Peracetic acid activated by nickel cobaltite as effective oxidizing agent for BPA and its analogues degradation

• Published in: Chemosphere (Oxford) 2024-04, Vol.354, p.141684-141684, Article 141684
• Main Authors: Kiejza, Dariusz, Piotrowska-Niczyporuk, Alicja, Regulska, Elżbieta, Kotowska, Urszula
• Format: Article
• Language: English
• Subjects: Araceae; Benzhydryl Compounds; Bisphenols; Heterogeneous catalyst; Hydrogen Peroxide; Minerals; Nickel; Oxidants; Oxidation-Reduction; Peracetic Acid; Phenols; Toxicity; Water and wastewater treatment; Water Pollutants, Chemical
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2024.141684

The presented research concerns the use of nickel cobaltite nanoparticles (NiCo2O4 NPs) for the heterogeneous activation of peracetic acid and application of NiCo2O4-PAA system for degradation 10 organic micropollutants from the group of bisphenols. The bisphenols removal (initial concentration 1 μM) process was optimized by selecting the appropriate process conditions. The optimal amount of catalyst (115 mg/L), peracetic acid (PAA) concentration (7 mM) and pH (7) were determined using response surface analysis in the Design of Experiment. Then, NiCo2O4 NPs were used to check the possibility of reuse in subsequent oxidation cycles. The work also attempts to explain the mechanism of oxidation of the studied micropollutants. The participation of the sorption process on the catalyst was excluded and based on the experiments with radical scavengers it can be concluded that the oxidation proceeds in a radical pathway, mainly with participation of O2•- radicals. Experiments conducted in real water matrices exhibit low impact on degradation efficiency. Toxicity tests with green alga Acutodesmus obliquus and aquatic plant Lemna minor showed that post-reaction mixture influenced growth and the content of photosynthetic pigments in concentration dependent manner. [Display omitted] •Nickel cobaltite is effective PAA activator to degrade organic micropollutants.•The oxidation efficiency of bisphenols reaches 100% after 5 min.•Superoxide anions are the main oxidizing species for bisphenols degradation.•The post-reaction mixture shows some concentration-dependent toxicity.