RT Journal Article
T1 Highly efficient sequestration of aqueous lead on nanostructured calcite substrates
A1 Barelli, Matteo
A1 Casado, Santiago
A1 Cassin, Felix
A1 Pimentel, Carlos
A1 Pina Martínez, Carlos Manuel
A1 Giordano, Maria Caterina
A1 Buatier de Mongeot, Francesco
A1 Gnecco, Enrico
AB 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.
PB IOP Publishing
SN 1361-6528
YR 2023
FD 2023-06-23
LK https://hdl.handle.net/20.500.14352/87579
UL https://hdl.handle.net/20.500.14352/87579
LA eng
NO Ministry of Ciencia e Innovación
NO Ministero dell'Università e della Ricerca
NO National Recovery and Resilience Plan
NO European Union
DS Docta Complutense
RD 6 abr 2025