Mechanism of nickel extraction from sulfuric acid medium by synthesized α‐aminophosphonate derivative

Abstract

A new compound, α‐aminophosphonate derivative containing pyridine ring (PPDE), was designed and synthesized as an extractant for the separation of nickel from metal impurities. Over 94.5% of Ni (II) extraction from sulfuric acid solution was achieved by using PPDE with an equilibrium pH of 4.02. Meanwhile, high separation coefficients of 23.8 for Ni to Co, 84.9 for Ni to Mn, 254.1 for Ni to Ca and 696.7 for Ni to Mg, respectively, were obtained. It was noted that PPDE exhibited an excellent regenerability, and the extraction of Ni with the recycled organic phase ranged from 92.5% to 93.9% during six circulations. The extracted nickel complex was determined as [Ni (PPDE)2(DNNSA−)2(H2O)4], which was supported by the data obtained from Fourier transform‐infrared, UV–Vis and electrospray ionization‐mass spectrometry spectra.

Direct Extraction of Ni(II) from Acidic Polymetallic Sulfate Media with a Novel Synergistic Extraction System of DNNSA-MSL211

“…The slight redshift of SO indicates that the O atoms of −SO 3 group in deprotonated DNNSA may form hydrogen bonds with the H atoms of water molecules . The results of previous research also support this conclusion. , Moreover, the peak at 1439 cm –1 for the stretching vibration band of the pyridine ring in MSL211 was blueshifted to 1050 cm –1 in the extracted Ni­(II) complex, suggesting that the pyridine ring may coordinate with Ni­(II) via N atoms. The other characteristic vibration bands for DNNSA and MSL211 were highly consistent with the extracted Ni­(II) complex, indicating that those groups did not interact with Ni­(II) during the extraction process.…”