Effect of concentration on efficiency and adsorption equilibrium time of lead from aqueous solution by rice husk adsorbent

Subject Areas : environmental management

Hasan Jamali Armandi ¹ , Zaman Shamohamadi Heidari ²

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Received: 2009-06-05 Accepted : 2010-02-06 Published : 2010-04-03

Keywords: Model, Lead, Adsorption, Rice husk, Adsorption efficiency, equilibrium time,

Abstract :

Objective: This study reviews the efficiency of absorption and equilibrium time Variations in concentrations were measured. Materials and methods: For this rice husk absorbent was used to absorb lead Kinetic adsorption experiments were carried out for estimation equilibrium time in varied concentrations. The results showed that in varied concentration amount the lead adsorbed per unit weight of adsorbent increased with increase contact time and process adsorption equilibrium reached at 60, 90, 105, 120, 90, 75 and 60 minutes for initial lead concentration 1, 10, 20, 50, 100, 200 and 500 mg/l, respectively. Results: Adsorption efficiency increased with decreasing solution concentration from 500 mg/l to 1 mg/l. However obtained maximum adsorption efficiency at concentration was 1 mg/l (%98). The experimental data were fitted using Ho &et al. and Lagergren  kinetic models. Results showed that lead ions adsorption on rice husk followed adsorption model of Ho & et al. The experimental results were fitted to the Langmuir and Freundlich isotherm models. Results showed that experimental data fitted well the Freundlich model isotherm.