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Synthesis of SiO2@NiO magnetic core–shell nanoparticles and their use as adsorbents for the removal of methylene blue

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Abstract

SiO2@NiO core–shell nanoparticles with variable NiO shell thickness have been prepared via homogeneous precipitation. The as prepared and calcined core–shell nanoparticles have been characterized using powder X-ray diffraction, thermal gravimetric analysis, FT-IR spectroscopy, scanning electron microscopy, transmission electron microscopy, and surface area measurements. The shell thickness and the particle size of NiO in the core–shell nanoparticles have been controlled using different concentrations of the nickel salt. The NiO shell thickness, as observed by the TEM, varies from about 46 to 144 nm. The SiO2@NiO core–shell nanoparticles show higher remanent magnetization, saturation magnetization, and lower coercivity compared to pure NiO nanoparticles. The SiO2@NiO core–shell nanoparticles have been tested as adsorbents for the removal of methylene blue from an aqueous solution and the core–shell nanoparticles possess good adsorption efficiency for the cationic dye compared to pure NiO and SiO2.

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Acknowledgments

The award of research fellowship (JRF/SRF) to Ms. Nisha Bayal by the Council of Scientific and Industrial Research, Government of India is gratefully acknowledged. Thanks are due to the Institute Instrumentation Centre, IIT Roorkee for providing the facilities.

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  1. Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Nisha Bayal & P. Jeevanandam

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  1. Nisha Bayal
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Correspondence to P. Jeevanandam.

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Bayal, N., Jeevanandam, P. Synthesis of SiO2@NiO magnetic core–shell nanoparticles and their use as adsorbents for the removal of methylene blue. J Nanopart Res 15, 2066 (2013). https://doi.org/10.1007/s11051-013-2066-7

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