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Fe(II)-induced phase transformation of ferrihydrite: The inhibition effects and stabilization of divalent metal cations

文献类型： 外文期刊

作者： Liu, Chengshuai 1 ; Zhu, Zhenke 2 ; Li, Fangbai 1 ; Liu, Tongxu 1 ; Liao, Changzhong 1 ; Lee, Jey-Jau; Shih, Kaimin;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

2.Chinese Acad Sci, Inst Subtrop Agr, Changsha 410125, Hunan, Peoples R China

3.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China

4.Univ Hong Kong, Dept Civil Engn, Pokfula

关键词： Soil iron cycle;Recrystallization;Metal stabilization;Binding ability;Cation effect

期刊名称：CHEMICAL GEOLOGY （ 影响因子：4.015； 五年影响因子：4.426 ）

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收录情况： SCI

摘要： The Fe(II)-induced phase transformation of iron (hydr)oxides is an important process in the geochemical iron cycle and is one in which the coexisting metal cations inhibit the phase transformation rates. However, the underlying affecting mechanisms by metal cations and the critical property of metal cations that is responsible for the inhibition remain unclear. In this study, we focus on the cation effect of seven divalent cations (denoted as Me(II), including Mg(II), Ca(II), Ba(II), Mn(II), Co(II), Ni(II), and Zn(II)) and their influencing mechanisms on Fe(II)-catalyzed transformation processes of ferrihydrite. At initial reaction conditions (i.e. pH 6.5 and 2.0 mM Fe(II)), the binding ability (the affinity of cations for ferrihydrite surface) of Me(II) was found to affect the ferrihydrite transformation. Me(II) with higher binding abilities reduced the bound-Fe(II) amount on ferrihydrite and decreased the redox potentials of the Fe(II)-catalyzed system to inhibit the transformation rates of ferrihydrite. In addition to the inhibition effect, the Me(II) was partly stabilized in the formed secondary iron minerals. The binding abilities of Me(II) also affected the Fe(II)-induced transformation pathways of ferrihydrite by affecting the amount of bound-Fe(II) on ferrihydrite. Ferrihydrite was first transformed to lepidocrocite and later to goethite and magnetite with Me(II) that had lower binding ability than Fe(II), whereas it was directly transformed to goethite and magnetite when with Me(II) that had higher binding ability than Fe(II). (C) 2016 Elsevier B.V. All rights reserved.

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