Facile Synthesis Strategy to Create Mesoporous Magnetic Iron Oxides Using Pectin‑Based Precursors

Abstract

Magnetic iron oxides are of great scientific and technological relevance. Therefore, herein, we report the research on developing methodologies for their sustainable and reproducible preparation. We discuss the synthesis of iron oxides involving citrus pectin as a source of energy (42 MJ kg-1) to promote the formation of the magnetic phases. The method involved two simple steps: gelation of the pectin (80 °C, 4 h) with iron nitrate nonahydrate [Fe(NO 3) 3 .9H 2 O], and calcination (600 °C, 1 h). X-ray diffraction indicated the major formation of hematite (α-Fe 2 O 3) and ferrite phases. Microscopy images show materials with an average size below 50 nm. Textural properties indicated pore sizes of 7-30 nm while magnetic measurements indicated the formation of soft and hard oxides (coercivity between 90 and 400 Oe) and high magnetization saturation (50 emu g-1).

Microwave Hydrothermal Synthesis of Mesoporous First-Row Transition Metal Ferrites

“…Earth-abundant iron oxide is well known as a promising material for both fundamental scientific interests and technological applications of industrial and environmental significance in the last few decades. − Iron oxide has a series of attractive properties, including its abundance, nontoxic nature, and remarkable stability in an aqueous environment . Iron oxides also have unique biochemical, magnetic, and catalytic activities that provide suitability for specific technical and biomedical applications. , Ferrites are of particular interest due to their demonstrated role in biomedical and magnetic devices, rechargeable batteries, sensors, catalysis, and water treatment. , …”

“…7,8 Ferrites are of particular interest due to their demonstrated role in biomedical and magnetic devices, rechargeable batteries, sensors, catalysis, and water treatment. 9,10 The structure of ferrites is a cubic spinel structure. 25 Typically, there are three types of spinels, namely, normal spinel, inverse spinel, and mixed spinel.…”

Recycling diaper waste for the fabrication of flexible supercapacitors and the role of lead ferrite (PbFe11CrO19) in enhancing their capacitance

“…22 The XRD pattern also revealed traces of α-Fe 2 O 3 , and this subproduct was formed during the synthesis and its orientations correspond to PDF 00-033-0664. 27 Finally, the XRD pattern of the DFG/PbFeCr electrode fabricated with PbFe 11 CrO 19 is displayed in Fig. 3d.…”