Mechanosynthesis of magnetically recoverable BiFeO3/Fe3O4 nanocomposite for water treatment applications.

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Abstract
06-054 Eduardo Azzolini Volnistem Volnistem, E.A.(Maringa State University); Bini, R.D.(Universidade Estadual de Maringá); Santos, I.A.(Maringa State University); Cótica, L.F.(Maringa State University); Dias, G.S.(Maringá State University); da Silva, V.S.(Maringá State University); Annually, tons of organic dyes used in the textile industry and their subproducts are discarded into the water bodies around the world. In this sense, the synthesis of photocatalytic materials plays an important role on the degradation of organic pollutants from water, besides energy conversion and other environmental applications.. Bismuth ferrite (BiFeO3) is promising material for such applications and their based materials are being successfully applied for the discoloration of some organic dyes due to their band gap value (~ 2.3 eV) and the fact of their ferroelectric properties promote an efficient electron-hole separation under visible light illumination. BiFeO3 is a multiferroic magnetoelectric material with rhombohedral distorted perovskite structure (ABO3) showing ferroelectric and antiferromagnetic orderings at room temperature. However, the catalyst recoverability requires advanced filtering systems owing to low magnetic response of BiFeO3 based catalysts. However, the synthesis of Bismuth-Iron based materials with high magnetic responses is a challenge and requires complexes chemical synthesis routes rendering the process ineffective in industrial scale. In this investigation, we propose a new synthesis route of BiFeO3/Fe3O4 nanocomposite using High Energy Ball Milling. Also, the composite efficiency on photodegradation of Methylene-Blue and Methyl-Orange used as textile dyes, and their recoverability by magnetic filtering were tested. BiFeO3/Fe3O4 nanocomposites structure, microstructure, magnetic and optical properties were investigated by XRD, SEM, VSM and UV-Vis. Also, the surface potential under photo-stimulation was studied by Photo-assisted Kelvin Force microscopy (P-KFM). The degradation efficiency tests show total removal of MB and 70% of MO from water after 20 minutes under visible light irradiation. In addition, no traces of particles debris were found into the treated water after magnetic filtering for the samples with 40% of Fe3O4.
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