Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 158, Issue -, Pages 71-79Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2015.11.037
Keywords
Mo(VI); Molybdenum extraction; Sulfate media; Oximes extractant; Pyridineketoxime; Quaternary pyridinium salts
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Funding
- Polish Ministry of Science and Higher Education for the Faculty of Chemistry of Wroclaw University of Technology
- Polish Ministry of Science and Higher Education for the Poznan University of Technology, Institute of Chemical Technology and Engineering Technology [03/32/DS-PB/0500]
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Hydrophobic complexing agents: 1-(3-pyridyl)undecan-1-one oxime and its quaternary salts (3-[1-(hy droxyimine)undecyl]-1-propylpyridinium bromide and 3-[1-(hydroxyimine)undecyl]-1-propylpyridinium chloride) were investigated as extractants of molybdenum(VI) ions from sulfate media. The extraction of Mo(VI) was studied as a function of several variables: equilibrium pH, acid, extractant and modifier concentrations, as well as phase ratio and contact time. The extraction of Mo(VI) was found near-quantitative for all studied compounds especially from solutions of pH 2.5, but 3-[1-(hydroxyimine) undecyl]-1-propylpyridinium chloride appeared to be the most efficient extractant of Mo(VI) from sulfate media. This salt was the most suitable extractant in terms of loading capacity and a fast stripping process with sodium nitrate and sodium or ammonium sulfate solutions. 1-(3-Pyridyl)undecan-l-one oxime was a slightly weaker extractant towards molybdenum(VI) ions, but in comparison to its quaternary salts this reagent formed more stable complexes and the re-extraction proceeded in 50%. (C) 2015 Elsevier B.V. All rights reserved.
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