NDLI: Micro/nanostructured α-Fe<sub>2</sub>O<sub>3</sub> spheres: synthesis, characterization, and structurally enhanced visible-light photocatalytic activity

Content Provider	Royal Society of Chemistry (RSC)
Author	Liu, Gang Wang, Hongqiang Wang, Guozhong Ng, Dickon H. L. Deng, Quan Kong, Mingguang Cai, Weiping
Copyright Year	2012
Abstract	Micro/nanostructured α-Fe2O3 spheres (MNFSs) were fabricated via a surfactant- and template-free method, involving the hydrothermal synthesis of FeCO3 precursor firstly and a subsequent thermal decomposition treatment. The product was characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. The MNFSs had an average diameter of about 5 μm, and each contained subunits of interlinked and elongated particles with size less than 30 nm. The UV-Vis spectrum of MNFSs exhibited visible-light absorption. The visible-light photocatalytic activity of MNFSs was evaluated by using them to degrade the rhodamine 6G pollutant in water at ambient temperature under different parameters such as pH value, the amount of MNFSs and H2O2. We also found that the visible-light photocatalytic activity of MNFSs was higher than that of the micron- and nano-sized α-Fe2O3 particles. The reaction rate of MNFSs was more than twice that of nano-sized α-Fe2O3 and nearly 12 times faster than that of the micron-sized α-Fe2O3. This high photocatalytic feature of MNFSs was attributed to the high specific surface area together with their special porous structure. Importantly, these characteristics could control the rate of releasing ·OH and thus improve the utilization efficiency of ·OH. MNFSs can be easily recycled from the treated water using a magnet due to its magnetic behavior. There was no obvious decrease of the photocatalytic activity of MNFSs after being used.
Starting Page	9704
Ending Page	9713
Page Count	10
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	19
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm31586f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Surfactant Hydrothermal synthesis X-ray crystallography Scanning electron microscope Transmission electron microscopy Micrometre Rhodamine PH Hydrogen peroxide Reaction rate Specific surface area
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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