Photo-Fenton Treatment of a Pharmaceutical Industrial Effluent Under Safe pH Conditions

Natividad, Reyna; Mendoza, Arisbeth; Brewer, Sharon; Martínez, Sandra Luz; Pérez-Mazariego, J.L.; Novoa, Karen Adriana; Gómez-Oliván, Leobardo Manuel; Romero, Rubı́

doi:10.1007/698_2020_551

Cited by 2 publications

(1 citation statement)

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“…This is in concordance with previous reports on the degradation of organic compounds by AOP processes. 39 In another study, 40 where pillared clays were applied in a photo-Fenton process, it was demonstrated that the toxicity of the solution after treatment was related to an acidic pH rather than to the mineralization extent. In such a study, although an almost complete mineralization degree was attained under acidic conditions, the toxicity of the resulting solution was higher than that at circumneutral pH where only partial mineralization was achieved.…”

Section: Resultsmentioning

confidence: 99%

Al/Cu-PILC as a Photo-Fenton Catalyst: Paracetamol Mineralization

et al. 2022

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Pillared clays have shown to effectively catalyze the photo-Fenton process without the necessity of acidic conditions, which is a very attractive feature from the perspective of environmentally friendly processes, especially when high natural abundance of chemical elements are incorporated. In this work, the catalytic activity of Al/Cu interlayered pillared clays for the degradation and mineralization of paracetamol through a photo-Fenton-like process was investigated. Al/Cu-pillared clays were prepared by adding ane Al/Cu pillaring solution to a bentonite suspension. X-ray diffraction (XRD) confirmed the enlargement of the interlayer space of the clay provoked by the pillaring process and Al and Cu species in the prepared samples were verified by atomic absorption spectroscopy (AAS). The specific surface area of pure bentonite was 2-fold increased after the Al/Cu pillaring process. A synthetic paracetamol solution with an initial concentration of 100 ppm was prepared for the assessment of the activity of the prepared materials. Different catalyst concentrations were tested (0.2, 0.5, 0.75, and 1 g L –1 ) and the complete removal of paracetamol was achieved in all cases, but the highest mineralization rate (69.8 mg total organic carbon (TOC) g cat –1 h –1 ) corresponds to the catalyst loading of 0.5 g L –1 . An ultraviolet-C (UVC) light source was employed, and no adjustment of the pH to acidic conditions was needed to achieve these results. Liquid chromatography coupled to mass spectroscopy (LC-MS) was employed to identify the reaction intermediates of paracetamol degradation. A proposed pathway for the oxidation of paracetamol molecule is presented. The effect of Cu content in the pillared clay and the stability and reusability of the catalyst were also assessed. The kinetic constants of paracetamol removal were 0.2318 and 0.0698 min –1 , under photo-Fenton and UV + H 2 O 2 processes, respectively.

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Section: Resultsmentioning

confidence: 99%