Journal
NANOTECHNOLOGY
Volume 34, Issue 36, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/acdbd4
Keywords
nanopatterning; ion beam sputtering; ion bombardment; metal sorption; water purification; atomic force microscopy
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Large area highly corrugated and faceted nanoripples are formed on calcite (10.4) faces in a self-organized fashion through defocused ion beam sputtering. The calcite ripples are defined by facets with highly kinked (11.0) and (21.12) terminations as revealed by high resolution atomic force microscopy (AFM) imaging. In situ AFM imaging during exposure to PbCl2 aqueous solution shows that the nanostructured calcite surface enhances Pb uptake.
Following defocused ion beam sputtering, large area highly corrugated and faceted nanoripples are formed on calcite (10.4) faces in a self-organized fashion. High resolution atomic force microscopy (AFM) imaging reveals that calcite ripples are defined by facets with highly kinked (11.0) and (21.12) terminations. In situ AFM imaging during the exposure of such modified calcite surfaces to PbCl2 aqueous solution reveals that the nanostructured calcite surface promotes the uptake of Pb. In addition, we observed the progressive smoothing of the highly reactive calcite facet terminations and the formation of Pb-bearing precipitates elongated in registry with the underlying nanopattern. By SEM-EDS analysis we quantified a remarkable 500% increase of the Pb uptake rate, up to 0.5 atomic weight % per hour, on the nanorippled calcite in comparison to its freshly cleaved (10.4) surfaces. These results suggest that nanostructurated calcite surfaces can be used for developing future systems for lead sequestration from polluted waters.
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