【摘要】 运用了液相均匀沉淀法较为经济地制备纳米α-Fe₂O₃粉末。通过在合成时是否添加或者不添加硬脂酸（C8H36O2）或十二烷基苯磺酸钠（SDBS,C18H29NaO3S）等分散剂,研究了纳米α-Fe₂O₃晶粒形核和长大的特征。借助XRD和SEM表征,可以发现:不添加分散剂的条件下制备的α-Fe₂O₃粉末生成了较为粗大的晶粒,添加了SDBS的反应物则得到了均匀分布的、有着规则多面体外形、晶粒粒径约40nm的α-Fe₂O₃粉末;而添加硬脂酸（C8H36O2）分散剂则制备得到了无定型、粒径约10nm的α-Fe₂O₃粉末。光催化测试结果表明不仅尺寸效应会影响光催化能力,晶化完整性也是十分重要的影响因素。适当添加分散剂有助于抑制α-Fe₂O₃粉末成核以及结晶过程中的团聚,从而使得生成的晶粒更细小。而加入不同分散剂的条件下,其影响水平也是十分不一样的,这可能是由于分散剂中的阴离子与Fe3+发生了配位反应的结果。最后,光催化实验结果表明添加了SDBS分散剂的例子要明显好于不添加分散剂和添加了硬脂酸得到的纳米α-Fe₂O₃粉末。更多还原

【Abstract】 In order to find an economic and effective synthesis method for industry production ofα-Fe₂O₃ nanopowders,here we did experimental study of the liquid-phase sediment for nanopowders.Through adding dispersion organic matters such as stearic acid（C8H36O2）or twelve benzene sulfonate（SDBS,C18H29NaO3S）,we obtainedα-Fe₂O₃ powders with regular polyhedron shape and grain size ranging from 10⁸0nm.The photon-catalyst measurements show that theα-Fe₂O₃ nanopowders own better degeneration capacity of organic matters.The particles nucleated and agglomerated during growth up process are controlled by those dispersion matters.These powders filling with dispersion matters make the grain loose and smaller in size.It is attributed to the coordination reaction of anion with Fe³⁺.更多还原