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- Title
Iron Oxide Nanoparticles Supported on Mesoporous MCM-41 for Efficient Adsorption of Hazardous β-Lactamic Antibiotics.
- Authors
Salviano, Adriana Barbosa; Santos, Mariana Rocha Dutra; de Araújo, Laura Maia; Ardisson, Jose Domingos; Lago, Rochel Montero; Araujo, Maria Helena
- Abstract
In this work, the effect of crystallite size, defects, and surface area of iron oxyhydroxide particles supported on mesoporous MCM-41 on the adsorption of hazardous β-lactamic antibiotics was investigated. Different adsorbents were prepared by impregnation of 5, 10, 20, and 50 wt% of Fe followed by treatment at 150-400 °C. Mössbauer, XRD, BET, TG, FTIR, and Raman analyses suggested that treatment at 150 °C produced a mixture of α-Fe2O3, FeOOH, and highly dispersed Fe3+ species. At higher temperatures, different phases were gradually converted to hematite with crystallite sizes varying from 1 to 5 nm. Both, Fe content and temperature, strongly affected the amoxicillin, cephalexin, and ceftriaxone adsorption at pH 5, 7, and 9, with the best results obtained for the sample 20Fe150 (20% Fe treated at 150 °C), ca. 25 mgAMX g−1 which decreased to 17, 6, and 4 mgAMX g−1 (AMX = amoxicillin) upon treatment at higher temperatures. These results combined with competitive adsorption using AMX/phosphate and H2O2 decomposition experiments suggested that the antibiotic molecules are likely adsorbing by complexation on Fe3+ surface species of poorly crystallized small particles of Fe oxyhydroxide phases. It was observed that below a critical crystallite size of 3 nm, the AMX adsorption was very sensitive and strongly increased.
- Subjects
IRON oxide nanoparticles; MESOPOROUS materials; FOURIER transform infrared spectroscopy; HEMATITE; AMOXICILLIN; CEFTRIAXONE
- Publication
Water, Air & Soil Pollution, 2018, Vol 229, Issue 3, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-017-3652-6