Ce2O3 and TiO2 p-n heterojunction for enhanced degradation of p-nitrophenol under visible light

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-27 DOI:10.1016/j.jphotochem.2025.116284

Antoine Farcy , Maxine Mathy , Louise Lejeune , Pierre Eloy , Sophie Hermans , Patrick Drogui , Julien G. Mahy

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Abstract

A sol–gel method is used to synthesize TiO₂, using few organic products. In order to increase the photocatalytic activity in the near visible range (395 nm), cerium is used as a dopant at various concentrations ranging from 0.03 mol% to 4.40 mol%. The addition of cerium leads to the formation of p-n heterojunctions between Ce₂O₃ and TiO₂, multiplying by 2 (under UV–visible light) or 2.6 (under visible light) the photocatalytic efficiency of the composite material with the best dopant amount, i.e. 0.06 mol% of cerium. X-ray diffraction showed the formation of TiO₂ in its anatase form, while nitrogen adsorption/desorption isotherms showed changes in specific surface area as a function of the percentage of cerium added. The presence of cerium (III) in the sample is confirmed by XPS and the amount is determined quantitatively by ICP. DRUS analysis highlights the difference in bandgap caused by the Ce₂O₃ incorporated into the sample. In order to compare the different photocatalysts obtained, the degradation of p-nitrophenol is tested in their presence in water under UV light as well as a wavelength close to the visible range, i.e. 395 nm. Finally, based on the results obtained by electron paramagnetic resonance, a photoactivation mechanism of the mixed oxide is proposed.

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来源期刊

Journal of Photochemistry and Photobiology A-chemistry 化学-物理化学

CiteScore

7.90

自引率

7.00%

发文量

580

审稿时长

48 days

期刊介绍： JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds. All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor). The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.