Tunable TiO2–BN–Pd nanofibers by combining electrospinning and atomic layer deposition to enhance photodegradation of acetaminophen
Résumé
The demand for fresh and clean water sources increases globally, and there is a need to
develop novel routes to eliminate micropollutants and other harmful species from water.
Photocatalysis is a promising alternative green technology that has shown great performance in
the degradation of persistent pollutants. Titanium dioxide is the most used catalyst owing to his
attractive physico-chemical properties, but this semiconductor presents limitations in the
photocatalysis process due to the high band gap and the fast recombination of the
photogenerated carriers. Herein, a novel photocatalyst has been developed, based on titanium
Page 1 of 51 Dalton Transactions
Dalton Transactions Accepted Manuscript Published on 06 January 2022. Downloaded by University of Montpellier on 1/17/2022 12:19:37 PM. View Article Online DOI: 10.1039/D1DT03715C
dioxide nanofibers (TiO2 NFs) synthesized by electrospinning. The TiO2 NFs were coated by atomic
layer deposition (ALD) to grow boron nitride (BN) and palladium (Pd) on their surface. The UV-Vis
spectroscopy measurements confirmed the increase of the band gap and the extension of the
spectral response to the visible range. The obtained TiO2/BN/Pd nanofibers were then tested for
photocatalysis, and showed a drastic increase of acetaminophen (ACT) degradation (>90%),
compared to only 20% degradation obtained with pure TiO2 after 4h of visible light irradiation.
The high photocatalytic activity was attributed to the good dispersion of Pd NPs on TiO2-BN
nanofibers, leading to a higher transfer of photoexcited charges carriers and a decrease of
photogenerated electron-holes recombination. To confirm their reusability, recycling tests on the
hybrid photocatalyst TiO2/BN/Pd have been performed, showing a good stability over 5 cycles
under UV and Visible light. Moreover, toxicity tests as well as quenching tests were carried out
to check the toxicity in the formation of byproductsand to determine active species responsible
for the degradation. The results presented in this work demonstrate the potential of TiO2/BN/Pd
nanomaterials, and open new prospects for the preparation of tunable photocatalysts.
Domaines
MatériauxOrigine | Fichiers produits par l'(les) auteur(s) |
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