Wastewater treatment via H2O2 activation and 4-nitrophenol oxidation with iron-doped nickel-azolate frameworks

• Published in: Inorganic chemistry communications Vol. 166; p. 112671
• Main Authors: Martín, Nuria, López-Maya, Elena, Maireles-Porcar, Miguel, Álvarez, Mayra G., Llorca, Jordi, Altava, Belén, García-Verdugo, Eduardo, Cirujano, Francisco G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-08-2024
• Subjects: Catalyst; Fenton; H2O2; Iron; MOFs; Nitrophenol; Oxidation; Fenton; Nitrophenol; Iron; Oxidation; MOFs; H2O2; Catalyst
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2024.112671

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•Heterometallic Fe/Ni-organic framework allow the generation of reactive oxygen species.•H2O2 pretreatment of the framework reduces the iron (III) to redox-active iron (II) sites.•The catalyst can oxidize water pollutants at room temperature conditions.•Weak acidic conditions enhance the formation of iron coordinated hydroxyl anions and radicals.•The crystalline structure, composition and activity are maintained after several reaction cycles.
An advanced oxidation heterogeneous process completely degrades 4-nitrophenol in weak acid ambient aqueous conditions using post-synthetically iron-doped nickel azolate frameworks. The framework crystallinity, porosity and reactivity of the redox-active iron (II/III) sites, hydroxyl anions and radicals upon H2O2 pretreatment are discussed based on spectroscopic analysis of the reaction mixture and pretreated MOF.