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

• Published in: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2013, Vol.15 (11), p.1, Article 2066
• Main Authors: Bayal, Nisha, Jeevanandam, P.
• Format: Article
• Language: English
• Subjects: Adsorbents; Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Gravimetric analysis; Infrared spectroscopy; Inorganic Chemistry; Lasers; Magnetic properties and materials; Magnetic properties of nanostructures; Materials Science; Nanoparticles; Nanotechnology; Nickel; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Research Paper; Small particles and nanoscale materials; Solid surfaces and solid-solid interfaces; Studies of specific magnetic materials; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); X-ray diffraction
• ISSN: 1388-0764; 1572-896X
• DOI: 10.1007/s11051-013-2066-7

SiO 2 @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 SiO 2 @NiO core–shell nanoparticles show higher remanent magnetization, saturation magnetization, and lower coercivity compared to pure NiO nanoparticles. The SiO 2 @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 SiO 2 .