Issue 19, 2015

Acid-vacuo heat treated low cost banana stems fiber for efficient biosorption of Hg(ii)

Abstract

The potential of banana stem fiber (BSF) as a low cost biosorbent for Hg(II) removal was studied. HCl treatment increased the cellulose accessibility which led to an enhanced interaction of Hg(II) and BSF. Activation of BSF-HCl in vacuo at 373 K increased the maximum biosorption capacity from 28 to 372 mg gāˆ’1 and altered the activation energy from 3.5 to 76.9 kJ molāˆ’1 showing an increase in Hg(II) chemisorption. FTIR and ESR results confirmed the large amount of structural defects on the activated BSF-HCl which led to the increase in Hg(II) uptake. Batch biosorption models showed that the kinetics follow pseudo-second-order and the equilibrium uptake fitted to all three-parameter models showing the Hg(II) biosorption behaves as a Langmuir isotherm. The non-linear regression method exhibited higher coefficient of determination values for isotherm and kinetic analyses compared to the linear method. The thermodynamic functions indicated that the nature of Hg(II) biosorption is an exothermic and non-spontaneous process.

Graphical abstract: Acid-vacuo heat treated low cost banana stems fiber for efficient biosorption of Hg(ii)

Supplementary files

Article information

Article type
Paper
Submitted
11 Nov 2014
Accepted
16 Jan 2015
First published
22 Jan 2015

RSC Adv., 2015,5, 14129-14137

Author version available

Acid-vacuo heat treated low cost banana stems fiber for efficient biosorption of Hg(II)

N. Salamun, S. Triwahyono, A. A. Jalil, T. Matsuura and N. F. M. Salleh, RSC Adv., 2015, 5, 14129 DOI: 10.1039/C4RA14320E

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