Adsorption of Lead and Cadmium Ions onto Soils: Isotherm Models, and Thermodynamic Studies

Abstract

The source of pollution of both underground-water and water is the existence of heavy metals in such an environment. constitutes. This research sheds light on the lead (Pb) reactivity with Cadmium (Cd) throughout their transferal in the different soils. The batch technique was used in order to demonstrate the influence of temperature, initiate concentration, adsorption-isotherm. The consequences reveal that the Freundlich model, Langmuir model, Harkin-Jura model, and Halsey model are able to adequately describe the adsorption-isotherm parameter. The adsorption ability of the heavy metals decreased once temperatures increased. On the bases of the highest ability of adsorption (Qm), the order of affinity of Lead and Cadmium for the investigated soil occurred at Pb > Cd, and the maximum capacities of adsorption of competition of two cations are decreased for the same effective sites. The change in the thermodynamic state functions such as standard free-energy (ΔGo), standard entropy (ΔSo), and standard enthalpy (ΔHo) were investigated. The interaction of adsorption is revealed to be exothermic in nature

Keywords

• Heavy metals
• Adsorption
• Adsorption isotherm

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