Polyacrylonitrile (PAN)/crown ether composite nanofibers for the selective adsorption of cations

Abstract

In this study, we prepared electrospun polyacrylonitrile (PAN) nanofibers functionalized with dibenzo-18-crown-6 (DB18C6) crown ether and showed the potential of these fibers for the selective recovery of K + from other both mono-and divalent ions in aqueous solutions. Nanofibers were characterized by SEM, FTIR and TGA. SEM results showed that the crown ether addition resulted in thicker nanofibers and higher mean fiber diameters, in a range of 138 to 270 nm. Batch adsorption experiments were conducted in order to evaluate the potential of the crown ether modified nanofibers as an adsorbent for ion removal. The maximum adsorption capacity of the crown ether modified nanofibers for K + was 0.37 mmol g À1 and the nanofibers followed the selectivity sequence of K

Effective removal of cesium by pristine graphene oxide: performance, characterizations and mechanisms

“…No signicant chemical shis in the O1s spectra could be observed aer Cs sorption. This is also in the same trend as that in the work by S. Tas et al 39 where they have measured XPS spectra of alkali cations adsorbed onto the crown ether graed polyacrylonitrile ber, but no signicant shi in the C1s or O1s spectra of the spent sorbent could be observed.…”

Significantly Enhanced Uranium Extraction from Seawater with Mass Produced Fully Amidoximated Nanofiber Adsorbent

“…The survey X‐ray photoelectron spectroscopy (XPS) spectrum of PAN shown in Figure b exhibit two intense peaks at 285.6 and 398.6 eV corresponding to C 1s and N 1s core levels, respectively. The C 1s core spectra of PAN can be cure‐fitted to three peaks at 284.95, 284.40 and 283.85 eV that belong to the CH, CC, and CN groups, respectively (Figure S1, Supporting Information). Compared with that of the survey spectrum of PAN, the intensity of the O 1s peak in PIDO spectrum is significantly increased, the peak shifts to a slightly higher binding energy, centered at 532.6 eV, which belong to the NOH of amidoxime and/or imidedioxime groups.…”

“…After amidoximation, the disappearance of this CN peak together with the appearance of CN (1638 cm −1 ), CN (1381 cm −1 ), and NO (933 cm −1 ) in PIDO verify the conversion of nitrile groups to amidoxime and/or cyclic imidedioxime groups (Figure 1a). The C 1s core spectra of PAN can be cure-fitted to three peaks at 284.95, 284.40 and 283.85 eV that belong to the CH, CC, and CN groups, [33] respectively ( Figure S1, Supporting Information). The survey X-ray photoelectron spectroscopy (XPS) spectrum of PAN shown in Figure 2b exhibit two intense peaks at 285.6 and 398.6 eV corresponding to C 1s and N 1s core levels, respectively.…”

Polystyrene/poly(dibenzo-18-crown-6) composite nanofibers for the selective adsorption of plasma catecholamines

“…Tas et al reported the recovery of K + in aqueous solutions by using electrospun PAN nanobers functionalized with DB18C6. 17 However, a low efficiency of the PS-DB18C6 composite nanober was obtained in this study. The reason was probably because the PFSPE column was pretreated with methanol, and the solubility of DB18C6 in methanol led to insufficient adsorption sites for CAs.…”

“…16 Recently, Tas et al used electrospun PAN nanobers functionalized with DB18C6 crown ether to recover of K + from other ions in aqueous solutions. 17 As far as is known, this is one of the few published studies that indicate the application of electrospinning technology in spinning composite nanobers doped with crown ether for adsorption and separation. Based on the high K + ion binding ability of DB18C6, this study constructed selective adsorption sites for K + ion via electrospinning polymer nanobers doped with DB18C6 monomer.…”