Abstract
The adsorption characteristics of Cephalosporins antibiotics from aqueous solution were investigated using magnesium oxide (MgO) nanoparticles. Liquid phase adsorption experiments were conducted. Batch adsorption studies are carried out by observing the effect of experimental parameters, namely amount of adsorbents, pH, temperature and contact time. The drug removal data were fitted on Langmuir adsorption equations. The pseudo second-order kinetic model was indicated with the activation energy of 7.6682 and 5.3745kJ/mol for Cephalexin and Cefixime, respectively. The values of the enthalpy (ΔH#) and entropy of activation (ΔS#) were 5.0851kJ/mol and −286.67J/molK for Cephalexin; 3.1952kJ/mol and −303.70J/molK for Cefixime, respectively. The free energy of activation (ΔG#) at 30°C was 97.9kJ/mol. Thermodynamic analysis showed negative values of ΔG° indicating adsorption was favourable and spontaneous, negative values of ΔH° indicating exothermic physical adsorption of Cephalosporins using MgO nanoparticles.
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