عنوان المقالة:Uptake of divalent metal ions (Cu2+, Ni2+, and Co2+) by polysiloxane immobilized triamine-thiol and thiol-acetate ligand system
أ.د نظام محمود الأشقر | Prof. Nizam M. El-Ashgar | 12317
Publication Type
Journal
Arabic Authors
ssa M El-Nahhal, Basheer A El-Shetary, Kamal AR Salib, Nizam M El-Ashgar, Ahmed M El-Hashash
Abstract
Insoluble porous solid polysiloxanes-immobilized ligand systems bearing hybrid mixture of triamine-thiol ligand and thiol-acetate ligand as chelating functional groups of the general formula P-(CH2)3-X(Y) (Where P represents a silica like siloxane framework and X represents a mixture of triamine and thiol, -NHCH2)2NH-(CH2)2-NH2 and –SH, and Y represents a thiol-acetate -SCH2COOH functional groups) has been prepared. The immobilized triamine-thiol ligand system was prepared through the sol-gel process by hydrolytic polycondensation of Si(OEt)4 and a mixture of 3-mercaptopropyltrimethoxysilane and 3-diethylenetriaminepropyltrimethoxysilane coupling agents. The immobilized thiol-acetate ligand system was prepared by the reaction of polysiloxane immobilized thiol ligand with ethylchloroacetate. These ligand systems exhibit high potential for extraction and preconcentration of divalent metal ions (Co2+, Ni2+ and Cu2+). The results indicate that the triamine-thiol ligand seems to form 1:1 metal to ligand complexes, where there is no clear stoichiometry structure in the case of the thiol-acetate ligand.
Publication Date
8/31/2001
Publisher
Analytical Letters, Taylor & Francis Group
DOI
http://dx.
External Link
http://www.tandfonline.com/doi/abs/10.1081/AL-100106850
Keywords
Metal uptake, Triamine-thiol ligands, Thiol-acetate ligands polysiloxanes, Immobilized-polysiloxane
رجوع