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Synthesis of TiO2@α-Fe2O3 core-shell heteronanostructures by thermal decomposition approach and their application towards sunlight driven photodegradation of Rhodamine B

Abstract

TiO2@α-Fe2O3 core-shell heteronanostructures with different shell thickness have been synthesized by a thermal decomposition approach. The thickness of shell (α-Fe2O3) could be controlled by simply varying amount of the iron-urea complex, which was used as precursor for iron oxide. The formation of core-shell TiO2@α-Fe2O3 was confirmed by various analytical techniques. XRD analysis confirms the presence of anatase and hematite in the TiO2@α-Fe2O3 core-shell heteronanostructures. Scanning electron microscopy studies confirm deposition of α-Fe2O3 shell on the surface of TiO2 spheres and TEM analysis proves formation of uniform α-Fe2O3 shell on the TiO2 spheres. XPS measurements prove the presence of Ti4+, Fe3+, and oxygen in the lattice and surface hydroxyls. From UV-visible DRS spectroscopy, it was observed that the TiO2@α-Fe2O3 core-shell heteronanostructures absorb in both UV and visible range of the electromagnetic spectrum. Field dependent (M-H) magnetic measurements indicate weak ferromagnetic behaviour of TiO2@α-Fe2O3 core-shell nanoparticles at 300 K and superparamagnetic behaviour at 5 K. Temperature dependent magnetic studies (M-T) show characteristic Morin transition of α-Fe2O3 in all the core-shell nanoparticles. The synthesized TiO2@α-Fe2O3 core-shell heteronanostructures were explored as catalyst for photodegradation of rhodamine B (RhB) in an aqueous solution in the presence of sunlight and it was found that TiO2@α-Fe2O3 core-shell nanoparticles act as better photocatalyst compared to pure TiO2 and α-Fe2O3. Kinetic studies indicate that the photodegradation follows first order kinetics.

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Publication details

The article was received on 11 Dec 2017, accepted on 05 Jan 2018 and first published on 08 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ04892K
Citation: New J. Chem., 2018, Accepted Manuscript
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    Synthesis of TiO2@α-Fe2O3 core-shell heteronanostructures by thermal decomposition approach and their application towards sunlight driven photodegradation of Rhodamine B

    J. MAHAJAN and J. Pethaiyan, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04892K

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