Abstract
This paper presents the biosorption of chromium onto red seaweed (Polysiphonia nigrescens). Batch mode experiments were performed to determine experimental parameters affecting sorption process such as pH, contact time, initial metal ion concentration and biomass dosage. The Cr(III) sorption was dependent on pH and adsorbent dosage. The adsorption kinetic data could be fitted with a pseudo-second-order model and the equilibrium data with a Langmuir model. The maximum sorption capacity was of 16.11 mg/g at pH 4 and 10 g/L of biomass dosage. 0.1 M H2SO4 showed good desorption efficiency (>80%). Spectroscopy analysis showed that Cr(III) sorption on seaweed was mainly through the ion-exchange mechanism. This report indicates that P. nigrescens is an effective and economical sorbent for removal of Cr(III) from wastewaters.
Highlights
Pollution of surface and groundwater supplies with toxic heavy metal has been one of the major causes for the deterioration in water quality
This paper presents the biosorption of chromium onto red seaweed (Polysiphonia nigrescens)
The mean free energy of metal sorption process calculated from D-R parameter and the Polanyi potential was found to be in the range of 8 - 16 kJ/mol indicating that the main mechanism governing the sorption process is most likely ion exchange
Summary
Pollution of surface and groundwater supplies with toxic heavy metal has been one of the major causes for the deterioration in water quality. Biosorption is a cost effective process by using biomass raw materials which are either abundant (seaweeds) or wastes from other industrial operations (fermentation or seaweed processing wastes) for decontamination of ionic pollutants, such as heavy metal ions [7]. Different species of algae biomasses have been used for the removal of heavy metals from aqueous solution [2,4,5,6,7,8,9,10]. Prado et al [11] explained that high level of sulfation of the polysaccharides from P. nigrescens suggests that this seaweed could constitute an important biomass for removing heavy metals from aqueous environments. Tential of P. nigrescens biomass for removal of Cr(III) ions from aqueous solution. Experimental parameters affecting the sorption process such as pH, contact time, initial metal ion concentration and biomass dosage were studied.
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