A magnetic nanomaterial modified with poly-lysine for efficient removal of anionic dyes from water

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2015-02, Vol.262, p.313-318
• Main Authors: Zhang, Yan-Ru, Su, Peng, Huang, Jun, Wang, Qing-Rong, Zhao, Bao-Xiang
• Format: Article
• Language: English
• Subjects: Adsorption; Anionic dyes; Contact; Diffraction; Dyes; Magnetic nanoparticles; Nanoparticles; Nanostructure; Poly-lysine; Thermogravimetric analysis; X-rays
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2014.09.094

[Display omitted] •The adsorbent can be conveniently separated and effectively reused.•The surface containing lots of amino groups can enhance the adsorption capacities for anionic dyes.•Low toxic organosilane and poly-lysine were used as raw materials. This work describes the synthesis and adsorption behavior of Fe3O4 magnetic nanoparticles (MNPs) modified with 3-glycidoxypropyltrimethoxysilane (GPTMS) and poly-lysine (P-Lys). The magnetic nanoparticles were characterized by infra-red spectra, transmission electron microscopy, X-ray diffraction, thermogravimetric analysis and X-ray photoelectron spectroscopy. To understand the adsorption mechanism of the MNPs, we investigated anionic dye uptake capacity of Fe3O4@GPTMS@P-Lys as a function of contact time, dye concentration and pH. The MNPs could effectively remove anionic dyes including methyl blue (MB), orange I (OR-I), amaranth (AM) and acid red 18 (AR-18) from water solution. Furthermore, the improved adsorbent showed convenient separation and efficient reusability, and enhanced the adsorption capacity for anionic dyes.