Hollow sea-urchin-shaped carbon-anchored single-atom iron as dual-functional electro-Fenton catalysts for degrading refractory thiamphenicol with fast reaction kinetics in a wide pH range
“…As discussed above, the incorporation of single-atom Fe into porous carbon significantly improves its ORR activity, whereas the single-atom Cu doping not only accelerates 4-CP electroreduction dechlorination but also facilitates H 2 O 2 production from O 2 reduction. Benefiting from the highly unsaturated coordination of single-atom Fe that can fast adsorb H 2 O 2 , , FeCuSA-NPC continuously catalyze H 2 O 2 to form ·OH radicals at a high production rate. Therefore, the enhanced EF activity toward 4-CP degradation on FeCuSA-NPC can be attributed to the atomic-distributed Fe, Cu, and N-doped porous carbon.…”
Chlorinated
organic pollutants are highly toxic and widespread
in the environment, which cause ecological risk and threaten the human
health. Chlorinated pollutants are difficult to degrade and mineralize
by the conventional advanced oxidation process as the C–Cl
bond is resistant to reactive oxygen species oxidation. Herein, we
designed a bifunctional Fe/Cu bimetallic single-atom catalyst anchored
on N-doped porous carbon (FeCuSA-NPC) for the electro-Fenton process,
in which chlorinated pollutants are dechlorinated on single-atom Cu
and subsequently oxidized by the ·OH radical produced from O2 conversion on single-atom Fe. Benefitting from the synergistic
effect between dechlorination on single-atom Cu and ·OH oxidation
on single-atom Fe, the chlorinated organic pollutants can be efficiently
degraded and mineralized. The mass activity for chlorinated organic
pollutant degradation by FeCuSA-NPC is 545.1–1374 min–1 gmetal
–1, excessing the highest value
of the reported electrocatalyst. Moreover, FeCuSA-NPC is demonstrated
to be pH-universal, long-term stable, and environment friendly. This
work provides a new insight into the rational design of a bifunctional
electrocatalyst for efficient removal of chlorinated organic pollutants.
“…As discussed above, the incorporation of single-atom Fe into porous carbon significantly improves its ORR activity, whereas the single-atom Cu doping not only accelerates 4-CP electroreduction dechlorination but also facilitates H 2 O 2 production from O 2 reduction. Benefiting from the highly unsaturated coordination of single-atom Fe that can fast adsorb H 2 O 2 , , FeCuSA-NPC continuously catalyze H 2 O 2 to form ·OH radicals at a high production rate. Therefore, the enhanced EF activity toward 4-CP degradation on FeCuSA-NPC can be attributed to the atomic-distributed Fe, Cu, and N-doped porous carbon.…”
Chlorinated
organic pollutants are highly toxic and widespread
in the environment, which cause ecological risk and threaten the human
health. Chlorinated pollutants are difficult to degrade and mineralize
by the conventional advanced oxidation process as the C–Cl
bond is resistant to reactive oxygen species oxidation. Herein, we
designed a bifunctional Fe/Cu bimetallic single-atom catalyst anchored
on N-doped porous carbon (FeCuSA-NPC) for the electro-Fenton process,
in which chlorinated pollutants are dechlorinated on single-atom Cu
and subsequently oxidized by the ·OH radical produced from O2 conversion on single-atom Fe. Benefitting from the synergistic
effect between dechlorination on single-atom Cu and ·OH oxidation
on single-atom Fe, the chlorinated organic pollutants can be efficiently
degraded and mineralized. The mass activity for chlorinated organic
pollutant degradation by FeCuSA-NPC is 545.1–1374 min–1 gmetal
–1, excessing the highest value
of the reported electrocatalyst. Moreover, FeCuSA-NPC is demonstrated
to be pH-universal, long-term stable, and environment friendly. This
work provides a new insight into the rational design of a bifunctional
electrocatalyst for efficient removal of chlorinated organic pollutants.
The electro-Fenton (EF) process was first proposed in 1996 and, since then, considerable development has been achieved for its application in wastewater treatment, especially at lab and pilot scale. After more than 25 years, the high efficiency, versatility and environmental compatibility of EF process has been demonstrated. In this review, bibliometrics has been adopted as a tool that allows quantifying the development of EF as well as introducing some useful correlations. As a result, information is summarized in a more visual manner that can be easily analyzed and interpreted as compared to conventional reviewing. During the recent decades under review, 83 countries have contributed to the dramatic growth of EF publications, with China, Spain and France leading the publication output. The top 12 most cited articles, along with the top 32 most productive authors in the EF field, have been screened. Four stages have been identified as main descriptors of the development of EF throughout these years, being each stage characterized by relevant breakthroughs. To conclude, a general cognitive model for the EF process is proposed, including atomic, microscopic and macroscopic views, and future perspectives are discussed.
Graphical abstract
Supplementary Information
The online version contains supplementary material available at 10.1007/s42823-022-00420-z.
“…The development of these materials may allow one to overcome the mentioned limitations of homogeneous and heterogeneous electrochemical Fenton-based processes. For example, Zhang et al [72] evaluated the use of a hollow sea-urchin-shaped carbon-anchored single-atom Fe (SAFe x @HSC) derived from MOFs as a dual functional EF catalyst. The electrochemical production of H 2 O 2 using SAFe x @HSC derived from MOF showed excellent OER with an improvement in activity and selectivity toward two electrons reduction, which produced H 2 O 2 .…”
Section: Mofs As Indirect Catalysts For Electrochemical Fenton-like Processesmentioning
Metal–organic-frameworks (MOFs) are emerging materials used in the environmental electrochemistry community for Faradaic and non-Faradaic water remediation technologies. It has been concluded that MOF-based materials show improvement in performance compared to traditional (non-)faradaic materials. In particular, this review outlines MOF synthesis and their application in the fields of electron- and photoelectron-Fenton degradation reactions, photoelectrocatalytic degradations, and capacitive deionization physical separations. This work overviews the main electrode materials used for the different environmental remediation processes, discusses the main performance enhancements achieved via the utilization of MOFs compared to traditional materials, and provides perspective and insights for the further development of the utilization of MOF-derived materials in electrified water treatment.
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