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Rose Bengal Anchored Silica-Magnetite Nanocomposite as Photosensitizer for Visible- Light-Mediated Oxidation of Thioethers

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Abstract

Visible-light-mediated photocatalysis along with magnetic recycling of the catalyst are well accepted as sustainable and environmentally benign pathway for green synthesis. Herein we report a covalently bonded rose bengal with amine functionalized silica-magnetite nanocomposites as a magnetically recyclable photocatalyst, which act as a photosensitizer when illuminated with green LED of wavelength 520 nm. Initially, iron oxide nanoparticles were synthesized, and it was coated with amine functionalized silica via ultrasound assisted method. Subsequently, rose bengal was covalently linked to the amine functionalized silica-magnetite nanocomposites. The size and morphology of the catalyst material was investigated using HRTEM analysis and it was observed that a spherical shaped silica-magnetite nanocomposites of size around 150 nm with monodispersed particles were formed. Further, the coating of silica, linkage of rose bengal and the magnetic property of the nanocomposite were confirmed using XRD, VSM, FTIR and TGA techniques. The catalytic efficacy of RB@NH2-SiO2-Fe3O4 was employed for the oxidation of a series of thioethers under visible light irradiation. This catalyst competently oxidized a variety of thioethers under ambient condition with excellent yield and it was successfully recycled for seven times without any significant loss in the activity.

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Acknowledgements

We thank for utilizing the equipment and instruments rendered by Science and Engineering Research Board, DST, India (EEQ/2017/000374). We acknowledge HRTEM and XRD facility at SRMIST set up with support from MNRE (Project No. 31/03/2014-15/PVSE-R&D), GoI. Analytical facilities rendered from IIT Guwahati, VIT Vellore, ACIC Trichy are gratefully acknowledged

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  1. Department of Chemistry, Guru Nanak College (Affiliated to University of Madras), Velachery, Chennai, Tamil Nadu, 600042, India

    Edwin Prathibha, Rajmohan Rangasamy, Arunasalam Sridhar & Kannappan Lakshmi

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  1. Edwin Prathibha
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Prathibha, E., Rangasamy, R., Sridhar, A. et al. Rose Bengal Anchored Silica-Magnetite Nanocomposite as Photosensitizer for Visible- Light-Mediated Oxidation of Thioethers. J Clust Sci 34, 1605–1614 (2023). https://doi.org/10.1007/s10876-022-02338-y

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