Adsorption studies of lead on lateritic minerals from aqueous media

Lead removal from aqueous solution by natural and pretreated clinoptilolite: Adsorption equilibrium and kinetics

“…Ahmad et al [44] also calculated that the adsorption mean free energy from Dubinin-Radushkevich isotherm for uptake of lead on lateritic minerals was 13.96 ± 0.74 kJ/mol. Kurtoglu and Atun [45] have concluded that Pb(II) ions are removed by ion-exchange mechanism from the solutions below 5 × 10 −4 M (103.6 mg/L) while formation of surface complexes between Pb(II) species and surface hydroxyl groups increases Pb adsorption at higher concentrations.…”

Synthesis, characterization, and sorption properties of silica gel-immobilized Schiff base derivative

“…These values are listed in Table 2. The values of Freundlich constants K F and n give a measure of the sorption intensity and capacity of the sorbent, respectively [27]. The fractional value of 1/n (0 < 1/n < 1) signifies that the surface of the immobilized silica is heterogeneous is nature [27,28].…”

Insight into adsorption equilibrium, kinetics and thermodynamics of lead onto alluvial soil

“…A number of researchers have utilized wide variety of adsorbents to remove heavy metal ions from aqueous solutions. Some of the recent developments include adsorbents like, wood ash (Malakootian et al 2008), rice husk (Akhtar et al 2010), clay (Papini et al 2002), slag (Dimitrova and Mehandgiev 1998), peat (Blais et al 2002), goethite (Abdel-Samad and Watson 1998), gibbsite (Weerasooriya et al 2001)), red mud (Gupta et al 2001), lateritic minerals (Ahmad et al 2002), and calcareous soil (Das and Mondal 2011) for the removal of lead ions from aqueous solution.…”