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has been cited by the following article:

• TITLE: Removing Iron Ions Contaminants from Groundwater Using Modified Nano-Hydroxyapatite by Nano Manganese Oxide

  AUTHORS: Mohammed Abd-El-Aal Ahmed Ayash, Tarek Ahmed Seaf Elnasr, Madiha Hassan Soliman

  KEYWORDS: Groundwater, Adsorption, Nano Materials, Hydroxyapatite, Manganese Oxide, Iron Ions, Kinetic, Thermodynamic

  JOURNAL NAME: Journal of Water Resource and Protection, Vol.11 No.6, June 30, 2019

  ABSTRACT: 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 the best to describe the adsorption process because the correlation coefficient is approaching one (R2 = 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 (ΔG, ΔH = −51 KJ/mol, and ΔS = −142 (KJ/mol)) for the adsorption process were also calculated and discussed.