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Structure-led manifestation of photocatalytic activity in magnetically recoverable spinel CuFe 2 O 4 nanoparticles and its application in degradation of industrial effluent dyes under solar light.
Nanotechnology 2024 April 10
An efficient removal of the photocatalysts used in the decontamination of water is crucial after its application beside its expected visible light sensitive activities. This study presents the synthesis of magnetically separable CuFe2 O4 nanoparticles (CFNPs) with enhanced photoactivity under AM 1.5G sunlight. A simple two-step process involving co-precipitation and hydrothermal treatment is employed, with subsequent annealing at temperatures from 200 °C to 1000 °C to synthesize the CFNPs. The characteristic features of the highest photoactive tetragonal phase of CFNP are confirmed by powder XRD studies with Rietveld refinement. This scheme strategically controls the growth of a highly photoactive tetragonal phase with predominant (224) facets over other less active facets in cubic CuFe2 O4 . Mott-Schottky analysis confirms the p-type semiconducting nature of CFNPs. A favourable direct optical band gap of 1.73 eV as well as photoluminescence emission quenching for visible photons show that the (224) oriented CFNPs are good photocatalysts in the visible spectrum with demonstrated organic dye degradations, including methylene blue and others. A density functional theory-based approach validates that the adsorption of such dye is thermodynamically more favourable on (224) facets of CuFe2 O4 to facilitate the redox action by the excitons.
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