Sorption equilibria of lead(II) on some Palestinian soils—the natural ion exchangers

Sorption equilibria of lead(II) on two different types of soils have been studied at 30 °C and 50 °C by a batch process. The sorption data are analyzed in terms of sorption isotherm, the Langmuir equation, the distribution coefficient and various thermodynamic parameters. The adsorption data are in close agreement with the Langmuir equation at both temperatures. Sorption of lead(II) is higher in Biet Hanoun soil than in Biet Lahya soil and lower at higher temperature in both soils. The thermodynamic equilibrium constant Ko and ΔG°, ΔH° and ΔS° values have been calculated for predicting the nature of sorption.