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Graphite-N reinforced sludge biochar electrode: A experimental and DFT theoretical analysis of efficient evolution and in-situ utilization of H2O2.
- Source :
- Environmental Pollution; Aug2024, Vol. 355, pN.PAG-N.PAG, 1p
- Publication Year :
- 2024
-
Abstract
- Rational reuse of municipal sludge to produce electro-Fenton electrode can not only save resources, but also produce superior peroxide and degradation pollutants simultaneously. Herein, a novel electro-Fenton electrode derived from sludge biochar loaded on Ni foam (SBC@Ni) was constructed via high temperature pyrolysis and chemical coating for efficient H 2 O 2 evolution and pollutant degradation. Systematic experiments and density functional theory calculations (DFT calculation) explained that the production of graphite C and graphite N during high-temperature pyrolysis of municipal sludge can greatly enhance the oxygen reduction reaction of SBC@Ni electrode and promote the evolution of H 2 O 2. And the hybrid heterojunctions, such as FeP, also played a key role in electrocatalytic processes. Notably, the electrode still exhibited excellent performance after 1000 linear scans and 12 h of continuous current stimulation, which demonstrated the excellent stability of the electrode. Moreover, SBC@Ni electrode can not only effectively oxidize 4-chlorophenol through the electro-Fenton effect, but also fully mineralize organic matter, indicating promising environmental application. The free radical quenching experiment also revealed that the ·OH is the main active species for 4-CP degradation in SBC@Ni electro-Fenton system. [Display omitted] • The Ni biochar electrode effectively promoted the electro-Fenton reaction. • High-temperature pyrolysis contributed to the formation of Graphite-C/N. • DFT proved that Graphite-C/N can accelerate the 2e<superscript>–</superscript> ORR reaction. • Sludge biochar electrodes can efficiently and stably degrade and mineralize 4-CP. [ABSTRACT FROM AUTHOR]
- Subjects :
- BIOCHAR
ELECTRODES
DENSITY functional theory
CARBON foams
OXYGEN reduction
Subjects
Details
- Language :
- English
- ISSN :
- 02697491
- Volume :
- 355
- Database :
- Supplemental Index
- Journal :
- Environmental Pollution
- Publication Type :
- Academic Journal
- Accession number :
- 177758440
- Full Text :
- https://doi.org/10.1016/j.envpol.2024.124107