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Article Abstract
Unique Fe and N co-doped multi-walled carbon nanotubes are designed to efficiently catalyze the oxygen reduction reaction (ORR). The preparation processes involve surface functionalization, subsequent wet impregnation and final thermal fixation of Fe-Nx species. The catalyst achieved outstanding alkaline ORR performance with a very positive half-wave potential (∼0.91 V). Theoretical calculations show that the carbon layer below the active Fe-Nx sites is beneficial to the ORR.
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Article Synopsis
- An Fe and N co-doped carbon nanotube (CNT) was created using a hydrothermal method, and its properties were analyzed using several techniques like scanning electron microscopy and X-ray photoelectron spectroscopy.
- The catalytic activity for degrading acetaminophen (ACT) was found to be highest in Fe-CNT, followed by N-CNT, Fe/N-CNT, and then CNT, achieving over 98.4% ACT removal, regardless of initial pH.
- The study concludes that the Fe/N-CNT plus persulfate system is effective for breaking down tough organic pollutants in water, utilizing a non-radical reaction pathway for improved performance and stability, though its effectiveness can be hindered by natural organic matter.