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Surface restructuring of red mud to produce FeO x (OH) y sites and mesopores for the efficient complexation/adsorption of β-lactam antibiotics

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Abstract

In this work, iron oxide in the red mud (RM) waste was restructured to produce mesopores with surface [FeO x (OH) y ] sites for the efficient complexation/adsorption of β-lactam antibiotics. Red mud composed mainly by hematite was restructured by an acid/base process followed by a thermal treatment at 150–450 °C (MRM150, MRM200, MRM300, and MRM450) and fully characterized by Mössbauer, XRD, FTIR, BET, SEM, CHN, and thermogravimetric analyses. The characterization data showed a highly dispersed Fe3+ oxyhydroxy phase, which was thermally dehydrated to a mesoporous α-Fe2O3 with surface areas in the range of 141–206 m2 g−1. These materials showed high efficiencies (21–29 mg g−1) for the adsorption of β-lactam antibiotics, amoxicillin, cephalexin, and ceftriaxone, and the data was better fitted by the Langmuir model isotherm (R 2 = 0.9993) with monolayer adsorption capacity of ca. 39 mg g−1 for amoxicillin. Experiments such as competitive adsorption in the presence of phosphate and H2O2 decomposition suggested that the β-lactamic antibiotics might be interacting with surface [FeO x (OH) y ] species by a complexation process. Moreover, the OH/Fe ratio, BET surface area and porosity indicated that this complexation is occurring especially on [FeO x (OH) y ]surf sites contained in the mesopore space.

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Funding

The authors gratefully acknowledge the financial support of the MIDAS INCT, CNPq, CAPES, FAPEMIG, and UFMG Microscopy Center.

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Correspondence to Rochel M. Lago.

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Responsible editor: Guilherme L. Dotto

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Pinto, P.S., Lanza, G.D., Souza, M.N. et al. Surface restructuring of red mud to produce FeO x (OH) y sites and mesopores for the efficient complexation/adsorption of β-lactam antibiotics. Environ Sci Pollut Res 25, 6762–6771 (2018). https://doi.org/10.1007/s11356-017-1005-z

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  • DOI: https://doi.org/10.1007/s11356-017-1005-z

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