Redox properties of structural Fe in smectite clay minerals
Redox properties of structural Fe in smectite clay minerals
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DOI：
10.1021/bk-2011-1071.ch017
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Neumann;M. Sander;T. Hofstetter
中科院分区：
文献类型：
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作者：
A. Neumann;M. Sander;T. Hofstetter
粘土矿物中结构铁的氧化还原反应在土壤地球化学过程和环境中污染物的归趋中起着重要作用。然而，粘土矿物中Fe的许多氧化还原性质知之甚少，从而限制了使结构Fe参与电子转移反应的因素的知识。本章总结了粘土矿物中结构铁的氧化还原性质的知识现状。在第一部分中，我们回顾了各种光谱观测与结构铁的还原和氧化，以及如何在铁的氧化态的变化影响的粘土矿物结构和铁的平面2：1粘土矿物的八面体片的结合环境。在第二部分中，我们展示了如何解释Fe的结构变化和排列的信息，以评估粘土矿物中结构Fe的表观反应性和热力学氧化还原性质。
Redox reactions of structural Fe in clay minerals play important roles in biogeochemical processes and for the fate of contaminants in the environment. Many of the redox properties of Fe in clay minerals are, however, poorly understood, thus limiting the knowledge of the factors that make structural Fe participate in electron transfer reactions. This chapter summarizes the current state of knowledge on the redox properties of structural Fe in clay minerals. In the first part, we review the various spectroscopic observations associated with structural Fe reduction and oxidation and how changes in Fe oxidation state affect the clay mineral structure and the binding environment of Fe in the octahedral sheet of planar 2:1 clay minerals. In the second part, we show how information on the structural alterations and arrangement of Fe can be interpreted to assess the apparent reactivity and the thermodynamic redox properties of structural Fe in clay minerals.