Modified Electro-spun Polyvinyl Alcohol Nanofibers Used as Super Adsorbing Material for Lead Ions in Aqueous Solution

Abstract

Polyvinyl alcohol nanofibers (PVA) and novel polyvinyl alcohol nanofibers incorporated with cobalt metal organic framework (PVA/Co-MOF) sorbents were produced via electrospinning. The produced nanofibers were confirmed by scanning electron microscope (SEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR). SEM images showed consistent and beads free nanofibers were synthesized. FTIR spectra's exhibited shifts in critical functional groups positions thus it confirmed that there was a given amount of cobalt metal organic frameworks implanted in the incorporated nanofibers. TGA plots also confirmed that PVA/MOF nanofibers exhibited higher decomposition temperatures than that of the pure polyvinyl alcohol nanofibers. Therefore, it affirmed the amalgamation between cobalt metal organic frameworks and polyvinyl alcohol nanofibers. The ability of PVA and novel PVA/Co-MOF nanofibers to remove Pb 2+ ions from solution was investigated. The sorption Pb 2+ ions on incorporated nanofibers (novel PVA/Co-MO) were two-fold as compared to the pure polyvinyl alcohol nanofibers. The thermodynamic parameters: Gibbs free energy (ΔG°) and apparent enthalpy (ΔH°) showed that the adsorption Pb 2+ ions onto the electro-spun nanofibers were spontaneous and exothermic.

Removal of heavy metals and pollutants by membrane adsorption techniques

“…The maximum bed loading capacity for 1 mg/L Cr(VI) filtration at the breakthrough point was found to be 16.5 mgchromium/g-chitosan, higher than the static adsorption capacity of 11.0 mg-chromium/g-chitosan using nanofiber mats, indicating the membranes' better potential for dynamic adsorption. Shooto et al (2016) fabricated nanofibers via electrospun, from polyvinyl alcohol (PVA) and PVA incorporated with metal (Co) organic framework (PVA-Co-MOF), and investigated the ability of these fibers to remove Pb(II) ions from water. It was reported that the sorption of Pb 2+ ions on PVA-Co-MOF) were twice as compared to the PVA nanofiber.…”

Poly(vinyl alcohol)/Melamine Composite Containing LATP Nanocrystals as a High-Performing Nanofibrous Membrane Separator for High-Power, High-Voltage Lithium-Ion Batteries

“…Conversely, a slight peak shift is observed at PVAM composite membrane (Figure S1b, curve b′), as compared to that of the pure PVAM nonwoven membrane. The peaks shift are mainly due to the Lewis acid–base interaction between the LATP filler (as a Lewis acid) and PVAM (as a Lewis base, −OH group side chain in PVA) polymer segments …”

“…The peaks shift are mainly due to the Lewis acid−base interaction between the LATP filler (as a Lewis acid) and PVAM (as a Lewis base, −OH group side chain in PVA) polymer segments. 39 Figure S1c shows the TGA curves of the PVAM composite membrane (curve a′) and pure PVAM membrane (curve b′). Three stages of weight loss were observed in the TGA curve for both the as-prepared PVAM composite membrane and the pure PVAM membrane.…”

Metal–organic frameworks (MOFs) based nanofiber architectures for the removal of heavy metal ions

“…Almost all adsorption kinetics are better matched with the pseudo-second-order model, as evidenced by the better correlation coefficients compared to the pseudo-rst-order model. 89,90,93 In a study by Peng et al, 85 the adsorption data of ZIF-8-PAN NF for Cu(II) were adapted to a pseudo-second-order model (R 2 ¼ 0.967). The agreement of the kinetic data with this kinetic model suggests that the adsorption of HMIs on MOFs in aqueous solutions can be controlled by chemical adsorption.…”

“…Shooto et al 90 described an electrospinning method for producing PVA–Co-MOF sorbents by combining novel PVA nanofibers with a cobalt metal–organic framework. SEM images showed that homogeneous, bead-free nanofibers were developed.…”