Highly enhanced selectivity for the separation of rhenium and molybdenum using amino-functionalized magnetic Cu-ferrites
2015
Li, Yanhui | Yang, Lijun | Liu, Xueyan | Li, Na | Zhang, Lei | Li, Qi | Yang, Yang | Duan, Yu | Zhang, Fuquan
An effective method based on magnetic solid-phase extraction for the selective recovery of rhenium and molybdenum has been developed using diethylamine-functionalized magnetic CuFe₂O₄ (NH₂@CuFe₂O₄) as adsorbents. Various experimental parameters that could affect the extraction efficiency had been investigated in detail. NH₂@CuFe₂O₄ exhibited high adsorption ability and selectivity to [Formula: see text] and [Formula: see text]; selective separation of [Formula: see text] and [Formula: see text] could be achieved by adjusting pH of the aqueous solution. The [Formula: see text] adsorption reaction was found to be fast, and the adsorption equilibrium was attained within 6.0 min following a pseudo-second-order model with an observed rate constant (k ₂) of 0.0215 mg·g⁻¹·min⁻¹/0.0496 mg·g⁻¹·min⁻¹ at 298 K. The adsorption data could be well interpreted by the Langmuir model. The maximum adsorption capacities for [Formula: see text] and [Formula: see text] obtained from the Langmuir model are 41.667 and 62.893 mg g⁻¹, respectively. The extraction recovery of [Formula: see text] was more than 93 % from Mo–Re simulated industrial leach liquor.
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