In this article, we study modified nano-hydroxyapatite (HAp) by nano manganese oxide (Mn3O4) as adsorbent material to remove iron ions from groundwater. Different parameters were studied to option optimum conditions of removing such as contact time, pH, initial concentration, a dosage of adsorbent, agitation speed and temperature. Kinetics studies included first order (R2= 0.915), pseudo-first order (R2 = 0.936), second order (R2 = 0.948), pseudo-second order, (R2 = 0.995), Elovich equation model (R2 = 0.977), intraparticle diffusion (R2 = 0.946), Natarajan and Khalaf (R2 = 0.915) were carried out the obtained results revealed that the pseudo-second order is best to describe the adsorption process. Adsorption isotherm was calculation using Freundlich, Langmuir and Temkin constants, adsorption capacity from Langmuir model was 0.606 mg/g. Thermodynamic parameters (ï„G, ï„H, and ï„S) for the adsorption process were also calculated and discussed.
Keywords: Groundwater, Adsorption, nano materials, hydroxyapatite, manganese oxide, Iron ions, kinetic, thermodynamic
