.png){kind=icon}
.png){kind=icon}
Return
Fe(II)-doped hydrotalcite in cement systems: Structure and Cr(VI) immobilization
.png){kind=icon}
PRE
AI
D
J
B
S
B
DOI：10.1016/j.cemconres.2026.108352.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Fe(II)-doped hydrotalcite can form in cement systems under anoxic conditions, e.g., landfills and geological repositories, but its molecular structure and environmental function remain largely unexplored. Here, the molecular structure and Cr(VI) immobilization mechanism of Fe(II)-hydrotalcite are investigated through a combination of synchrotron-based X-ray absorption spectroscopy (XAS) and molecular simulations. Fe(II) can substitute for Mg(II) in the hydrotalcite main layer, forming a continuous solid solution and inducing local structural distortion likely caused by differences in ionic radius and electron distribution. The incorporation of Fe(II) markedly enhances the Cr(VI) retention capacity, increasing the removal efficiency from ~10% to nearly 100%. Combined Fe and Cr K-edge XAS reveals that Cr(VI) is reduced to Cr(III), while Fe(II) is oxidized to Fe(III). The Cr(III) species are likely incorporated into a goethite-like phase. These findings provide molecular-level insight into the structure-redox-immobilization relationship of Fe(II)-hydrotalcite and offer guidance for designing cementitious materials capable of long-term retention of toxic oxyanions.
Journal
IF:
13.1
Papers:
6.9K
Citations:
7.5W
Organization
Cited Papers