A facile hydrothermal route for the synthesis of ¦Á-FeOOH with controlled morphology

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• 作者：Valentin R?di?oiu^a ; ^{vraditoiu@icechim.ro} ; Lucian Diamandescu^b ; Mihai Cosmin Corobea^a ; Alina R?di?oiu^a ; Nicolette Popescu-Pogrion^b ; Cristian Andi Nicolae^a
• 关键词：A1. Crystal structure ; A1. Nanostructures ; A2. Hydrothermal crystal growth ; B1. Oxides ; B1. Surfactants
• 刊名：Journal of Crystal Growth
• 出版年：2012
• 出版时间：1 June, 2012
• 年：2012
• 卷：348
• 期：1
• 页码：40-46
• 全文大小：987 K

文摘

Nanoscaled ¦Á-FeOOH (goethite) with controlled morphology was synthesized via hydrothermal reaction at 145-155 ¡ãC from ferrous ions and an oxidant in the presence of a cationic surfactant. The formation of ¦Á-FeOOH was confirmed by X-ray diffraction (XRD), M?ssbauer spectroscopy, FT-IR analysis and visible diffuse reflectance spectroscopy. The morphology of the product was analyzed by transmission electron microscopy (TEM). The particles obtained by the proposed method have a medium size of about 35 nm. The proposed growth mechanism takes into account two possible simultaneous pathways consisting of direct electrostatic interaction between FeOH groups and cetyltrimethylammonium bromide (CTAB) and adsorption of bicarbonate ions on the ¦Á-FeOOH surface followed by complexation of CTAB through ammonium head groups.