Artificial coral reefs, electrochemistry and calcium carbonate: electrodeposited coral-like aragonite

TitreArtificial coral reefs, electrochemistry and calcium carbonate: electrodeposited coral-like aragonite
Publication TypeConference Proceedings
Year of Publication2015
AuthorsC. Da Silva, G, D. Nguyen, D, Zanibellato, A, Carré, C, Gil, O, Jeannin, M, Sabot, R, Serres, A, GUNKEL-GRILLON, P, Verjat, N, Benaissa, B, Gascoin, S, Retoux, R, Riffault, B, Chateigner, D
Conference Name29th European Crystallography Congress (ECM29)
Date Published08/2015
PublisherActa Crystallographica Section A: Foundations and Advances
Conference LocationRovinj, Croati
Mots-clésaragonite, artificial coral reef, calcium carbonate, coral, electrochemistry

Global warming’s largest influence on coastal ranges remains massive erosion. Artificial reinforcements often suffer instable basements, in particular on large and sandy beaches. One potentially large-scale approach to consolidate such coasts rely in the use of electrodeposition of conglomerates of calcium carbonate, substituting the weak mechanical loci, at no environmental cost. In this approach, natural sea-water provides the necessary elements (Ca and CO2) for the precipitation of calcium carbonate around the working electrode that can be easily adapted to the local geometry, with no a priori limit in scale (Géocorail ®). The calcium carbonate deposits on metallic electrodes and on extended regions around them, ages and creates bonds between mineral sediments coming from sea waves carriage, and then makes a mechanically resistant agglomerate “Géocorail”. The deposited calcium carbonate is the aragonite polymorph, one of the most present biominerals in the oceans, in mollusc shells and corals. It is then important to compare our Géocorail with biominerals in order to optimize our elaboration process for eventual neo-fauna colonisation of the reinforcements. In this work, we selected few dead specimen of coral species from Noumea, Nouvelle Calédonie, Cancun, Mexico and Saint François, Guadalupe, and compared them with the artificially grown electrochemical samples, with the help of x-ray diffraction and SEM imaging.