1 януари 2024
Machreki, M., Tyuliev, G., Zigon, D., Guo, Q., Chouki, T., Sobrido, A., Dimitrov, S., Emin, S.
(
Георги Тюлиев;
)
Abstract
Introduction of oxygen vacancies (OVs) has been investigated as a promising way to improve the electrical and catalytic characteristics of a hematite (?-Fe2O3) based photoelectrode. In this work, we develop a novel method for preparing porous Sn-doped ?-Fe2O3 (Sn:Fe2O3) thin films with intrinsic OVs. The procedure included spin-coating an iron precursor onto a fluorine-doped tin oxide (FTO) substrate, followed by thermal treatment at elevated temperatures. The influence of Sn dopant on the optoelectronic properties of ?-Fe2O3 was demonstrated by X-ray photoelectron spectroscopy and photoelectrochemical (PEC) measurements. The combined effect of OVs and Sn doping was found to play a synergistic role in reducing the charge recombination’s. The Sn:Fe2O3 photoanodes were used as a dual catalyst to oxidise water and break down an anti-inflammatory drug called 2-(4-isobutylphenyl)propanoic acid (IBPA). The Sn:Fe2O3 thin film with a 30-minute heat treatment time displayed the highest incident photon-to-current efficiency. For the first time, Sn:Fe2O3 thin films were utilised in the effective PEC degradation of IBPA employing peroxymonosulfate (PMS) under visible light illumination. The hydroxyl radicals (radical dotOH), singlet oxygen (1O2), photogenerated holes (h+), and sulfate radicals (SO4radical dot?) were discovered to be the main reactive species during PEC degradation. IBPA degradation and the formation of new compounds were verified using liquid chromatography-mass spectrometry. The Lepidium sativum L phytotoxicity test reveals that PEC-treated wastewater with IBPA exhibits decreased toxicity.
J. Photochem. Photobiol. A-Chem., 446, 1, Elsevier, 2024, ISSN:1873-2666, DOI:https://www.sciencedirect.com/science/article/pii/S2213343725000582, 1-10. JCR-IF (Web of Science):4.1 Q2 (Web of Science)
https://www.sciencedirect.com/science/article/pii/S1010603023005919
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