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Efficient photocatalytic remediation of persistent organic pollutants using magnetically recoverable spinel manganese ferrite nanoparticles supported on activated carbon
Ist Teil von
Materials research bulletin, 2024-10, Vol.178, Article 112913
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2024
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
•MFO dispersed on AC were prepared by simple gel combustion from low-cost precursors.•Paramagnetic MFC can be recovered from solution by applying an external magnet.•AC supports limited particle agglomeration and enhanced photocatalytic activity of MFO.•MFC (Eg = 2.02 eV) efficiently removed ≥90 % of PCP within 2.5 h under mild conditions.•Study on active species and degradation mechanism showed crucial roles of e¯ and •OH.
Magnetically recoverable spinel manganese ferrite (MFO) nanoparticles (NPs) supported on activated carbon (AC) (MFC), a promising photocatalyst, were prepared by simple and cost-effective gel combustion. AC supports prevented particle agglomeration and functioned as electron acceptors to promote charge separation on MFO. MFC samples demonstrated significant surface area, paramagnetic characteristics, and visible-light absorption bandgap of 2.02 eV. Pentachlorophenol (PCP) photodegradation using MFC showed degradation efficiency of at least 90 % after 150 min at pH 6.0 with the catalyst dose and PCP concentration of no more than 10 mg.L−1 and 9.0 ppm, respectively. MFC exhibited durability and recyclability with approximately 4 % decrease in degradation efficiency after five reuses while maintaining its material structure. The crucial roles of photo-generated electrons and hydroxyl radicals related to dechlorination and hydroxylation during PCP photodegradation were also highlighted in active species investigations with appropriate scavengers. Subsequently, a plausible PCP photodegradation mechanism with intermediates was proposed.
The MnFe2O4 nanoparticles with cubic spinel structure dispersed on activated carbon were prepared by the gel-combustion method from low-cost precursors and used as a magnetically recoverable photocatalyst for the degradation of persistent organic pollutants in wastewater. [Display omitted]