In this article, we study modified nano-hydroxyapatite (HAp) by nano manganese oxide (Mn 3 O 4 ) 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 ( R 2 = 0.915), pseudo-first order ( R 2 = 0.936), second order ( R 2 = 0.948), pseudo-second order ( R 2 = 0.995), Elovich equation model ( R 2 = 0.977), intraparticle diffusion ( R 2 = 0.946), Natarajan and Khalaf ( R 2 = 0.915) were carried out, the obtained results revealed that the pseudo-second order is the best to describe the adsorption process because the correlation coefficient is approaching one ( R 2 = 0.995). Adsorption isotherm was calculated by using Freundlich, Langmuir and Temkin constants, adsorption capacity from Langmuir model was 0.606 mg/g. Thermodynamic parameters (Δ G , Δ H = −51 KJ/mol, and Δ S = −142 (KJ/mol)) for the adsorption process were also calculated and discussed.
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