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oai:docta.ucm.es:20.500.14352/875792026-01-26T13:08:32Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Barelli, Matteo author Casado, Santiago author Cassin, Felix author Pimentel Guerra, Carlos author Pina Martínez, Carlos Manuel author Giordano, Maria Caterina author Buatier de Mongeot, Francesco author Gnecco, Enrico author 2023-06-23 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 (2$\overline{1}$.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. 1361-6528 10.1088/1361-6528/acdbd4 https://hdl.handle.net/20.500.14352/87579 https://iopscience.iop.org/article/10.1088/1361-6528/acdbd4 Highly efficient sequestration of aqueous lead on nanostructured calcite substrates