B3 Unrefereed conference proceedings

Metal Specific Functionalized Nanofibers


Publication Details
Authors: Laatikainen Katri, Pereao Omoniyi, Bode-Aluko Chris, Ndayamabaje Guillaume, Leslie Petrik
Publication year: 2019
Language: English
Title of parent publication: Proceedings, 2019, Priochem XV 2019 15th International Symposium “Priorities of Chemistry for a Sustainable Development” PRIOCHEM
JUFO-Level of this publication: 0
Permanent website address: https://www.mdpi.com/2504-3900/29/1/1
Open Access: Not an Open Access publication

Abstract


Functionalized nanofibers made by
electrospinning technique are one respectable option for metal removal and
purification from aqueous solutions. Because of the simple and versatile
process by resulted highly porous and high specific surface area structure with
high selectivity properties, functionalized nanofibers has been increased
interest during last decades [1]. In the case when high selectivity is needed,
chelating ligand functionalized nanofibers are good option for the removal of
heavy metals and rare earth elements (REE) from aqueous solutions [2-3]. Chelating
ligands act as donors of electrons and form coordinative bonds to a metal
cation called as the central atom, and this way can increased significantly
selectivity.


In our study, we have synthesize
polyacrylonitrile (PAN) nanofibers with 2-(2’-pyridyl)imidazole (pim) and 2-pyridine
amidoxime (PyAMi) ligands for nickel and lead removal, respectively. Furthermore,
we have also synthesize polystyrene (PS) and polyethylene terephthalate (PET)
nanofibers with diglycolic anhydride ligand (DGA) and studied it for removal of
Rear earth elements (REE), Ce3+ and Nd3+, from aqueous
solutions. All synthesized nanofibers were characterized by FTIR and BET specific
surface areas, pore volumes and average pore diameters. Chemical stabilities
were studied in acidic conditions. Metals adsorption and binding kinetics were
measured in batch system for all materials.


Metal adsorption capacities were in high
level in all the materials. The case of PAN-pim, the nickel capacity at pH 5
was 0.8 mmol/g whereas lead capacity for PAN-PyAMI was at pH 6 0.025 mmol/g. In
the case of REE removal, the binding capacities for PS-DGA and PET-DGA
nanofibers for Ce3+ were 1.1 and 0.7 mmol/g, respectively and for Nd3+,
2.3 and 0.5 mmol/g, respectively. Binding kinetics of PS-DGA and PET-DGA for Ce3+
and Nd3+ were relatively fast – equilibrium were attained for both
REE during 20 and 5 minutes, respectively. Chemical stabilities of the PS-DGA
and PET-DGAs were good in acidic conditions and metals were successfully
regenerated from the nanofibers and reused at least four adsorption-desorption
cycles without significant metal adsorption capacities lost. Adsorption rate of
nickel for PAN-pim was extremely fast; adsorption equilibrium was attained
during 1 minute. However, Chemical stability was not good. In the case of
PAN-PyAMI, neither chemical stability nor adsorption rate for lead removal was
not good.




Last updated on 2020-30-01 at 16:48