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

Authors : Layla ALMALIKE, Akram ALASADİ, Abdulrazzaq ABDULLAH

Pages : 702-717

Doi:10.35378/gujs.650923

View : 20 | Download : 13

Publication Date : 2020-12-01

Article Type : Research Paper

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 insert ignore into journalissuearticles values(Pb); reactivity with Cadmium insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(ΔGo);, standard entropy insert ignore into journalissuearticles values(ΔSo);, and standard enthalpy insert ignore into journalissuearticles values(ΔHo); were investigated. The interaction of adsorption is revealed to be exothermic in nature
Keywords : Heavy metals, Adsorption, Adsorption isotherm