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Tsuzuki, Takuya
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Publications (7/7 displayed)
- 2022Paper-Like Writable Nanoparticle Network Sheets for Mask-Less MOF Patterningcitations
- 2020Janus conductive/insulating microporous ion-sieving membranes for stable Li-S batteriescitations
- 2019Reduction kinetics for large spherical 2:1 iron–manganese oxide redox materials for thermochemical energy storagecitations
- 2019Metal-Organic Frameworks/Conducting Polymer Hydrogel Integrated Three-Dimensional Free-Standing Monoliths as Ultrahigh Loading Li-S Battery Electrodescitations
- 2018NiO–ZnO Nanoheterojunction Networks for Room-Temperature Volatile Organic Compounds Sensingcitations
- 2017Removal of lead from aqueous solution using superparamagnetic palygorskite nanocompositecitations
- 2013Immobilization of β-glucosidase on a magnetic nanoparticle improves thermostabilitycitations
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article
Removal of lead from aqueous solution using superparamagnetic palygorskite nanocomposite
Abstract
<p>A palygorskite-iron oxide nanocomposite (Pal-IO) was synthesized in situ by embedding magnetite into the palygorskite structure through co-precipitation method. The physico-chemical characteristics of Pal-IO and their pristine components were examined through various spectroscopic and micro-analytical techniques. Batch adsorption experiments were conducted to evaluate the performance of Pal-IO in removing Pb(II) from aqueous solution. The surface morphology, magnetic recyclability and adsorption efficiency of regenerated Pal-IO using desorbing agents HCl (Pal-IO-HCl) and ethylenediaminetetraacetic acid disodium salt (EDTA-Na<sub>2</sub>) (Pal-IO-EDTA) were compared. The nanocomposite showed a superparamagnetic property (magnetic susceptibility: 20.2 emu g<sup>−1</sup>) with higher specific surface area (99.8 m<sup>2</sup> g<sup>−1</sup>) than the pristine palygorskite (49.4 m<sup>2</sup> g<sup>−1</sup>) and iron oxide (72.6 m<sup>2</sup> g<sup>−1</sup>). Pal-IO showed a maximum Pb(II) adsorption capacity of 26.6 mg g<sup>−1</sup> (experimental condition: 5 g L<sup>−1</sup> adsorbent loading, 150 agitations min<sup>−1</sup>, initial Pb(II) concentration from 20 to 500 mg L<sup>−1</sup>, at 25 °C) with easy separation of the spent adsorbent. The adsorption data best fitted to the Langmuir isotherm model (R<sup>2</sup> = 0.9995) and pseudo-second order kinetic model (R<sup>2</sup> = 0.9945). Pb(II) desorption using EDTA as the complexing agent produced no disaggregation of Pal-IO crystal bundles, and was able to preserve the composite's magnetic recyclability. Pal-IO-EDTA exhibited almost 64% removal capacity after three cycles of regeneration and preserved the nanocomposite's structural integrity and magnetic properties (15.6 emu g<sup>−1</sup>). The nanocomposite holds advantages as a sustainable material (easily separable and recyclable) for potential application in purifying heavy metal contaminated wastewaters.</p>