Removal of Ni (II) ions from Aqueous Solutions Using Origanum majorana-Capped Silver NanoParticles Synthesis Eequilibrium

The applicability of Origanum majorana-Capped Silver nanoparticles synthesis for removing Ni (II) ions from aqueous solutions has been reported. This novel material was characterized by different techniques such as FT-IR, XRD and SEM. The influence of nanoparticle dosage, pH of the sample solution, individual ions concentration, temperature, contact time between the sample and the adsorbent were studied by performing a batch adsorption technique. The maximum removal of 30 mg L-1 of individual ions from an aqueous sample solution at pH 9.0 for Ni (II) ions was achieved within 60 min when an adsorbent amount of 40 mg for Ni (II) ions was used. It was shown that the adsorption of Ni (II) ions follows the pseudo-second-order rate equation, while the Langmuir model explains equilibrium data. Isotherms had also been used to obtain the thermodynamic parameters such as free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) of adsorption. The negative value of (ΔGo, ΔHo and ΔSo) confirmed the sorption process was endothermic reflects the affinity of origanum majorana-capped silver nanoparticles synthesis for removing Ni (II) ions. A maximum adsorption capacity in binary-component system (180.0 mg/g for Ni (II) ions).