Role of the surface composition of the polyethersulfone–TiiP–H2T4 fibers on lead removal: from electrostatic to coordinative binding

The removal of toxic metal ions from water remains an environmental challenge. Promising processes involve formation of metal complexes with appropriate ligands and their successive separation using filtration over membranes. Water-soluble macromolecular ligands are, therefore, important to improve...

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Bibliographic Details
Published in:Journal of materials science 2019-05, Vol.54 (10), p.8023-8033
Main Authors: Ognibene, Giulia, Gangemi, Chiara M. A., Spitaleri, Luca, Gulino, Antonino, Purrello, Roberto, Cicala, Gianluca, Fragalà, Maria Elena
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Coordination compounds
Crystallography and Scattering Methods
Ligands
Materials Science
Membranes
Photoelectrons
Polyethersulfones
Polymer Sciences
Polymers
Porphyrins
Solid Mechanics
Titanium
Water chemistry
Water purification
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Summary:The removal of toxic metal ions from water remains an environmental challenge. Promising processes involve formation of metal complexes with appropriate ligands and their successive separation using filtration over membranes. Water-soluble macromolecular ligands are, therefore, important to improve this technology. In this investigation, we have shown that insertion of a Ti-acac-based precursor on non-water-soluble thermoplastic polyethersulfone membranes allows an effective immobilization of the meso-tetra( N -methyl-4-pyridyl)porphine which, in turn, can safely remove Pb 2+ ions from water. In particular, it has been demonstrated that the porphyrin readily coordinates Pb 2+ thus forming a sitting-atop metal derivative. Moreover, X-ray photoelectron spectroscopy has favored a complete characterization of surfaces of fiber membranes, thus providing evidences of Pb 2+ coordination. The efficiency of Pb 2+ removal from water has been discussed on the basis of competitive porphyrin deprotonation versus metal complex stability in water, and these data shed light on the role of porphyrin concentration on the fiber surface that can switch the metal absorption from a pure electrostatic interaction to coordinative complexation.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-019-03442-7