Synthesis and physicochemical characterization of new calcined layered double hydroxide Mg Zn Co Al-CO3; classical modeling and statistical physics of nitrate adsorption

This research focuses on the study of a new material, layered double hydroxide, which was synthesized using co-precipitation method at pH constant and, then, tested for its retention nitrate anions. The LDH prepared from four metal cations Mg-Zn-Co-Al to produce quadratic material mentioned, Mg Zn Co Al-CO3, calcined obtain oxides. Different techniques characterization were considered, namely FTIR, X-ray diffraction, BET, SEM and EDX. Adsorption experiments carried out test effect contact time, adsorbent mass, values, mass effect, initial surfactant concentrations. When equilibrium reached after 300 min (R2 = 0.998), Pseudo-second order model found fit accurately kinetic data. intraparticle diffusion recorded rate between 0.277 0.757 (g/mg. min−0.5) Sips adsorption isotherm best fitted experimental data obtained. Maximum capacity be 55.97 mg g−1 in accordance with results. Thermodynamic parameters indicated that process spontaneous endothermic. values ΔH˚ ΔS˚ 14.81 59.04 kJ mol−1, respectively. low value (<40 mol−1) associated physical forces. Finally, deeper insight into mechanism, statistical physics considered quantify number adsorbed molecules per site, anchorage number, receptor sites density, quantity saturation, concentration half saturation molar energy. A model, two binding sites, proved option characterize interpret removal LDH.