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- Title
Surface restructuring of red mud to produce FeO<sub><italic>x</italic></sub>(OH)<sub><italic>y</italic></sub> sites and mesopores for the efficient complexation/adsorption of β-lactam antibiotics.
- Authors
Pinto, Paula S.; Lanza, Giovani D.; Souza, Mayra N.; Ardisson, José D.; Lago, Rochel M.
- Abstract
In this work, iron oxide in the red mud (RM) waste was restructured to produce mesopores with surface [FeO<italic>x</italic>(OH)<italic>y</italic>] 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 (<italic>R</italic>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<italic>x</italic>(OH)<italic>y</italic>] species by a complexation process. Moreover, the OH/Fe ratio, BET surface area and porosity indicated that this complexation is occurring especially on [FeO<italic>x</italic>(OH)<italic>y</italic>]surf sites contained in the mesopore space.
- Subjects
WATER purification; DENITRIFICATION; IRON oxides; BETA lactam antibiotics; HEMATITE
- Publication
Environmental Science & Pollution Research, 2018, Vol 25, Issue 7, p6762
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-017-1005-z