Current Environmental Engineering

Jong Moon Park
Department of Chemical Engineering
School of Environmental Engineering
Pohang University of Science and Technology
Pohang, Kyungbuk


Adsorption of Hexavalent Chromium Ion from Aqueous Solutions on Psyllium Mucilage and Cross-Linked Psyllium Mucilage Beads

Author(s): Deepti Goyal, Anuradha Mishra.


In this paper, the adsorption of Cr(VI) by a natural polysaccharide, psyllium mucilage has been reported by conducting batch-type experiments at 37°C. Psyllium mucilage beads (PPB) were cross-linked with glutaraldehyde (GLA) to improve the chemical resistance and mechanical properties of beads. PPB and crosslinked (PPB-GLA) were characterized by FTIR (Fourier-Transform Infrared Spectroscopy) and SEM (Scanning Electron Microscopy). The adsorption rate and capacity of both adsorbents, PPB and PPB-GLA were measured. Adsorption experiments using AAS (Atomic Absorption Spectroscopy) were done at varying concentrations of hexavalent chromium (Cr(VI)), amount of PPB and PPB-GLA, time and pH. Adsorption of Cr(VI) was highly dependent on pH of the medium. One gram of PPB-GLA adsorbed 456 mg of chromium at pH 3. Cr(VI) adsorption has also been confirmed by EDAX (Energy Dispersion Analysis by X-ray) and DRUV (Diffuse reflectance UV-VIS) analysis. Equilibrium data correlated with the Langmuir model and kinetic experimental data fitted with the second-order kinetics.

Keywords: Adsorption isotherms, adsorption kinetics, chromium removal, green materials beads, psyllium.

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Article Details

Year: 2014
Page: [191 - 198]
Pages: 8
DOI: 10.2174/221271780103150522163248
Price: $58