Natural Science · 2012 · 23 citations · 28 references
Natural SciencesChemical EngineeringChemistryInorganic ChemistrySurface ScienceWater TreatmentAdsorption At InterfacesAdsorption ProcessesClay MineralsMineral ChemistryMineral Surface ChemistrySurface AdsorptionAdsorption CapacityAdsorption KineticsAdsorption PhenomenaAdsorption ThermodynamicsClay Mineral AdsorptionLangmuir Adsorption ModelPseudo-second-order KineticsSecond-order Kinetics
The adsorption behaviour of Cu2+ onto maghnite was conducted under batch conditions. The effect of time, pH of the dispersion, temperature and initial metal concentration on the adsorption of Cu2+ onto maghnite was investigated. In this study, 94% of Cu(II), was adsorbed on the maghnite clay when the equilibrium was reached at 120 min. The adsorption of Cu2+ was a fast process that followed the pseudo-second-order kinetics. This process could be described by the Langmuir model and gave a maximum Cu2+ adsorption capacity of 21.78 mg/g at 293 K. The thermodynamic parameters such as variation of enthalpy ΔH, variation of entropy ΔS and variation of Gibbs free energy ΔG were calculated from the slope and intercept of lnKd vs. 1/T plots. The adsorption was endothermic reaction. The adsorption process for this natural maghnite is more spontaneous because the values of ΔG are less negative. The results suggested that natural maghnite was suitable as sorbent material for the recovery and adsorption of metal ion from aqueous solutions.
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Adsorption of Pb(II), Cd(II), Ni(II) and Cu(II) onto natural kaolinite clay
Ming Jiang, Xiao-ying Jin, Xiao-Qiao Lu et al. · Desalination · 2009 · 627 citations