Author(s)

Mohammed Abd-El-Aal Ahmed Ayash^1*, Tarek Ahmed Seaf Elnasr^2,3, Madiha Hassan Soliman⁴

¹Sohag Company for Water and Waste Water, Dar El Salam, Sohag, Egypt.
²Chemistry Department, Faculty of Science, Al-Azhar University, Assiut, Egypt.
³Chemistry Department, Collage of Science, Jouf University, KSA.
⁴Chemistry Department, Faculty of Science, Helwan University, Cairo, Egypt.

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.

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

Ayash, M. , Elnasr, T. and Soliman, M. (2019) Removing Iron Ions Contaminants from Groundwater Using Modified Nano-Hydroxyapatite by Nano Manganese Oxide. Journal of Water Resource and Protection, 11, 789-809. doi: 10.4236/jwarp.2019.116048.