期刊
POLYMER DEGRADATION AND STABILITY
卷 161, 期 -, 页码 131-138出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2019.01.017
关键词
Ultrafiltration; Membrane aging; Sodium hypochlorite; PES/PVP membrane; 2DCoS; FTIR-Mapping
It is well recognized that chlorine is responsible for aging of membrane materials. The goal of this study is to investigate the modifications of a commercial PES/PVP hollow fiber membrane exposed to hypochlorite solution at pH 7.5 by continuous filtration. Thanks to ATR-FFIR 2D Correlation Spectroscopy (2DCoS) analysis it was confirmed that PVP is oxidized into succinimide compound. 2DCoS analysis revealed the sequence order of PES/PVP membrane degradation: PVP oxidation is followed by the modifications of C-H cyclic structures and finally the formation of succinimide compounds. ATR-FTIRmicroscopy mapping unveiled that PVP was mainly situated at the inner surface of hollow fibers exhibiting initially a 67 mu m thickness layer. PVP layer disappearance was not homogenous versus the exposure dose suggesting the topochemical character of the PVP-chlorine reaction. Results demonstrate that advanced material characterization are key methodologies to understand membrane aging mechanisms. (C) 2019 Elsevier Ltd. All rights reserved.
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