The investigation of the structure of the active layer of a nanofiltration membrane AMN-P by Fourier IR spectroscopy
Abstract
The analysis of the data on the IR spectroscopy of the surface of an AMN-P nanofiltration membrane showed that the location of the absorption bands and their intensity in the area of “fingerprints”, “functional groups” characterizes the polymer material as cellulose acetate (a material based on cellulose ether). It was found that the broadening of the absorption band in the range of wave numbers from ν=3100 up to 3720 cm-1 on the IR spectrum of the surface of the AMN-P nanofiltration membrane for an air-dry used sample and the shift of the peak of the absorption band with a decrease in intensity by 50% to the region of a larger wave number ν=3475 cm-1 (compared to the original sample ν=3356 cm-1) may indicate the presence of moisture in the sample and stretching of the intermolecular hydrogen bonds of the OH hydroxyl groups (as a result of membrane relaxation when the mechanical load was removed). The analysis and interpretation of the obtained data compared with the known literature on IR spectroscopy of the surface of the AMN-P nanofiltration membrane indicated the presence of stretching vibrations of C=O carbonyl groups (ν=1733 cm-1 (ν=1734 cm-1)) in the membrane samples , C-H bending vibrations of methyl СН3 and methylene СН2 groups) (ν=1366 cm-1 (ν=1367 cm-1), ν=1428 cm-1 (ν=1428 cm-1)) 1641 cm-1 (ν=1637 cm-1)), asymmetric stretching vibrations of C-O-C ester groups (ν=1224 cm-1 (ν=1221 cm-1), symmetrical to stretching vibrations of C-O-C groups due to the glycosidic bond between pyranose rings (ν=1025 cm-1 (ν=1033 cm-1)), bending vibrations of the pyranose ring corresponding to vibrations of the skeleton of the molecule (ν = 897 cm-1 - β-configuration of glycosidic bonds during the anomeric binding of pyranose rings), stretching vibrations of С–Н bonds in methylene СН2 and methyl СН3 groups of cellulose acetate (ν = 3000–2800 cm-1). It was found that for an air-dry (used) sample of the AMN-P membrane, the appearance of a "shoulder" in the range of wave numbers ν=2860-2900 cm-1 and a decrease in the intensity of the absorption band by ≈10-20% at the peak value of the wave number ν=2936, probably indicates a redistribution of the bonds of the СН2 functional groups in the cellulose acetate macromolecule as a result of membrane relaxation (when the mechanical load was removed) and the presence of stretching of intermolecular bonds between functional groups bound to CH2, CH3, including in the presence of adsorbed water.
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