Biosorption capacity of vegetable waste biomass for adsorption of lead and chromium

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Research Paper 01/08/2014
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Biosorption capacity of vegetable waste biomass for adsorption of lead and chromium

Rohama Gill, Qurat-ul-AinNadeem, RaziyaNadeem, RabiaNazir, Sadaf Nawaz
J. Bio. Env. Sci.5( 2), 306-317, August 2014.
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Abstract

Adsorption potential of prepared low cost vegetable waste mixture was studied for the removal of Pb (II) and Cr (VI) from their respective aqueous solutions. The optimized biosorbent dose for Pb (II) was 2.5 g and for Cr (VI) was 3.0 g with initial concentration of 50 ppm for both metal ions at temperatures 26°C and 35°C, respectively. The system attained equilibrium when contact time for Pb (II) was 50 minutes and for Cr (VI) it was 30 minutes. Maximum uptake capacity of biomass for Pb (II) (0.465 mg/g) and Cr (VI) (1.089 mg/g) was observed at pH 5 and 2, respectively. FT-IR and ICP studies of neat and metal loaded biomass also revealed the presence of Pb (II) and Cr (VI) onto the biomass. The sorption isotherms followed the Langmuir model for both the metals suggesting a monolayer sorption character with second-order kinetics. The results also demonstrated that for both metals the uptake capacity of prepared biomass used are comparatively higher than most of the work reported earlier.

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