Uptake of Ni2+ and rhodamine B by nano-hydroxyapatite/alginate composite beads: batch and continuous-flow systems |
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Authors: | Akeem Adeyemi Oladipo Mustafa Gazi |
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Affiliation: | 1. Polymeric Research Materials Laboratory, Chemistry Department of Eastern Mediterranean University, TRNC via Mersin 10, Turkey;2. Chemistry Department of Eastern Mediterranean University, TRNC via Mersin 10, Turkey |
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Abstract: | Alginate encapsulated nano-hydroxyapatite beads were synthesized and characterized by Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller surface analysis, and X-ray diffraction. Their adsorptive potential for Ni2+ and rhodamine B was explored in batch mode and by fixed-bed column passage. In the batch system, maximum uptake capacity for Ni2+ was 360 mg g?1 and 480 mg g?1 for rhodamine B. In the presence of humic acid, sorption was enhanced. For the continuous-flow system, adsorption was effective at low flow rate. For both pollutants, mass transport resistance increased during adsorption. The overall rates of rhodamine B and Ni2+ uptake were found to be controlled by external mass transfer. |
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Keywords: | alginate nano-hydroxyapatite heavy metal removal basic dye composite beads humic acid |
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