Tyrosol removal by photo-Fenton-like process using CaAlFe mixed oxides synthesized via hydrocalumite from aluminum salt cake

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Jiménez, A (Author) Other; Esteves, BM (Author) Other; Trujillano, R (Author) Other; Soria, M. A. (Author) FEUP; Luis Madeira (Author) FEUP; Rives, V (Author) Other; Vicente, MA (Author) Other

Journal

Title: Journal of Environmental Chemical Engineering

Vol. 12

ISSN: 2213-3437

Publisher: Elsevier

Indexing

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Other information

Authenticus ID: P-010-4XY

DOI: 10.1016/j.jece.2024.112423

Abstract (EN): Solids with potential application in tyrosol (Ty) removal by photo-Fenton processes have been synthesized using aluminum salt cake as a source. Two series of hydrocalumite layered double hydroxides (LDH) were synthesized: one containing structural Fe3+ (occupying octahedral positions in the LDH) and another containing surface impregnated Fe3+; all solids were calcined in air at 750 degrees C. The solids were characterized by powder X-ray diffraction, FT-infrared spectroscopy, thermal analysis, N2 adsorption-desorption isotherms at -196 degrees C, particle size distribution and electron microscopy. One of the main differences between the two series was that Fe3+ impregnation by the incipient wetness method and subsequent calcination at 750 degrees C did not lead to the formation of CaAlFe mixed oxides. The calcined solids were evaluated as photocatalysts in the photo-Fenton process for Ty removal (a typical compound found in olive oil mill wastewater), the samples containing surface Fe3+ showing better results. The solid prepared by impregnation of hydrocalumite with 20% iron and subsequently calcined at 750 degrees C, under the optimum reaction conditions (catalyst dose = 0.5 g/L, [H2O2] = 0.468 g/L and [Ty]0 = 100 mg/L, in the presence of UV light), reached complete Ty removal with contaminant mineralization of 95% after only 60 min reaction. The cyclic study showed that this sample maintained its stability after 3 cycles of reuse without iron leaching, and a better performance than other materials reported in the literature.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14