Abstract
Extraction, preconcentration and separation of somemetal ions by 2(propylamino)benzenethiol polysiloxane immobilized ligand system
Author(s): Nizam M. El-AshgarPorous solid polysiloxane functionalized by 2-(propylamino)benzenethiol ligand of the general formula P-(CH2)3-NH(C6H4)SH, (Where P represents [Si-O]n siloxane network) has been prepared by reaction of the immobilized 3-iodopropylpolysiloxane, P-(CH2)3-I with an excess of 2- aminothiophenol. The ligand system was evaluated for extraction and preconcentartion ofCo(II),Cu(II) andNi(II)metal ions fromaqueous solutions. Themaximumretention capacity followed the sequence;Cu(II)>Ni(II) > Co(II). The ligand system was also applied as a stationary phase in a glass column and showed a clean separation of Co(II), Ni(II) and Cu(II) metal ions aqueous solution mixture. The optimum separation pH values were 5 and 4 for Co(II) and Ni(II) cations respectively, while a solution of 0.1MHNO3 was used to elute Cu(II) cation.
