Superparamagnetic Iron Oxide Nanoparticle Nanodevices Based on Fe₃O₄ Coated by Megluminic Ligands for the Adsorption of Metal Anions from Water

Abstract

The uptake ability toward arsenic(V), chromium(VI), and boron(III) ions of ad hoc functionalized magnetic nanostructured devices has been investigated. To this purpose, ligands based on meglumine have been synthesized and used to coat magnetite nanoparticles (Fe 3 O 4 ) obtained by the co-precipitation methodology. The as-prepared hybrid material was characterized by infrared spectroscopy (IR), X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy combined with energy-dispersive X-ray analysis. Moreover, its magnetic hysteresis properties were measured to evaluate its magnetic properties, and the adsorption kinetics and isothermal models were applied to discern between the different adsorption phenomena. Specifically, the better fitting was observed by the Langmuir isotherm model for all metal ions tested, highlighting a higher uptake in arsenic (28.2 mg/g), chromium (12.3 mg/g), and boron (23.7 mg/g) sorption values if compared with other magnetic nanostructured materials. After adsorption, an external magnetic stimulus can be used to efficiently remove nanomaterials from the water. Finally the nanomaterial can be reused up to five cycles and regenerated for another three cycles.

Chain-Breaking Antioxidant and Peroxyl Radical Trapping Activity of Phenol-Coated Magnetic Iron Oxide Nanoparticles

“…The solution was stirred for 30 min at 70 °C, and the obtained nanoparticles were filtered using a Buchner funnel and washed several times with distilled water to remove ionic species. The synthesized nanomaterials were characterized by infrared spectroscopy (IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the results obtained were in agreement with those reported in our recent work [ 28 ].…”

“…Functionalization was confirmed by FT-IR spectroscopy, as shown in Figure 1 , in which the IR spectra related to the particles coated with gallic acid (GA), Trolox (TX) and nordihydroguaiaretic acid (NDGA) are displayed and compared with the uncoated Fe 3 O 4 nanoparticles. The peaks of 580 cm −1 and 1100 cm −1 in bare magnetite nanoparticles were assigned to Fe-O and Fe-OH bond stretching motion, respectively [ 28 ]. When comparing MAG with the functionalized system, a series of signals related to the organic coating can be observed.…”

“…Phenol-coated magnetite nanoparticles were prepared by surface functionalization approach [ 28 ]. The as-synthetized SPION (1 g) were suspended in 10 mL of a freshly prepared water concentrated solution containing the ligand (10% w / w ).…”

Optimization of iron oxide nanoparticles for MRI-guided magnetic hyperthermia tumor therapy: reassessing the role of shape in their magnetocaloric effect

“…These results demonstrated a successful in vitro MHT treatment on cancer cells, in agreement with previously reported results using 14 nm core size NPs and BV-2 cells, although these results were obtained by applying higher frequencies (>550 kHz), suggesting a better performance of our NPs. 42…”

A Cu(ii) complex supported on Fe3O4@SiO2 as a magnetic heterogeneous catalyst for the reduction of environmental pollutants

“…1b shows the XRD patterns of CM@SS-BBTU and CM@SS-BBTU-Cu( ii ). The peaks at 2 θ = 30.1°, 35.4°, 43.1°, 53.5°, 57.9° and 63.0° correspond to the (220), (311), (400), (422), (511), and (440) planes of the cubic Fe 3 O 4 (JCPDS 19-0629), respectively, 118 in CM@SS-BBTU structure, confirming the formation of multi-functional magnetic catalyst. The same characteristic peak can also be observed in the XRD pattern of CM@SS-BBTU-Cu( ii ) with the same crystallinity, suggesting that the formation of the copper complex has no effect on the properties of CM@SS.…”