Abstract
The alkyl salicylaldoxime has attracted more and more attention recently due to the complex branched alkyl groups. In this study, a novel alkyl salicylaldoxime, tert-octylsalicylaldoxime, was successfully synthesized by the one-pot method. The yield and purity by the elemental analysis were 96.17 and 94.13%, respectively. The structure was confirmed by elemental analysis, FT-IR, 1H NMR (Nuclear Magnetic Resonance), 13C NMR spectroscopy, and MS. Results showed that tert-octylsalicylaldoxime with a new structure exhibited excellent extraction ability and selectivity for Cu(II) and can be successfully used to recover Cu from copper-nickel alloy electroplating wastewater. Thus, this product has the potential to be used as a powerful copper extractant in the future.
Highlights
Because copper is one of the most important base metals, the big economic development year by year will cause a serious copper supply and demand contradiction (Yu et al, 2020)
The extraction behavior of tert-octylsalicylaldoxime (TOSO) for Cu has been investigated by extraction and stripping tests
The structure of the synthesized TOSO was verified by elemental analysis, Fourier Transform Infrared Spectrum (FT-IR), 1H NMR, and 13C NMR spectroscopy
Summary
Because copper is one of the most important base metals, the big economic development year by year will cause a serious copper supply and demand contradiction (Yu et al, 2020). In nearly one hundred years of hydrometallurgy history, the importance of chemical factors in achieving the targeted performance of extraction has been widely recognized. Jiang et al have investigated the performance of DZ988N (a mixture of equal volumes of 5-nonylsalicylaldoxime and 2-hydroxy-5-nonyl-acetophenone oxime) in separating copper from sulfate solution containing Cu2+, Fe3+, and Zn2+ (Jiang et al, 2018). 5-Nonylsalicylaldoxime (NSO) (Zhang et al, 2010), a kind of AS extractant, has been most widely used to extract Cu(II) as the main effective component in the common commercial extractants (see Table 1). Minor changes to the chemical structure of the extracting molecule can have a very significant effect on the extracting agent’s performance in the extraction process
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