Surface molecular imprinting of nylon fibers for chiral recognition of d‐phenyllactic acid

Abstract

In the current work, synthetic polyamide nylon fibers were modified via the strategy of surface molecular imprinting to develop enantio-selective adsorbent fabrics for chiral recognition of D-phenyllactic acid (D-PhLA). The nylon fibers were first modified by grafting of polyacrylamide and then the incorporated amide groups were converted into functional amino groups via treatment with NaOCl (Hofmann degradation). The amino-functionalized nylon fibers (Ny-NH 2 ) were interacted with the targeted D-PhLA enantiomer before crosslinking the amino-containing grafted chains with glutaraldehyde crosslinker followed by leashing the template D-PhLA out of the formed surface polymeric matrix by lowering the pH to 1 to finally produce the desired enantio-selective adsorbent fibers DP-Ny. Different instrumental methods such as elemental analysis, Fourier transform infrared spectroscopy, XRD and TGA were employed to examine all the synthetic procedures. SEM was also utilized to observe the morphological appearances of both native and modified nylon fibers. Moreover, the optimum extraction of D-PhLA was found to occur at pH 7. Isotherm studies of the prepared DP-Ny fibers obeyed the common Langmuir linear equation with q m values 130 ± 2 and 75 ± 1 mg g −1 in the case of D-PhLA and L-PhLA, respectively. Furthermore, the enantiomeric resolution of (±)-PhLA racemate was successfully carried out by a column technique with enantiomeric excess reaching approximately 78%.

Preparation, Characterization and Water Treatment Application of Electro-spun Polyamide 6 Nanocomposite

“…Where wg and wo are the weights of the electrospun nanofibrous membrane after and before grafting, respectively [19]. Scanning Electronic Microscope (SEM) and Transmittance Reflectance-FTIR were used to investigate the dried grafted electrospun fiber.…”

Fabrication of acrylic modified surface of polyamide 6/CaO electrospun nanofibrous membrane for effective dye removal

“…Then the temperature was adjusted to 60 o C and the graft polymerization was held under shaking for the desired time (2h). After that, the modified electrospun fiber was separated and washed with distilled water to remove the homopolymer and the unreacted materials [24]. The obtained grafted copolymer PA6-g-MAA and PA6/ CaO-g-MAA nanofibrous membrane were then dried at 40∘C for 12h and weighed to determine the grafting percentage according to Eqn(1).…”

“…where A and B are the weights of the electrospun nanofibrous membrane after and before grafting respectively [24].…”

“…B where A and B are the weights of the electrospun fiber after grafting and the electrospun fiber before grafting respectively [24]. It was detected that the grating percentage in the case of PA6 and PA6/ CaO were 27% and 43%, respectively.…”