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Title: Design of Polymer-Brush-Grafted Magnetic Nanoparticles for Highly Efficient Water Remediation
Authors: Farrukh, Aleeza
Akram, Attia
Ghaffar, Abdul
Hanif, Sara
Hamid, Almas
Duran, Hatice
Yameen, Basit
Keywords: magnetic nanoparticles
polymer brushes
Issue Date: 2013
Publisher: Amer Chemical Soc
Abstract: Highly efficient removal of mercury(II) ions (Hg-II) from water has been reported by employing polymer-brush-functionalized magnetic nanoparticles (MNPs). Surface-initiated conventional radical polymerization (SI-cRP) was used to grow poly(2-aminoethyl methacrylate hydrochloride) (poly-AEMA center dot HCl) polymer chains on magnetite nanoparticles (Fe3O4), followed by the transformation of pendant amino groups into dithiocarbamate (DTC) groups, which showed high chelating affinity toward Hg-II ions. This polymer-brush-based DTC-functionalized MNP (MNPs-polyAEMA center dot DTC) platform showed the complete removal of Hg-II from aqueous solutions. The Hg-II ion removal capacity and efficiency of MNPs-polyAEMA center dot DTC were compared with its monolayer analogue, which was derived from the direct transformation of amino groups of (3-aminopropyl) triethoxysilane (APTES)-functionalized MNPs (MNPs-APTES) to DTC functional groups (MNPs-DTC). The surface chemical modifications and higher chelating functional group density, in the case of MNPs-polyAEMA center dot DTC, were ascertained by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), physical property measurement system (PPMS), attenuated total reflectance infrared (ATR-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The Hg-II ion removal capacity and efficiency of monolayer and polymer-brush-based DTC-functionalized MNPs (MNPs-DTC and MNPs-polyAEMA center dot DTC, respectively) were evaluated and compared by studying the effect of various factors on the percentage removal of Hg-II such as adsorbent amount, temperature, and contact time. Furthermore, the adsorption behavior of MNPs-DTC and MNPs-polyAEMA center dot DTC was analyzed by applying Langmuir and Freundlich adsorption isotherm models. In addition, the adsorption thermodynamics, as well as the adsorption kinetics, were also evaluated in detail. The higher surface functional group density of MNPs-polyAEMA center dot DTC led to superior remediation characteristics toward Hg-II ions than its monolayer analogue.
ISSN: 1944-8244
Appears in Collections:Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü / Department of Material Science & Nanotechnology Engineering
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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