Improvement of ferrioxalate assisted Fenton and photo-Fenton processes for paracetamol degradation by hydrogen peroxide dosage

• Published in: Environmental science and pollution research international 2024-02, Vol.31 (9), p.13489-13500
• Main Authors: Giménez, Bárbara N., Conte, Leandro O., Duarte, Sofía A., Schenone, Agustina V.
• Format: Article
• Language: English
• Subjects: acetaminophen; Analgesics; Anions; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Benzoquinone; Degradation; Design of experiments; Dosage; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Experimental design; Groundwater; Hydrogen peroxide; Hydroquinone; Industrial wastes; Industrial wastewater; Organic compounds; Paracetamol; Research Article; solar radiation; Waste Water Technology; Wastewater; Water analysis; Water Management; Water Pollution Control; Water sampling
• ISSN: 1614-7499; 0944-1344; 1614-7499
• DOI: 10.1007/s11356-024-32056-z

This work aimed to investigate the impact of hydrogen peroxide (HP) punctual dosage on paracetamol (PCT) degradation, through Fenton and photo-Fenton processes under near-neutral pH conditions, using ferrioxalate and artificial sunlight. The assays were performed using a D-optimal experimental design, to statistically evaluate the influence of radiation (ON or OFF), HP concentration (94.5–756 mg L −1 ), and HP dosage (YES or NO), on PCT conversion. The optimal conditions determined from the study were: HP = 378 mg L −1 , DOS = YES, and RAD = ON, achieving a predicted PCT conversion of 99.68% in 180 min. This result obtained from the model was very close to the experimental one (98.80%). It was verified that HP dosage positively influenced the iron catalytic cycle since higher Fe 2+ concentrations were reached at shorter reaction times, accelerating not only PCT conversion but also its by-products hydroquinone and 1,4-benzoquinone, leading to better performances of Fenton and photo-Fenton reactions. Under optimal conditions and employing real water matrices (an artificial matrix with inorganic anions, a real groundwater sample, and a synthetic industrial wastewater), HP dosage demonstrated the ability to mitigate the negative effects caused by the content of different ions and other organic compounds and significantly improve HP consumption in challenging wastewater conditions.