INTERFACIAL ELECTRON-TRANSFER IN COLLOIDAL SPINEL IRON-OXIDE - CONVERSION OF FE3O4-GAMMA-FE2O3 IN AQUEOUS-MEDIUM
INTERFACIAL ELECTRON-TRANSFER IN COLLOIDAL SPINEL IRON-OXIDE - CONVERSION OF FE3O4-GAMMA-FE2O3 IN AQUEOUS-MEDIUM
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DOI：
10.1016/0021-9797(88)90036-7
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发表时间：
1988-10-01
影响因子：
9.9
通讯作者：
TRONC, E
中科院分区：
文献类型：
--
作者：
JOLIVET, JP;TRONC, E
用电位法、X射线衍射法和穆斯堡尔谱研究了胶体Fe_3O_4(∼)在弱酸性介质(pH=2-2.5)中的行为。报道了FeII的完全和唯一去除，没有明显的粒度影响。建议后续的Fe_3O_4-→γ-Fe_2O_3转化对电子核面转移还原的FeII离子进行选择性表面浸出。在溶液中存在FeIII时，发生了类似的转化，但其特征是表面存在显著的结构无序。
The behaviour of colloidal Fe3O4(∼100 Å) in weakly acidic medium (pH 2-2.5) has been investigated by potentiometry, X-ray diffraction, and Mössbauer spectroscopy. Complete and exclusive removal of FeII without noticeable particle size effect is reported. Subsequent Fe3O4→ γFe2O3transformation is suggested to proceed with selective surface leaching of FeII ions reduced by electron core-to-surface transfer. An analogous conversion is experienced in the presence of FeIII in solution, but it is characterized by significant structural disordering in the surface.