A novel tin ferrite/polymer composite use in photo-Fenton reactions
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ORIGINAL PAPER
A novel tin ferrite/polymer composite use in photo‑Fenton reactions J. Leichtweis1 · S. Silvestri1 · Y. Vieira2 · T. A. de Lima Burgo2 · E. L. Foletto1 Received: 16 May 2020 / Revised: 6 August 2020 / Accepted: 14 September 2020 © Islamic Azad University (IAU) 2020
Abstract Novel SnFe2O4/polypyrrole composite photo-Fenton catalysts were prepared and characterized by XRD, SEM, EDS, UV–Vis, BET, AFM, and XPS. The effect of different proportions of ferrite and polymer in the composite was investigated on the degradation efficiency of tartrazine dye in terms of pH and H2O2 dosage. A response surface methodology was applied to determine the best conditions of the reactor. The 10 wt% SnFe2O4 composites presented higher activity being able to discolor 100% of the tartrazine dye solution (100 mL, 20 mg L−1) by photo-Fenton process in 60 min under the following conditions: 0.1 g of SFO-10-PPy, pH 3, 3.4 × 10−5 mol L−1 of H2O2, and visible radiation. This enhanced performance is associated with a decrease in the bandgap energy and electron–hole recombination rate, which was efficient in a charge carrier transport. In this way, it enables the generation of radicals ·OH and O·− 2 , by which it was possible to elucidate a possible mechanism for degradation. In addition, the composite can be used for eight recycles with high physicochemical stability. In general, due to the fact that the composite presented intrinsic properties, high catalytic activity, simple preparation, and good reuse, the supported catalyst showed potential to become a highly efficient and environmentally friendly catalyst for the treatment of wastewater containing organic pollutants. Graphic abstract
Keywords SnFe2O4 · Polypyrrole · Composite · Reactor operation parameters · Photo-Fenton process · Tartrazine dye Editorial responsibility: Samareh Mirkia. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13762-020-02944-1) contains supplementary material, which is available to authorized users. * S. Silvestri [email protected] Extended author information available on the last page of the article
Introduction A major highlight of advanced oxidation processes (AOPs) is the photo-Fenton reaction, which is based on the generation of hydroxyl radicals (·OH) by the simultaneous combination of H 2O2, Fe2+ ions, acid pH, and irradiation
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International Journal of Environmental Science and Technology
source in the visible region (Possetto et al. 2018; Katsumata et al. 2004). Among the most commonly used semiconductor oxides, the ferrites are being widely investigated for the photodecomposition of organic and toxic pollutants in wastewater (Samakchi et al. 2018; Zhu et al. 2018). Among the ferrites, the SnFe2O4 (SFO) stands out as a potential catalyst due to its narrow bandgap and high stability (Cai et al. 2016). However, studies report high recombination rates that may occur between the electron/hole (ē/h+) pairs formed after the activation by radiation wh
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