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Investigation of the activity of sawdust as biosorbent towards Cr (VI) removal from waste water: Kinetic and thermodynamic studies

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Author Affiliations

  • 1 NCE in Physical Chemistry University of Peshawar, Peshawar 25120, KPK, PAKISTAN

Int. Res. J. Environment Sci., Volume 3, Issue (4), Pages 5-12, April,22 (2014)

Abstract

Cr (VI) removal from aqueous solutions by Ziziphus mauritiana (Indian jujube) sawdust biosorbent (ZMSDB) was studied in a batch mode technique. The effect of pH (2-7), contact time (10-360 minutes), temperature (293-313 K) and biosorbent dosage (0.2-1.0 g) was investigated for Cr (VI) uptake. Maximum removal of Cr (VI) was found at pH 2.0 and 3.0. Equilibrium was established in 360 minutes. The adsorption rate was best described by pseudo-second order equation. Langmuir adsorption isotherm determines the adsorption equilibrium and the monolayer adsorption capacity of Cr (VI) was found to be 3.66 mg g-1 at 313 K. The values of separation factor, R, was in flanked by 0.019 -0.0557 which pointed out constructive exclusion of Chromium (VI) over ZMSDB. Thermodynamic parameters (H, G and S) values exposed the endothermic biosorption of Cr (VI) on ZMSDB, no-spontaneity and low entropy in nature.

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