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Application and characterization of electroactive membranes based on carbon nanotubes and zerovalent iron nanoparticles

Title data

Yanez H., Jorge E. ; Wang, Zi ; Lege, Sascha ; Obst, Martin ; Roehler, Sebstian ; Burkhardt, Claus J. ; Zwiener, Christian:
Application and characterization of electroactive membranes based on carbon nanotubes and zerovalent iron nanoparticles.
In: Water Research. Vol. 108 (January 2017) . - pp. 78-85.
ISSN 0043-1354
DOI: https://doi.org/10.1016/j.watres.2016.10.055

Abstract in another language

Carbon nanotube (CNT) membranes were produced from multi-walled CNTs by a filtration technique and used for the removal of the betablocker metoprolol by adsorptive and reactive processes. The reactivity of CNT membranes was enhanced by nanoparticulate zero-valent iron (NZVI) which was deposited on the CNT membranes by pulsed voltammetry applying defined number of pulses (Fe-CNT (100) and Fe-CNT (400) membranes). Surface analysis with SEM showed iron nanoparticle sizes between 19 and 425 nm. Pore size distribution for the different membranes was determined by capillary flow porometry (Galwick fluid). Pore size distribution for all membranes was similar (40 nm), which resulted in a water permeability typical for microfiltration membranes. Metoprolol was removed by the CNT membrane only by sorption, whereas the Fe-CNT membrane revealed also metoprolol degradation due to Fenton type reactions. Further application of electrochemical potentials on both the CNT and the Fe-CNT membranes improved the removal efficiencies to 74% for CNT membranes at 1 V and to 97% for Fe-CNT (400) membranes at 1 V. Seven transformation products have been identified for metoprolol by high-resolution mass spectrometry when electrochemical degradation was performed with CNT and Fe-CNT membranes. Additionally, two of the identified transformation products (TPs) were also observed for Fe-CNT membranes without the application of electrochemical potential. However, only 10% of the degraded metoprolol could be explained by the formation of TPs.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER140425
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Heisenberg Professorship - Experimental Biogeochemistry > Heisenberg Professorship - Experimental Biogeochemistry - Univ.-Prof. Dr. Martin Obst
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Heisenberg Professorship - Experimental Biogeochemistry
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 12 Jan 2018 07:02
Last Modified: 15 Sep 2020 08:53
URI: https://eref.uni-bayreuth.de/id/eprint/41290