Nitrocellulose Membrane, Modified by RC(S)NHP(X)(OiPr)₂ (X = S, R = PhNH; X = O, R = PhNH, Ph), for Sorption Extraction of Cobalt Cations

Abstract

The complexation and extraction properties of RC(S)NHP(X)(OiPr)₂ [X = S, R = PhNH (HL^I); X = O, R = PhNH (HL^II), Ph (HL^III)] towards cobalt cations were studied. The nitrocellulose membrane was used as a carrier for HL^I−III. The maximal degree of extraction of cobalt cations from an aqueous solution is observed at pH = 7.8–8.4. It was established that complexes formed are kept in a water solution on a surface of the carrier and washed away in 96% aqueous ethanol. The membrane modified by HL^I allows extraction and concentration of Co(II) selectively, while the modification by HL^III leads to the selective extraction of Co(III).

Keywords:

• Cobalt
• complex
• membrane extraction
• thioamide
• thiourea