The Magnetic Properties and Dye Adsorption of Sericin-modified Magnetite Nanoparticles
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ORIGINAL PAPER
The Magnetic Properties and Dye Adsorption of Sericin‑modified Magnetite Nanoparticles Kwandee Chamchoy1 · Thitirat Inprasit1 · Chutima Vanichvattanadecha2 · Apichya Thiangtrong2 · Patsaya Anukunwithaya2 · Penwisa Pisitsak1 Accepted: 14 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The use of ferromagnetic nanoparticles as an adsorbent in water treatment has one distinct benefit: they can be removed simply by applying an external magnetic field. In this work, sericin-coated magnetite nanoparticles (SC-MNPs) were synthesized from ferric salts ( Fe3+), ferrous salts (Fe2+), and sericin in alkaline solution at room temperature. The sericin, a waste protein produced during silk degumming, was demonstrated to control the size and morphology of the magnetite nanoparticles. Transmission electron microscopy clearly showed the presence of a sericin coating, and the particle size decreased from 16 ± 5 nm for the untreated MNPs to 12 ± 4 nm for the sericin-coated MNPs. FT-IR spectroscopy also confirmed the presence of sericin on the nanoparticles. The SC-MNPs were approximately 40% more effective than the unmodified MNPs in adsorption of methylene blue (a cationic dye) from water. Adsorption equilibrium was reached within 120 min. A good fit was found between the empirical adsorption data and the Freundlich isotherm, suggesting that adsorption was physical in nature, and that multiple layers were formed. Keywords Adsorption · Magnetic properties · Magnetite · Methylene blue · Nanoparticle · Sericin
Introduction Effluents from industrial dyeing, printing, and related processes usually contain colored compounds. These are esthetically unpleasant and may be harmful to the ecosystem. Wastewater carrying a large burden of organic dye has high chromaticity, high organic matter concentration, is poorly biodegradable, and prevents photosynthesis by microorganisms [1, 2]. To protect the environment, statutory guidelines mandate that wastewater be treated prior to discharge. A range of physical, chemical, and biological methods have been used to treat dyed-contaminated water. The most widely studied methods include flocculation [3, * Penwisa Pisitsak [email protected] 1
Department of Materials and Textile Technology, Faculty of Science and Technology, Thammasat University, Pathum Thani 12120, Thailand
Development Agency (NSTDA), Nano Functional Textile Laboratory (NFT), National Nanotechnology Center (NANOTEC), National Science and Technology, Pathum Thani 12120, Thailand
2
4], membrane filtration [5], advanced oxidation [6], ozonation [7], photocatalytic degradation [8], and biodegradation [9, 10]. Adsorption is effective in removing organic compounds, which are normally resistant to biological degradation or oxidation. Other advantages of adsorption include low operating costs and ease of design. Adsorption is widely employed for treatment of wastewater from dyeing and printing processes [11]. Over the last decades, magnetite nanoparticles (MNPs) have bee
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