Preparation and graft modification of hierarchically porous ferriferrous oxide for heavy metal ions adsorption
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ORIGINAL PAPER: NANO- AND MACROPOROUS MATERIALS (AEROGELS, X E R O G E L S , CR Y O G E L S , E T C. )
Preparation and graft modification of hierarchically porous ferriferrous oxide for heavy metal ions adsorption Fan Wang1 Yukun Sun1 Xingzhong Guo1,2 Dongyun Li3 Hui Yang1,2 ●
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Abstract Hierarchically porous ferriferrous oxide (Fe3O4) was facilely synthesized via a sol-gel process accompanied by phase separation, and further graft modified by dopamine (DA) and polyamido-amine (PAMAM) to prepare macroporous Fe3O4@DA@PAMAM for heavy metal ions adsorption. Appropriate phase separation inducer (poly(acrylamide), PAA) and solvent allows the formation of iron oxide xerogels with interconnected macropores and cocontinuous skeletons. Two-step heat treatment at 200 °C for 30 min in air and then at 500 °C for 2 h in N2 atmosphere leads to the precipitation of crystalline phase, Fe3O4, with high magnetic properties, without any deterioration of the macrostructure. The macroporous Fe3O4@DA@PAMAM show a core-shell structure and high adsorption capacity for Cu(II), Pb(II), and Cd(II) ions, which are promisingly used for removal of heavy metal ions. Graphical Abstract The sol-gel process accompanied by phase separation and two-step heat treatment allow the synthesis of hierarchically porous ferriferrous oxide (Fe3O4) with high magnetic properties. Further graft modification by dopamine (DA) and polyamido-amine (PAMAM) leads to prepare macroporous Fe3O4@DA@PAMAM for heavy metal ions adsorption.
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Received: 26 April 2020 / Accepted: 17 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
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Keywords
Sol-gel Ferriferrous oxide Hierarchically porous structure Heavy metal ions adsorption ●
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* Xingzhong Guo [email protected]
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Research Institute of Zhejiang University-Taizhou, 318000 Taizhou, China
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College of Materials Science and Engineering China Jiliang University, 310018 Hangzhou, China
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, 310027 Hangzhou, China
Journal of Sol-Gel Science and Technology
Highlights ● Hierarchically porous Fe3O4 was synthesized via a sol-gel accompanied by phase separation, followed by two-step heat treatment. ● Macroporous Fe3O4@DA@PAMAM can be obtained by graft modification of dopamine (DA) and polyamido-amine (PAMAM). ● Benefiting from the core-shell structure and macrostructure, the Fe3O4@DA@PAMAM possesses excellent adsorption capability.
1 Introduction Magnetic nanomaterials are widely used in many fields, such as heavy metal adsorption, chemical, and biochemical magnetic separation, magnetic drug directional release and optical detection, due to their high specific surface area, controllable pore size, high biocompatibility, es
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