**6. Conclusion**

High and low concentration level of Fe3+ ions can be adsorbed on different types of natural adsorbents. This process can be used to remove Fe3+ ions from aqueous solutions. The thermodynamic isotherms indicate the behavior picture of Fe3+ ions onto the surface of natural adsorbent as homogenous or heterogeneous monolayer coverage. It depends on the chemical nature of adsorbent surfaces. Mostly, the thermodynamic parameters show the spontaneous and exothermic adsorption processes of Fe3+ ions onto the surfaces of natural adsorbents, indicating of easier handling.

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