Abstract
A commercially available chelating polymer, polystyrene tris(2-aminoethyl)amine, was used for the removal of chromium from aqueous solution. The influence of pH, contact time, adsorbent dosage and initial Cr (VI) concentration on adsorption was studied. The optimum pH for the removal of Cr (VI) was at pH 5, while optimum contact time and adsorbent dosage were 120 minutes and 10 g/L, respectively. Total chromium and Cr (VI) concentrations were analyzed by ICP-MS and UV-Visible. Adsorption isotherms using Langmuir and Freundlich isotherm models revealed that the data fitted Langmuir isotherm model better than Freundlich with a maximum adsorption capacity of 312.27 mg/g. FTIR spectroscopy, Scanning electron microscopy (SEM) and Energy Dispersive Spectrometry (EDS) analyses were performed on the adsorbent before and after binding Cr (VI). All analyses confirmed the complexation of Cr (VI) to the adsorbent. Desorption experiments using KCl solution indicated 89.3% release of chromium, rendering this method of high potential for adsorbent regeneration.
Highlights
Chromium exists in the environment in two main oxidation states Cr (III) and Cr (VI) [1]
Inspection of these figures reveals that the percent removal of Cr (VI) and of total Cr increased with increasing adsorbent dosage and attained a constant value after a dosage of 10 g/L
The optimum dosage for the removal of Cr (VI) by polystyrene tris(2-aminoethyl)amine was set at 10.0 g/L. 3.2
Summary
Chromium exists in the environment in two main oxidation states Cr (III) and Cr (VI) [1]. (2015) Hexavalent Chromium Removal and Reduction to Cr (III) by Polystyrene Tris(2-aminoethyl)amine. A number of treatment methods for the removal of metal ions from aqueous solutions have been reported. These include reduction, ion exchange, electro dialysis, electrochemical precipitation, evaporation, solvent extraction, reverse osmosis, chemical precipitation and adsorption. Adsorption processes utilizing natural low cost adsorbents were employed in order to remove chromium from aqueous solutions. Some of these processes were able to reduce Cr (VI) to Cr (III) [1] [10]-[13]. The maximum adsorption capacity is evaluated using Langmuir adsorption isotherm and compared with reported values
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