Synergistic effect of fuel agents and mass ratio for morpho-structural optimization of magnetic claybased nanocomposites with high adsorption capacity

Stefana Cojocaru1, Adrian Iulian Borhan2,3, Alexandra Raluca Iordan2, Mircea Nicolae Palamaru2, Simona Cucu-Man2, Vasile Hulea4, Nicoleta Melniciuc-Puica5, Ioan Dumitru6, Tiberiu Roman2,7, Iuliana Gabriela Breaban1

1 Alexandru Ioan Cuza University of Iasi, Faculty of Geography and Geology,20A Carol I Blvd., 700505, Iasi, Romania
2 Alexandru Ioan Cuza University of Iasi, Faculty of Chemistry,11Carol I Blvd., 700506, Iasi, Romania
3 National Institute of Research and Development for Technical Physics,47 Mangeron Blvd., Iasi 700050, Romania
4 Charles Gerhardt Institute, Montpellier, UMR 5253, CNRS-UM2-ENSCM-UM1, Mat riaux Avanc s pour la Catalyse et la Sant , 8 rue de l Ecole Normale,34296 Montpellier Cedex 5, France
5 Alexandru Ioan Cuza University of Iasi, Faculty of Orthodox Theology,9 Closca str., 700065, Iasi, Romania
6 Alexandru Ioan Cuza University of Iasi, Faculty of Physics, 11Carol I Blvd., 700506, Iasi, Romania
7 Gheorghe Asachi Technical University of Iasi, Faculty of Materials Science and Engineering, 61A Mangeron Blvd., 700050 Iasi, Romania

Abstract


The study is focused on creating magnetic mesoporous materials through the insertion of a nickel ferrite into the structure of kaolin-type clay. Sol-gel auto-combustion method was employed to synthesize the materials, using glycine and tartaric acid as chelating/combustion agents. This is the first study on the combined effect of different fuel agents and of clay-to-ferrite molar ratio on the structural, textural, magnetic and adsorptive properties of nanocomposites. The value of the average pore size, registered in a range of 6.01 and 12.9 nm, indicates the dependence on both molar ratio and fuel agent. The textural properties of the materials, corroborated with those obtained from XRD, SEM and TEM and VSM, suggest that magnetic nanocomposites can be successfully used as adsorbents in the removal of harmful organics. The obtained nanocomposites show excellent adsorption, with up to 98% BB41 dye removal, and a facile recuperation, due to their magnetic properties. The maximum adsorption capacity of dye, of 752.2 mg/g, was obtained for C3Ni_act350, in the presence of H2O2 in solution. More than that, the adsorption capacity of magnetic composites increased with increasing the NiFe2O4 content.

Keywords


adsorption; composite nanomaterials; dye; kaolin; magnetic separation; Ni ferrite

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