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Equilibrium Sorption Isotherm And Kinetics For Lead (II) Onto Activated Carbon Development From Doum-Palm Seed

Ola Abdelwahab, Nevine K.Amin

Three new sorbents for removing of lead (II) ion from aqueous solutions have been investigated. The new sorbents are the crushed doumpalm seed coat (RD) and two activated carbons developed from RD by physical activation at 300°C (DAC1) and by chemical activation with H3PO4 followed by carbonization at 300°C (DAC2). The effect of the adsorption capacity of the three adsorbents was studied using different pH (1 to 9), initial lead (II) concentration (10 to 60 mg l–1), dose of adsorbent (1 to 10 g l–1) and contact time (5 to 180 min). The maximum removal of lead (II) was obtained at pH 5.0 (97%) using DAC2 adsorbent. The isotherm equilibrium data were fitted well by Freundlich adsorption isotherm to obtain the characteristic parameters of the model. The adsorption of lead ions follows the pseudo-second order rate kinetic equation. Adsorption capacity of lead (II) was 18.9 mg per gram of adsorbent at pH 5.