School of Material Science and Engineering, University of Jinan, Jinan, 250022, PR China.
J Nanosci Nanotechnol. 2019 Dec 1;19(12):8036-8044. doi: 10.1166/jnn.2019.16807.
In this paper, -Fe₂O₃ with different morphologies were controllable synthesized via a two-step route using NO₃ as a guiding agent. Environmentally friendly hydrothermal reaction was used to synthesize -FeOOH with different morphologies. The concentration of sodium nitrate was adjusted to control the shapes and sizes of -FeOOH. -Fe₂O₃ is obtained via further calcination. By changing the concentration of sodium nitrate, the morphology could be tuned from nanoflowers which were composed by nanorods to single nanorod. The change of morphology is ascribed to the selective adsorption of NO₃ which lead to -FeOOH to grow along the 〈001〉 direction. At the same time, an aqueous iron chloride was used as the precursor and the effect of ethanol as solvent on the morphology of -Fe₂O₃ was investigated. Due to the selective adsorption of ethanol to the iron oxide crystal face, the morphology of -Fe₂O₃ changes from the original sphere to the hexagonal nanosheet. Meanwhile, the electrochemical properties of iron oxide with different morphologies and the adsorption properties of Congo red were explored.
本文采用两步法，以硝酸盐为导向剂，可控合成了不同形貌的-Fe₂O₃。采用绿色环保的水热反应合成了不同形貌的-FeOOH。通过调节硝酸钠的浓度来控制-FeOOH 的形貌和尺寸。进一步煅烧得到-Fe₂O₃。通过改变硝酸钠的浓度，可以将形貌从由纳米棒组成的纳米花调变为单根纳米棒。形貌的变化归因于 NO₃ 的选择性吸附，导致-FeOOH 沿着〈001〉方向生长。同时，以氯化铁水溶液为前驱体，考察了乙醇作为溶剂对-Fe₂O₃形貌的影响。由于乙醇对氧化铁晶面的选择性吸附，-Fe₂O₃ 的形貌由原来的球体变为六方纳米薄片。同时，探讨了不同形貌氧化铁的电化学性能和刚果红的吸附性能。
