Iron Oxide Nanoparticles Supported on Mesoporous MCM-41 for Efficient Adsorption of Hazardous β-Lactamic Antibiotics
| Autor: | Adriana Barbosa Salviano, José D. Ardisson, Rochel Montero Lago, Maria Helena Araujo, Mariana Rocha Dutra Santos, Laura Maia De Araújo |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Chemistry Ecological Modeling 02 engineering and technology 010501 environmental sciences Hematite 021001 nanoscience & nanotechnology 01 natural sciences Pollution Decomposition chemistry.chemical_compound Adsorption MCM-41 visual_art Mössbauer spectroscopy visual_art.visual_art_medium Environmental Chemistry Crystallite 0210 nano-technology Mesoporous material Iron oxide nanoparticles 0105 earth and related environmental sciences Water Science and Technology Nuclear chemistry |
| Zdroj: | Water, Air, & Soil Pollution. 229 |
| ISSN: | 1573-2932 0049-6979 |
| Popis: | 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. Mossbauer, 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. |
| Databáze: | OpenAIRE |
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