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Facet-dependent Antimony Isotope Fractionation during Sb(V) Adsorption on Hematite
Weiqing Zhou1,2,3, Jianwei Zhou1,2,3, Yanxin Wang1,2
1School of Environmental Studies, China University of Geosciences, Wuhan 430078, China.
Environmental Science & Technology
|February 11, 2026
Summary
Hematite facets influence antimony (Sb) adsorption and isotopic fractionation. The (012) facet shows stronger adsorption than (001), with lighter Sb isotopes preferentially enriching on both surfaces.
Area of Science:
- Geochemistry
- Environmental Science
- Mineralogy
Background:
- Hematite is prevalent in soil and water, impacting antimony (Sb) environmental fate via adsorption.
- The specific roles of different hematite facets in Sb isotopic fractionation remain poorly understood.
Purpose of the Study:
- To investigate Sb(V) adsorption mechanisms on hematite (001) and (012) facets.
- To elucidate the Sb isotope fractionation mechanisms associated with these adsorption processes.
Main Methods:
- Batch adsorption experiments were conducted.
- Extended X-ray absorption fine structure (EXAFS) spectroscopy was employed.
- Density functional theory (DFT) calculations were utilized.
Main Results:
- The (012) hematite facet exhibited stronger Sb(V) adsorption capacity than the (001) facet.
- Sb adsorption involved edge-sharing complexes on (001) and coexisting edge/corner-sharing complexes on (012).
- Lighter Sb isotopes were preferentially enriched on both facets via equilibrium fractionation, independent of pH and concentration.
Conclusions:
- The (001) facet's weaker Sb-Fe shell complexation led to greater Sb isotope fractionation (Δ¹²³Sb = 14.11 ± 0.03 ‰) compared to the (012) facet (Δ¹²³Sb = 9.8 ± 0.02 ‰).
- Findings advance understanding of Sb isotope fractionation on mineral surfaces.
- Provides insights for predicting metal adsorption and isotope fractionation in environmental systems.
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