Bottom-up construction of reduced-graphene-oxide-anchored spinel magnet Fe2.02Ni1.01O3.22, anatase TiO2and metallic Ag nanoparticles and their synergy in photocatalytic water reduction - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Journal of Environmental Chemical Engineering Année : 2021

Bottom-up construction of reduced-graphene-oxide-anchored spinel magnet Fe2.02Ni1.01O3.22, anatase TiO2and metallic Ag nanoparticles and their synergy in photocatalytic water reduction

Résumé

Paramagnet spinel NiFe2O4 nanocrystals were synthesized using the hydrothermal route and were put in contact with anatase TiO2 PC500; the mixture of semi-conductors was employed as substrate to deposit reduced Graphene Oxide (rGO) sheets synthetised via Hummers modified method. Several rGO mass amounts 'x' were deposited (x = 0, 5, 10, 15% and 20%). These steps of synthesis were followed by surface decoration with Ag metallic particles using the photodeposition method, which led to different heterojunction nanocomposite materials. The XRD analysis proved that the NiFe2O4 has a spinel crystalline structure and the anatase TiO2 has a tetragonal system; these crystalline systems were conserved after the deposition of rGO. The electronic properties were studied experimentally using the UV-Vis DRS illustrating a hierarchical gap for the spinel NiFe2O4 and an indirect gap for TiO2; these analyses revealed that the electronic and structural properties are affected when the rGO is deposited. The SEM images proved the formation of the heterojunction and the good mixing of NiFe2O4 and TiO2 with the rGO. The EDX allowed attributing a chemical formula for the spinel structure, Fe2.02Ni1.01O3.22. Furthermore, the photocatalytic properties are influenced by the specific area of the photocatalyst; for that the DLS analysis was carried out to estimate the average aggregated grain seize. At the end, the composites were evaluated for their enhanced adsorptive performance and photocatalytic activity under visible light irradiation to degrade Methylene Blue (MB). In addition, the deposit of metallic Ag showed great improvement in the photocatalytic performances over pristine composites.

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Dates et versions

hal-03196118 , version 1 (21-04-2021)

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R. Bourzami, M.K. Guediri, D. Chebli, A. Bouguettoucha, Abdeltif Amrane. Bottom-up construction of reduced-graphene-oxide-anchored spinel magnet Fe2.02Ni1.01O3.22, anatase TiO2and metallic Ag nanoparticles and their synergy in photocatalytic water reduction. Journal of Environmental Chemical Engineering, 2021, 9 (4), pp.105307. ⟨10.1016/j.jece.2021.105307⟩. ⟨hal-03196118⟩
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