One-step Sustainable Preparation of Superparamagnetic Iron Oxide Nanoparticles Supported on Mesoporous SiO2

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Chamorro, Elena and Tenorio, M. José and Calvo Garrido, Lourdes and Torralvo Fernández, María José and Sáez Puche, Regino and Cabañas Poveda, Albertina (2020) One-step Sustainable Preparation of Superparamagnetic Iron Oxide Nanoparticles Supported on Mesoporous SiO2. Journal of Supercritical Fluids, 159 . ISSN 0896-8446

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Official URL: https://doi.org/10.1016/j.supflu.2020.104775



Abstract

Superparamagnetic iron oxide nanoparticles (SPIONs) supported on high surface area mesoporous SiO2 are advanced materials of great interest in catalysis, adsorption and biomedicine. Here we present a new process to prepare SPION/SiO2 materials by the impregnation and insitu decomposition of Fe(NO3)3.9H2O on mesoporous SiO2 supports in a 25-50% mol ethanol + CO2 mixture at 523 K and 25.0 MPa. -Fe2O3 nanoparticles (NPs) of average size between 6-9 nm were distributed homogeneously on the supports. NPs deposited into the SBA-15 mesopores but mostly on the external surface of MCM-41. Materials prepared with the highest ethanol content were very homogeneous. Magnetic measurements confirmed the superparamagnetic nature of the materials at room temperature. The process proposed is sustainable and scalable, avoids tedious preparations and the additional high temperature treatment under a controlled atmosphere, as the metal decomposition is performed insitu in the CO2-expanded liquid mixture.


Item Type:Article
Uncontrolled Keywords:SPION, Supercritical CO2, Maghemite, Mesoporous Materials, CO2-expanded liquids.
Subjects:Sciences > Chemistry > Chemistry, Physical and theoretical
Sciences > Chemistry > Chemistry, Inorganic
ID Code:61538
Deposited On:16 Jul 2020 09:00
Last Modified:01 Jun 2021 22:00

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