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Removal of antibiotics from aqueous solution by using magnetic Fe 3 O 4 /red mud-nanoparticles
Ist Teil von
The Science of the total environment, 2019-06, Vol.670, p.539
Ort / Verlag
Netherlands
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Access via ScienceDirect (Elsevier)
Beschreibungen/Notizen
In this study, the availability of magnetically separable Fe
O
-red mud nanoparticles (Fe
O
-RM-NPs) for the removal of antibiotics from wastewater was investigated. Disadvantages of red mud and Fe
O
because of difficult separation from aqueous media, agglomeration, and iron leaching were overcome by combining these two materials. After examinating adsorption capability of magnetic Fe
O
-RM-NPs for all studied antibiotic compounds, the experiments were performed by using Ciprofloxacin (CIPRO) as a model compound. Batch experiments were performed to determine the effect of red mud content of synthesized Fe
O
-RM-NPs, pH, reaction time and temperature on the proposed method. The surface morphology, magnetic properties, crystalline structure, thermal stability and Brunauer-Emmet-Teller surface area of the synthesized Fe
O
-RM-NPs were determined. The saturation magnetization of Fe
O
-RM-NPs was determined to be 12.2 emu/g, which is efficient to separate adsorbent from water by using a conventional magnet. For the efficient removal of CIPRO from aqueous media optimum conditions were determined to be 1.5 g red mud for Fe
O
-RM-NPs synthesize, pH 6.0, reaction time 60 min, 3 g/L Fe
O
-RM-NPs dosage at 25 °C. Adsorption was fitted well with pseudo-second-order kinetic model. Equilibrium data were found to be better represented by Freundlich isotherm. n value was 4.32, and K
value was 110.15 mg/g for Freundlich isotherm. No important matrix effect was determined for removal of CIPRO from wastewater sample. Film diffusion mechanism controlled adsorption. Magnetically separable Fe
O
-RM-NPs are proposed to be used as efficient adsorbent to remove antibiotics from wastewater sources. Since red mud is a process waste, proposed nanomaterial is a good alternative to commercial adsorbents.