Preparation of a new green magnetic Fe3O4 @TiO2-P25 photocatalyst for solar advanced oxidation processes in water

A novel green method has been investigated to obtain a magnetic recoverable photocatalyst. Fe3O4 particles formed in situ by aerial oxidative precipitation of aqueous Fe(II) in the presence of terephthalate were bonded to TiO2-P25 nanoparticles, giving rise to a coupled semiconductor heterostructure...

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Bibliographic Details
Published in:Journal of environmental chemical engineering 2023-06, Vol.11 (3), p.109999, Article 109999
Main Authors: López, Jorge, Rey, Ana, Viñuelas-Zahinos, Emilio, Álvarez, Pedro M.
Format: Article
Language:English
Subjects:
Green synthesis
Magnetic hybrid photocatalyst
Metoprolol
Solar AOPs
TiO2-P25
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Summary:A novel green method has been investigated to obtain a magnetic recoverable photocatalyst. Fe3O4 particles formed in situ by aerial oxidative precipitation of aqueous Fe(II) in the presence of terephthalate were bonded to TiO2-P25 nanoparticles, giving rise to a coupled semiconductor heterostructure with superparamagnetic behavior at room temperature (Fe3O4 @TiO2-P25). The synthesis method is carried out in water at room temperature with almost full recovery and recycling of terephtalic acid. The prepared samples were fully characterized by XRD, TGA-DTA-MS, ATR-FTIR, WDXRF, TEM, SEM/EDX, N2 adsorption-desorption, elemental analysis, XPS, DRS, PL spectroscopy and SQUID. Photo-stability tests showed that Fe3O4 @TiO2-P25 does not undergo photodissolution under simulated solar radiation. The photocatalytic performance of Fe3O4 @TiO2-P25 was examined based on its ability to degrade aqueous metoprolol under UV–vis radiation in the presence of O2 and O3/O2. Also, the catalyst was successfully reused in six solar photocatalytic ozonation runs with negligible loss of photocatalytic activity. [Display omitted] •A novel magnetic Fe3O4 @TiO2-P25 hybrid photocatalyst was green synthetized.•The photocatalytic activity of Fe3O4 @TiO2-P25 under sunlight was mainly due to its TiO2-P25 content.•The photocatalyst showed excellent magnetic separability, stability and reusability in solar AOPs.•Fe3O4 @TiO2-P25 showed better performance in solar AOPs than other Fe3O4/TiO2 hybrid materials.•Efficient usage of ozone was observed in solar photocatalytic ozonation mediated by Fe3O4 @TiO2-P25.
ISSN:2213-3437
DOI:10.1016/j.jece.2023.109999