Abstract
A novel electro-peroxone membrane filtration (EPMF) system was constructed based on catalytic •OH production and enhanced mass transport with a flow-through, carbon nanotube (CNT) membrane cathode. Scanning electron microscopic and conductive atomic force microscopic characterization affirmed that the CNT membrane possessed a compact nano-porous structure with high electrical conductivity and large catalytic area. The EPMF system removed ibuprofen, a typical ozone-resistant pharmaceutical and personal care product, by 95.75 ± 1.12%, which was 3.72, 1.97 and 1.60 folds greater than those obtained in separate electrochemical filtration, and ozonation/peroxone-coupled filtration, respectively. Moreover, electron spin resonance in conjunction of quantitative •OH measurements showed that IBU degradation was mainly associated with advanced oxidation by in-situ produced •OH. The CNT cathode played a critical role in catalyzing H2O2 and O3 decomposition, which synergistically promoted •OH formation during the EPMF process. These findings provided new insights into the applicability and mechanisms of EPMF for advanced drinking water treatment.
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