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Temperature‐Modulated Water Filtration Using Microgel‐Functionalized Hollow‐Fiber Membranes

2014; Wiley; Volume: 53; Issue: 22 Linguagem: Inglês

10.1002/anie.201400316

1521-3773

Daniel Menne, Fee Pitsch, John E. Wong, Andrij Pich, Matthias Weßling,

Advanced Sensor and Energy Harvesting Materials

In the present work, we investigate the potential of aqueous polymer microgels in membrane technology, especially for filtration applications. The poly(N-vinylcaprolactam)-based microgels exhibit thermoresponsive behavior and were employed to coat hollow-fiber membranes used for micro- and ultrafiltration. We discuss the preparation of microgel-modified membranes (by "inside-out" as well as "outside-in" filtration in dead-end mode). The clean-water permeability and stability of these membranes was studied not only as a function of time, but also of temperature. The microgel-modified membranes exhibit a reversible thermoresponsive behavior whereby both the resistance and the retention increased with decreasing temperature.