One-Step Synthesis of Spherical γ-Fe2O3 Nanopowders and the Evaluation of Their Photocatalytic Activity for Orange I Degradation. (19th August 2015)

• Record Type: Journal Article
• Authors: Liang, Chunhua; Liu, Hui; Zhou, Jianmin; Peng, Xiaochun; Zhang, Haizhou
• Other Names: Vione Davide Academic Editor.
• Is Part Of: Journal of chemistry. Volume 2015(2015)
• Publication Date: 2015-08-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1155/2015/791829
• Languages: English
• ISSNs: 2090-9063

Abstract

Abstract : Maghemite ( γ -Fe2 O3 ) nanopowders were synthesized under aeration (oxidizing) conditions by aqueous synthesis in this study. The microstructures of the prepared powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and BET-BJH. The XRD analysis and the chemical experiments showed that well-crystallized γ -Fe2 O3 nanoparticles were successfully obtained with a mean particle size of approximately 17 nm. The prepared γ -Fe2 O3 was spherical with a BET surface area of 14.357 m 2 /g and a total pore volume of 0.050 cm 3 /g. Varying the reaction conditions, such as pH, temperature, and reaction time, we obtained crystallized γ -Fe2 O3 powders with different crystallization extent and different particle sizes. When the pH of the reaction suspension was increased, the reaction time was prolonged, and the reaction temperature was increased, the γ -Fe2 O3 powders underwent superior crystallization and had larger particle sizes. All the obtained γ -Fe2 O3 powders had significant photocatalytic activities under both UV and visible light irradiation for Orange I degradation, and the powders with better crystallization and larger particle size had relatively lower activities for Orange I photocatalytic degradation. The one-step aqueous synthesis method presented in this paper may provide an advantageous pathway to synthesize large quantities of this important iron oxide.