Ageing of polyethersulfone/polyvinylpyrrolidone blends in contact with bleach water
| Autor: | Agnès Rivaton, Jean-Luc Gardette, Sandrine Therias, Romain Prulho |
|---|---|
| Přispěvatelé: | Photochimie, Institut de Chimie de Clermont-Ferrand (ICCF), Institut de Chimie du CNRS (INC)-SIGMA Clermont (SIGMA Clermont)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-SIGMA Clermont (SIGMA Clermont)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Bonnefoy, Stéphanie |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Polyethersulfone Polyvinylpyrrolidone Ageing Bleach water Hypochlorite Radical oxidation Polymers and Plastics Bleach Ultrafiltration Hypochlorite chemistry.chemical_element 02 engineering and technology macromolecular substances 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Polymer chemistry Materials Chemistry Chlorine medicine 0105 earth and related environmental sciences Polyvinylpyrrolidone technology industry and agriculture 021001 nanoscience & nanotechnology Condensed Matter Physics 6. Clean water Membrane chemistry Chemical engineering Mechanics of Materials Sodium hypochlorite Water treatment 0210 nano-technology human activities medicine.drug |
| Zdroj: | Polymer Degradation and Stability Polymer Degradation and Stability, Elsevier, 2013, 98, pp.1164-1172 Polymer Degradation and Stability, 2013, 98, pp.1164-1172 |
| ISSN: | 0141-3910 1873-2321 |
| Popis: | International audience; Polyethersulfone/polyvinylpyrrolidone (PES/PVP) ultrafiltration membranes are widely used to produce safe drinking water. Chemicals such as bleach are necessary to clean membranes; however, they are suspected of playing an important role in membrane ageing. To improve our understanding of how hypochlorite cleaning solutions affect filtration membranes, PES, PVP and thin films of PES/PVP blends have been aged by soaking in bleach water. This study was performed using 4000 ppm of free chlorine with a controlled pH of 8 and 12. Any modifications of the chemical structure of the thin films (w40 mm) were analysed using infrared spectroscopy and any modifications to the molecular weight of the polymers were determined via size-exclusion chromatography. In addition, the involvement of a radical oxidation process was investigated by contacting the materials with OH radicals generated by the irradiation of a titanium dioxide suspension. The results demonstrated that the degradation of PES/PVP blends in bleach water (sodium hypochlorite solution) involved radical oxidation of the PVP component, which promoted oxidation of the PES component. This work allowed a mechanism for the degradation of hollow fibre ultrafiltration membranes based on PES (95%) and PVP (5%) in contact with hypochlorite cleaning solutions to be proposed. |
| Databáze: | OpenAIRE |
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