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Structural Features, Magnetic Properties and Photocatalytic Activity of Bismuth Ferrite Nanoparticles Grafted on Graphene Nanosheets

Abstract

Graphene based visible light responsive photocatalyst has been actively used. Among various photocatalyst, bismuth ferrite (BiFeO3), with suitable band gap, gained more attention. In this work, BiFeO3 nanoparticles were prepared and grafted on graphene nanosheets (BiFeO3-g-GNS). The morphology, photocatalytic, structural, optical and magnetic properties of BiFeO3-g-GNS were investigated. The XRD analysis shows that crystalline BiFeO3 nanoparticles have a rhombohedral crystal structure with R3c space group. Well decorated graphene nanosheets (GNS) with spherical perovskite type BiFeO3 nanoparticles (50–80 nm) are obtained, as confirmed by FESEM and HRTEM analysis. Raman spectra and XPS spectra confirm the presence of different valence states (Fe+3, Bi+3) and chemical bonding (Fe-O, Bi-O) in BiFeO3. M–H curves (at 10, 297 and 380 K) do not show any hysteresis after the grafting on GNS. Moreover, magnetic domain structure and magnetization behavior of BiFeO3 nanoparticles were discerned from MFM. Presence of GNS reduces the band gap of BiFeO3 to 2.07 eV (BiFeO3-g-GNS) from 2.15 eV (pristine BiFeO3). Improved photoluminescence (PL) characteristics and higher BET surface area have also been observed in case of BiFeO3-g-GNS. The photocatalytic activities of pristine BiFeO3 and BiFeO3-g-GNS were tested by cationic methylene blue (MB) and anionic methyl orange (MO) dyes degradation. It has been observed that BiFeO3-g-GNS exhibit higher photocatalytic activity on MB (87%) and MO (35.9%) than pristine BiFeO3 (57.9 and 4.1% respectively). Hence, the rate of photocatalytic degradation of MB and MO dye is significantly enhanced in case of BiFeO3-g-GNS than pristine BiFeO3. The higher catalytic activity of BiFeO3-g-GNS is attributed to lower band gap, higher absorption in visible region and reduced recombination of photogenerated electron/hole pairs in presence of GNS. Herein, we demonstrate that photocatalytic activity of BiFeO3 nanoparticles can be enhanced by grafting it on GNS without influencing their magnetic and structural properties.

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Publication details

The article was received on 26 Apr 2018, accepted on 11 May 2018 and first published on 14 May 2018


Article type: Paper
DOI: 10.1039/C8NJ02030B
Citation: New J. Chem., 2018, Accepted Manuscript
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    Structural Features, Magnetic Properties and Photocatalytic Activity of Bismuth Ferrite Nanoparticles Grafted on Graphene Nanosheets

    O. P. bajpai, S. Mondal, R. Ananthakrishnan, P. Mandal, D. Khastgir and S. Chattopadhyay, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02030B

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