Electrodeposition of maghemite (γ-Fe₂O₃) nanoparticles

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• 作者：Hosik Park ; Perla Ayala ; Marc A. Deshusses ; Ashok Mulch ; ani ; Heechul Choi ; Nosang V. Myung
• 关键词：Electrodeposition ; Maghemite ; Nanoparticles ; Environmental remediation ; As(V) ; Adsorption
• 刊名：Chemical Engineering Journal
• 出版年：2008
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 May 2008
• 卷：139
• 期：1
• 页码：208-212
• 文件大小：813 K

摘要

Crystalline maghemite (γ-Fe₂O₃) nanoparticles were cathodically electrodeposited at room temperature from environmentally benign electrolytes. The shape, size, and production rate of nanoparticles were strongly influenced by electrochemical conditions (e.g. FeCl₃ concentration, current density). X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analysis indicated that randomly oriented polycrystalline maghemite nanoparticles were synthesized with the (3 1 1) and (4 4 0) peaks as the main diffraction peaks. Transmission electron microscopy (TEM) images revealed that average particle size decreased from approximately 23 to 7 nm with increased current density. Magnetic saturation (M_S) of maghemite nanoparticles was determined to be 66 emu g⁻¹ (66 Am² kg⁻¹) at 300 K. The present maghemite nanoparticles showed a greater As(V) adsorption compared to iron nanoparticles, which might be attributed to a higher specific surface area.