Élaboration et application des biocomposites à base de biopolymère anionique

Abstract

This work focuses on the synthesis of a biocomposite based on sodium alginate with recycled and treated glass powder, as well as the evaluation of its efficiency towards Cu2+ ions from aqueous solutions. Waste glass powder was firstly treated with NaOH/EDTA in order to improve its surface properties. The optimal treatment conditions were determined using the (RSM) based on the (CCD), by investigating the effects of several parameters on mass loss, complexation capacity and sedimentation volume. The optimized conditions were found to be a NaOH concentration of 4.80 mol·L−1, a treatment time of 2 h 55 min, a temperature of 80 °C and an EDTA/inorganic charge ratio of 2.17% (w/w). The biocomposite was then prepared through ionic crosslinking of sodium alginate with calcium chloride (CaCl2). FTIR spectroscopy confirmed both the chemical modification of the glass powder and its successful incorporation into the polymer matrix. The adsorption performance of the biocomposite was evaluated using UV-Visible spectrophotometry. The results demonstrated a high removal efficiency for Cu2+ ions, reaching 95.09%. The kinetic and adsorption isotherm studies confirmed the effectiveness of the developed biocomposite, with the experimental data showing a better fit to the pseudo-second-order (PSO) kinetic model and the Freundlich isotherm model.