Fe is usually adsorbed to the surface of iron-bearing clay, and iron (hydr)oxide in groundwater. However, the reductive activity of Fe(OH), a prevalent intermediate during the transformation of Fe, remains unclear. In this study, high-purity Fe(OH) was synthesized and tested for its activity in the degradation of carbon tetrachloride (CT). XRD data confirm that the synthesized material is a pure Fe(OH) crystal, exhibiting sharp peaks of (001) and (100) facets. Zeta potential analysis confirms that the off-white Fe(OH) is a colloidal suspension with a positive charge of ∼+35-50 mV. FTIR spectra reveal the formation of a coordination compound Fe with OH/OD, derived from NaOH/OD. SEM and HRTEM results demonstrate that the Fe(OH) crystal has a regular octahedral structure with a size of ∼30-70 nm and average lattice spacings of 2.58 Å. Mössbauer spectrum verifies that the Fe in Fe(OH)/Fe(OD) is hexacoordinated with six Fe-O bonds. XAFS data demonstrate that the Fe-O bonds become shorter as the OH:Fe(II) ratios increase. DFT results indicate that the (100) crystal face of Fe(OH) more readily transfers electrons to CT. In addition to being adsorbed to iron compounds, structural Fe compounds such as Fe(OH) could also accelerate the electron transfer from Fe to CT through shortened Fe-O bonds. The rate constant of CT reduction by Fe(OH) is as high as 0.794 min when the OH:Fe(II) ratio is 2.5 in water. This study aims to enhance our understanding of the structure-reactivity relationship of Fe compounds in groundwater, particularly in relation to electron transfer mechanisms.
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