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Interaction of Fe$$^{II}$$ and Si under anoxic and reducing conditions; Structural characteristics of ferrous silicate co-precipitates

Francisco, P. C. M.; 三ツ井 誠一郎; 石寺 孝充; 舘 幸男; 土井 玲祐; 塩飽 秀啓

Francisco, P. C. M.; Mitsui, Seiichiro; Ishidera, Takamitsu; Tachi, Yukio; Doi, Reisuke; Shiwaku, Hideaki

The interaction of Fe$$^{II}$$ and Si is at the heart of many critical geochemical processes in diverse natural and engineered environments. The interaction of these elements results in the formation of Fe$$^{II}$$-silicate phases, which play important roles in regulating the solubility and bioavailability of both Fe$$^{II}$$ and Si, as well as serve as sinks for trace elements. Therefore, a detailed understanding of their structural characteristics may provide insights that may help in predicting their reactivity and stability under different conditions. In this work, co-precipitates with different Si/Fe$$^{II}$$ ratios (0.5, 1.0 and 2.0) were synthesized under anoxic and reducing conditions at different solution pH (7, 9 and 11). The co-precipitates were studied using X-ray diffraction (XRD), infrared (IR) spectroscopy and Fe $$K$$-edge X-ray absorption spectroscopy (XAS). The results show the immediate and rapid formation of phyllosilicate-like local structures from solution. These incipient structural units lack long-range order but may serve as the precursors of crystalline phases.

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