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Issue 4, 2018
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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

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Abstract

TiO2@α-Fe2O3 core–shell heteronanostructures with different shell thickness have been synthesized by a thermal decomposition approach. The thickness of the shell (α-Fe2O3) could be controlled by simply varying the amount of iron–urea complex, which was used as a 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 the α-Fe2O3 shell on the surface of TiO2 spheres and TEM analysis proves the formation of a uniform α-Fe2O3 shell on the TiO2 spheres. The 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 the UV and visible range of the electromagnetic spectrum. Field-dependent (MH) magnetic measurements indicate the weak ferromagnetic behaviour of the TiO2@α-Fe2O3 core–shell nanoparticles at 300 K and superparamagnetic behaviour at 5 K. Temperature-dependent magnetic studies (MT) show the characteristic Morin transition of α-Fe2O3 in all the core–shell nanoparticles. The synthesized TiO2@α-Fe2O3 core–shell heteronanostructures were explored as a catalyst for the 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 a better photocatalyst compared to pure TiO2 and α-Fe2O3. Kinetic studies indicate that the photodegradation follows first-order kinetics.

Graphical abstract: Synthesis of TiO2@α-Fe2O3 core–shell heteronanostructures by thermal decomposition approach and their application towards sunlight-driven photodegradation of rhodamine B

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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., 2018,42, 2616-2626
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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 P. Jeevanandam, New J. Chem., 2018, 42, 2616
    DOI: 10.1039/C7NJ04892K

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