Abstract
ABSTRACT For the first time, χ-Al2O3 was investigated as a sorbent for the simultaneous separation of copper and molybdenum from rhenium. This work finds the optimal conditions of the process. In an acetate buffer solution with a pH of 5.5 under the action of ultrasound for 30 min, the Langmuir adsorption capacity for copper and molybdenum on this sorbent was 46 mg⋅g−1 and 44 mg⋅g−1, respectively, rhenium remained in the solution. The adsorption corresponded to the pseudo-second-order kinetics model. It has been shown that under the indicated conditions, over 80% of molybdenum and 95% of copper can be removed from synthetic solutions containing 100- and 1000-fold mass excess of copper and molybdenum. In nitric acid or sulfuric acid solutions, the same results can be achieved at a pH of 2.5–3.0. It was found that the recovery of rhenium by inductively coupled plasma atomic emission spectrometry after matrix separation was improved; on average, a threefold reduction in the relative standard deviation (n = 5) was achieved. The mechanism of adsorption of Cu, Re, and Mo ions on the surface of χ-Al2O3 was proposed, based on the interaction of ions with an electric double layer of sorbent particles.
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