Abstract
This study describes the sorption of Cr(VI) by MgAl-NO3 hydrotalcite in a fixed-bed column. The sorbent was prepared via coprecipitation method and characterized by XRD, FTIR, BET surface area and pH zpc . The effects of operating parameters such as bed height, flow rate and inlet concentration were investigated in continuous mode. As a result, the exhaustion time increased with the increase of bed height, decrease of flow rate and inlet concentration. A mathematical model based on the constant pattern theory and the Freundlich isotherm was applied to predict the experimental data, and to evaluate the model parameters of the fixed-bed column. The developed model describes well the breakthrough curves at various operating conditions. The calculated volumetric mass transfer coefficient K L a depends directly on these conditions. K L a increased with increasing flow rate and inlet concentration, while remained almost constant with varying bed height.
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Khitous, M., Salem, Z. & Halliche, D. Sorption of Cr(VI) by MgAl-NO3 hydrotalcite in fixed-bed column: Experiments and prediction of breakthrough curves. Korean J. Chem. Eng. 33, 638–648 (2016). https://doi.org/10.1007/s11814-015-0170-3
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DOI: https://doi.org/10.1007/s11814-015-0170-3