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dc.contributor.authorRenard, F.
dc.contributor.authorPutnis, Christine
dc.contributor.authorMontes-Hernandez, G.
dc.contributor.authorKing, H.
dc.contributor.authorBreedveld, G.
dc.contributor.authorOkkenhaug, G.
dc.identifier.citationRenard, F. and Putnis, C. and Montes-Hernandez, G. and King, H. and Breedveld, G. and Okkenhaug, G. 2018. Sequestration of Antimony on Calcite Observed by Time-Resolved Nanoscale Imaging. Environmental Science and Technology. 52 (1): pp. 107-113.

Antimony, which has damaging effects on the human body and the ecosystem, can be released into soils, ground-, and surface waters either from ore minerals that weather in near surface environments, or due to anthropogenic releases from waste rich in antimony, a component used in batteries, electronics, ammunitions, plastics, and many other industrial applications. Here, we show that dissolved Sb can interact with calcite, a widespread carbonate mineral, through a coupled dissolution–precipitation mechanism. The process is imaged in situ, at room temperature, at the nanometer scale by using an atomic force microscope equipped with a flow-through cell. Time-resolved imaging allowed following the coupled process of calcite dissolution, nucleation of precipitates at the calcite surface and growth of these precipitates. Sb(V) forms a precipitate, whereas Sb(III) needs to be oxidized to Sb(V) before being incorporated in the new phase. Scanning-electron microscopy and Raman spectroscopy allowed identification of the precipitates as two different calcium–antimony phases (Ca2Sb2O7). This coupled dissolution–precipitation process that occurs in a boundary layer at the calcite surface can sequester Sb as a solid phase on calcite, which has environmental implications as it may reduce the mobility of this hazardous compound in soils and groundwaters.

dc.publisherAmerican Chemical Society
dc.titleSequestration of Antimony on Calcite Observed by Time-Resolved Nanoscale Imaging
dc.typeJournal Article
dcterms.source.titleEnvironmental Science and Technology
curtin.departmentSchool of Molecular and Life Sciences (MLS)
curtin.accessStatusFulltext not available

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