Photocatalytic mitigation of rhodamine B dye over novel FeS2/CeO2 nanocomposites through step S-scheme mechanism

Photothermal nanoparticles are recent materials which provide additional capacity supply during the photocatalytic reactions. Iron disulfide (FeS 2 ) nanoparticles with unique chemical and optical properties effectively absorb the full broad spectrum and convert the solar energy into chemical energy...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2024-05, Vol.130 (5), Article 349
Main Authors: Heiba, Zein K., Ahmed, M. A., Elshimy, H., El-naggar, A. M.
Format: Article
Language:English
Subjects:
Absorption spectra
Cerium oxides
Characterization and Evaluation of Materials
Charge transport
Chemical energy
Condensed Matter Physics
Conduction bands
Current carriers
Decomposition
Diffuse reflectance spectroscopy
Dyes
Energy gap
Heterojunctions
Machines
Manufacturing
Nanocomposites
Nanoparticles
Nanotechnology
Optical and Electronic Materials
Optical properties
Photocatalysis
Photoluminescence
Physics
Physics and Astronomy
Processes
Pyrite
Redox reactions
Rhodamine
Sol-gel processes
Solar energy conversion
Spectrum analysis
Surfaces and Interfaces
Thin Films
Ultraviolet radiation
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Summary:Photothermal nanoparticles are recent materials which provide additional capacity supply during the photocatalytic reactions. Iron disulfide (FeS 2 ) nanoparticles with unique chemical and optical properties effectively absorb the full broad spectrum and convert the solar energy into chemical energy owing to its small band gap energy of 1.5 eV. However, the fast electron–hole pair recombination reduces the efficiency of FeS 2 and depresses the redox reaction. In this novel research, FeS 2 /CeO 2 heterojunctions are prepared for successful decomposition of rhodamine B dye as toxic pollutant belonging to xanthene dye group. CeO 2 nanoparticles are fabricated through sol–gel procedure via triton- × 100 as pore directing agent. Nanoparticle’s FeS 2 is developed by the precipitating process under a N 2 -atmospheric condition. Various amounts of FeS 2 particles were deposited in ultrasonic bath onto the surface of CeO 2 . The nanostructures, crystalline and optical properties of the solid specimens are evaluated by scanning and transmission electron microscopy (SEM and TEM) with Energy-dispersive X-ray spectroscopy (EDS), x-ray diffraction (XRD), photoluminescence (PL) and diffuse reflectance spectroscopy (DRS) techniques. The photocatalytic efficiency of CeO 2 , FeS 2 and various compositions of FeS 2 /CeO 2 heterojunction was deliberated via following the decomposition of rhodamine B dye under UV radiation at 365 nm. FeS 2 efficiently transfers the absorbability of the nanocomposite to deep visible region by decreasing the band gap energy of CeO 2 from 2.3 to 1.5 eV revealing that FeS 2 determines the optical properties of the nanocomposites. The charge transportation proceeds through type (I) heterojunction with accumulation of the massive charge carriers in the valence and conduction bands of FeS 2 nanoparticles. The novel nanocomposite with strong absorbability of nearly full absorption spectrum could be an effective photocatalyst for decomposition of toxic organic dye from various sources of water.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-024-07488-6