Analysis of the Restructuring of the Active Layer of UAM-50 and UAM-100 Membranes during the Ultrafiltration Separation of Surfactant Solutions

Abstract

It is established that the fractions of the characteristic intensities of OH group vibrations attributed to intramolecular H-bonds of O3–H···O5 and O2–H···O6 types and intermolecular H-bonds of O6–H···O3 type of air-dried samples are 0.12, 0.1, and 0.2 for UAM-100 membrane and 0.12, 0.1, and 0.19 for UAM-50 membrane. It is shown that the characteristic intensity of the ν(OH) absorption band grows from 9.55 to 10.3 in a working sample of the UAM-100 membrane and a drop in the symmetry index to 0.75 was explained by the oxidation of aldehyde groups at C1 pyranose ring to the carboxyl (–COOH). It is proved that the fractions of intermolecular bonds of О6–Н···О3 and intramolecular H-bonds of O3–H···O5 and O2–H···O6 are 0.15, 0.09, and 0.13 that indicates not only the structural rearrangement of the hydrogen bond system but also possibly the formation of weak hydrogen bonds between hydroxyl groups of pyranose rings and molecules of the sedimentary layer.