Fe-based carbonitride as Fenton-like catalyst for the elimination of organic contaminants.

The Fenton-like process has been regarded as a clean and efficient approach to generate reactive oxygen species (ROS) to deal with the ever-growing environmental pollution. However, developing improved catalysts with adequate activity and stability remains a long-term goal for practical application. Herein, crystalline carbon nanotubes (CNTs) interconnected Fe/Fe 3 C-doped nanoporous carbonitride (Fe-NC) was easily prepared by the pyrolysis of ZIF-8 confined with Fe3+. The obtained Fe–NCs possessed high degrees of graphitic carbon and nitrogen. Such Fe–NCs can enhance the activation of peroxymonosulfate (PMS) for the removal of multiple organic contaminants. The optimized Fe-NC/PMS system exhibited impressive catalytic performance, with a TOF as high as 4.43 min−1 for 3BF degradation, and the removal efficiency of other dyes, phenols and antibiotics was up to 96.2% within 10 min. The removal efficiency of 3BF was 93.4% within 10 min with extremely low iron ions leaching (<0.052 mg/L) even after five cycles. In addition, the effects of pH on the catalytic performance demonstrated that the decomposition of 3BF exceeded 95.6% even when the initial pH varied from 5 to 10. We confirmed that SO 4 -, OH, O 2 - and 1O 2 were generated in the catalytic system of Fe-NC/PMS, which played a critical role in degrading the organics. These findings provide new insights into the design of environmental-friendly Fenton-like catalysts with high efficiency and favorable stability in environmental remediation. [Display omitted] • Carbon nanotubes interconnected Fe/Fe 3 C-doped carbonitride was facilely prepared. • This Fe-based catalyst possessed high graphitic carbon and nitrogen degree. • The Fe-NC/PMS system exhibited excellent performance for the removal of organics. • The degradation of pollutants was due to the generated SO 4 -, OH, O 2 - and 1O 2. [ABSTRACT FROM AUTHOR]