Selective synthesis of Fe3O4, γ-Fe2O3, and α-Fe2O3 using cellulose-based composites as precursors. Issue 3 (4th January 2016)

• Record Type: Journal Article
• Authors: Liu, Shan; Yao, Ke; Fu, Lian-Hua; Ma, Ming-Guo
• Is Part Of: RSC advances. Volume 6:Issue 3(2016)
• Page Start: 2135
• Page End: 2140
• Publication Date: 2016-01-04
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra22985e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Iron oxide with various phases such as Fe3 O4, γ-Fe2 O3, and α-Fe2 O3 has been selective successfully synthesized using cellulose-based composites as precursors, which were obtained at 180 °C for 45 min by the microwave-hydrothermal method. Abstract : Iron oxide with various phases such as Fe3 O4, γ-Fe2 O3, and α-Fe2 O3 has been selective successfully synthesized using cellulose-based composites as precursors, which were obtained at 180 °C for 45 min by the microwave-hydrothermal method. The products were characterized with X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), derivative thermogravimetric analysis (DTG), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Fe3 O4, γ-Fe2 O3, and α-Fe2 O3 could be selectively synthesized by changing the calcination temperature and atmosphere. It was found that Fe3 O4 was obtained in the N2 atmosphere. However, γ-Fe2 O3 and α-Fe2 O3 were observed at 300 and 500 °C for 3 h in the air atmosphere, respectively. The as-synthesized Fe3 O4 and γ-Fe2 O3 displayed superparamagnetic characteristics at room temperature via the magnetization measurement. The methylene blue (MB) adsorption capacity of γ-Fe2 O3 (air 300 °C) can reach 98.72% and the adsorption isotherms better fitted Freundlich isotherm models. This work provided a promising strategy for the synthesis of metal and carbon/metal composites using biomass as a precursor.