Extraction and Separation of Nickel(h) Using Bis (2,4,4-Trimethylpentyl) Dithiophosphinic Acid (Cyanex 301) and Its Recovery From Spent Catalyst and Electroplating Bath Residue

Performance Evaluation of Nickel Separation and Extraction Process from Simulated Spent Cr/Ni Electroplating Bath Solutions by ELM Process Using LIX63 and PC88A

“…After that operation, polyelectrolyte solid wastes are stored with landfilling. The average composition of the precipitated sludge is 21% Cr, 10% Ni, 4.2% Cu, 0.83% Fe, 0.52% Pb, 0.98% Zn, 0.24% Al, and 0.13% Mn, dried at 110 C. [10,[13][14][15][16] The toxic, semiprecious and the precious heavy metal contents of the electroplating waste solutions should be recycled or removed from the spent electroplating waste solutions before them converting to electroplating sludge due to high metal prices and storage difficulties. [17][18][19] The process for removing of heavy metals from aqueous solutions have been treated traditionally by a combination of physicochemical separation processes such as flocculation-precipitation and [20] filtration [21] and biological processes such as activated sludge and biofilm.…”

Synthesis, spectroscopic characterization and X-ray single crystal structures of trans-bis[4-methoxyphenyl (3-methylbutyl) dithiophosphinato] nickel(II) and bis [4-methoxyphenyl (3-methylbutyl) dithiophosphinato]cobalt(II) complexes

“…The characteristic asymmetric and symmetric m P=S bands are observed at 596-619 and 518-546, respectively. Characteristic m N-H bands are observed at 3,171 and 3,111 cm -1 for NH 4 L; these bands are absent in the spectra of the two complexes, confirming the exclusion of the NH 4 ? ion.…”

“…The signal at 3.7 ppm reflects the presence of the OCH 3 group, while the signals at 6.88 and 7.85 ppm, both of which are doublets of doublets, belong to the phenolic protons. The signal of the NH 4 ? protons appears to be been overlapped with the H 2 O signals, as expected.…”

“…Data were corrected for Lorenz and polarization effects, and an absorption correction was made using psi.scan after obtaining the complete structural model. The intensity data were collected by x -2h scan mode within 4 2 ]. The structures were solved by direct methods using SHELXS 97 and refined by full-matrix least squares SHELXL 97 [9].…”

“…An example of such dithiophosphinates, known as CYA-NEX 301, has found use in industry for metal extraction [4][5][6]. Some of these complexes have antitumor activity and are therefore the subject of chemotherapy studies [7].…”