Study of Variations Equilibrium Time at Different Concentrations by Activated Carbon Adsorbent

Subject Areas : environmental management

Hassan Jamali Armandi ¹ (MSc. Student, Irrigation and Drainage, Zabol University)
Shayan Shamohammadi ² (Associate Professor, Water engineering, Shahre Kurd University)

Received: 2009-06-05 Accepted : 2010-02-06 Published : 2014-02-20

Keywords: Adsorption, Isotherm, Kinetic, Lead, Activated Carbon,

Abstract :

Objective: The purpose of this research is the effect of initial concentration of lead absorbed on theequilibrium time by active carbon.Materials and methods: The study of granular activated carbon (GAC) of the raw material is wood w.For experimental, Absorption kinetics of initial concentration 1 to 500 mg L-1 was used and measuringthe remaining concentration absorbed by atomic absorption (Model 220 AA company varianAustralia) was performed.Results: Process adsorption equilibrium reached at 45, 60, 75, 90, 75, 70 and 60 min for initial leadconcentration of 1, 10, 20, 50, 100, 200 and 500 mg L-1. Study equilibrium time at variedconcentrations showed that decreased equilibrium time with decreasing initial lead concentration from50 to 1 mg L-1. Efficiency adsorption increased while the initial lead concentration decreased from 500to 1 mg L-1. The maximum percent adsorption of lead was found to be %99.7 at initial leadconcentration of 1 mg L-1. The experimental data were fitted using two adsorption kinetic models, theHo et al. (1996) and Lagergren (1893) models. Results showed that lead ions adsorption followedadsorption model of Ho et al. (1996). Also, fitting Langmuir and Freunlich adsorption isothermmodels on experimental data showed that Freundlich model described experimental data in a betterway.

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