Electrochemical limestone synthesis in seawater binds metal grids and sediments for coastal protection

Carré, Charlotte; Zanibellato, Alaric; Achgare, Nesrine; Mahieux, Pierre-Yves; Turcry, Ph; Jeannin, Marc; Sabot, R.

doi:10.1007/s10311-020-01019-4

Cited by 8 publications

(9 citation statements)

References 27 publications

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“…These results confirmed that the calcareous deposit formed by cathodic polarisation was composed of magnesium hydroxide (brucite) and calcium carbonate (mainly aragonite), as previously described [27,35,36]. The formation of brucite in the inner part of the deposit, i.e., closest to the polarised steel (Figure 1), is due to the high pH encountered (pH > 9.5) resulting from the polarisation and the subsequent reduction of oxygen and water [25,37]. Furthermore, aragonite was identified in zone 2, near the seawater (Figure 1), where the pH was close to that usually found for seawater, i.e., 8.2 ± 0.1.…”

Section: Biocalcifying Marine Bacteriasupporting

confidence: 89%

“…CaCO 3 precipitation also occurs in abiotic conditions on metal surfaces under cathodic polarisation in seawater. A calcareous deposit made of a mixture of CaCO 3 and magnesium hydroxide Mg(OH) 2 is formed because the cathodic reactions taking place at the metal surface, i.e., O 2 reduction and/or H 2 O reduction, produce OH − ions and increase the pH at the metal/seawater interface [25]. In the marine environment, such calcareous deposits act as a cement between sediments, shells, and pebbles and give rise to a solid agglomerate that could reinforce dikes and delay the erosion of beaches [26,27].…”

Section: Introductionmentioning

confidence: 99%

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New Biocalcifying Marine Bacterial Strains Isolated from Calcareous Deposits and Immediate Surroundings

et al. 2021

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Marine bacterial biomineralisation by CaCO3 precipitation provides natural limestone structures, like beachrocks and stromatolites. Calcareous deposits can also be abiotically formed in seawater at the surface of steel grids under cathodic polarisation. In this work, we showed that this mineral-rich alkaline environment harbours bacteria belonging to different genera able to induce CaCO3 precipitation. We previously isolated 14 biocalcifying marine bacteria from electrochemically formed calcareous deposits and their immediate environment. By microscopy and µ-Raman spectroscopy, these bacterial strains were shown to produce calcite-type CaCO3. Identification by 16S rDNA sequencing provided between 98.5 and 100% identity with genera Pseudoalteromonas, Pseudidiomarina, Epibacterium, Virgibacillus, Planococcus, and Bhargavaea. All 14 strains produced carbonic anhydrase, and six were urease positive. Both proteins are major enzymes involved in the biocalcification process. However, this does not preclude that one or more other metabolisms could also be involved in the process. In the presence of urea, Virgibacillus halodenitrificans CD6 exhibited the most efficient precipitation of CaCO3. However, the urease pathway has the disadvantage of producing ammonia, a toxic molecule. We showed herein that different marine bacteria could induce CaCO3 precipitation without urea. These bacteria could then be used for eco-friendly applications, e.g., the formation of bio-cements to strengthen dikes and delay coastal erosion.

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Section: Biocalcifying Marine Bacteriasupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

New Biocalcifying Marine Bacterial Strains Isolated from Calcareous Deposits and Immediate Surroundings

et al. 2021

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“…Le DC formé peut alors faire office de liant naturel entre les sédiments, sable, coquillages, galets, conduisant à des structures solides poreuses très résistantes et donnant une grande cohésion à l'ensemble de la structure (Fig. 7b et 7c) [164][165][166]. En effet, ces agglomérats calcomagnésiens présentent une porosité d'environ 25 % et possèdent une résistance mécanique en compression proche de celle d'un matériau cimentaire (mortier ou béton à base de ciment hydraulique).…”

Section: Biocalcification Bactérienne Couplée à La Polarisation Catho...unclassified

“…très peu de transport pour la construction de digues mais aussi permettre le recyclage de certains déchets anthropiques (déchets inertes du BTP riches en carbonate de calcium) [166]. La formation de ces éco-matériaux représente donc une solution alternative très prometteuse pour réduire localement l'érosion des côtes océaniques et protéger le littoral [164,165]. L'entreprise Seacure (anciennement Géocorail) exploite actuellement ce procédé de formation d'éco-matériau par électrochimie (brevet Geocorail ® ), pour concevoir et commercialiser des solutions innovantes et personnalisées pour protéger les ouvrages du littoral (http://www.geocorail.com).…”

Section: Biocalcification Bactérienne Couplée à La Polarisation Catho...unclassified

“…Ces bactéries sont capables d'induire la précipitation de calcite magnésienne (Ca 1-x Mg x CO 3 ) majoritairement sous forme d'haltères. L'enzyme anhydrase carbonique a été détectée chez l'ensemble des quatorze souches et six d'entre elles présentent également une activité uréase, suggérant une synergie entre ces voies métaboliques pour la [164]. The process shown in A consists of cathodically polarising a metal grid embedded in marine sediments (the red arrows represent the electric current allowing cathodic polarisation).…”

Section: Biocalcification Bactérienne Couplée à La Polarisation Catho...unclassified

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La biocalcification bactérienne en milieu marin et ses applications

Vincent

Colin

Lanneluc

et al. 2022

Matériaux & Techniques

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La précipitation du carbonate de calcium (CaCO3) biologiquement induite en milieu marin joue un rôle important dans le cycle biogéochimique du carbone. Cette biocalcification est gouvernée par quatre facteurs clés : le taux de carbone inorganique dissous dont dépend le taux de carbonates (CO32−) dans le système, le taux d’ions calciques (Ca2+), le pH et la disponibilité des sites de nucléation c’est-à-dire des zones de cristallisation primaire de la phase solide du minéral. Les bactéries impliquées dans la biocalcification marine vont alors agir sur un ou plusieurs de ces facteurs. Ce processus naturel, qui se produit dans divers contextes géologiques, peut être imité afin de développer un certain nombre de technologies permettant la séquestration des métaux lourds, la protection des métaux contre la corrosion, la restauration et le renforcement de matériaux préexistants et la consolidation de matériaux granulaires. Cette étude passe en revue les différentes activités métaboliques microbiennes menant à la précipitation du CaCO3 ainsi que leurs applications potentielles en milieu marin.

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Mechanistic Insights into Electrodeposition in Seawater at Variable Electrochemical Potentials

Devi,

Wagner,

Lopez

et al. 2023

Advanced Sustainable Systems

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The classical approach to manufacturing cement and concrete involves considerable and energy‐intensive exploitation of minerals from the environment, calling for alternative and sustainable methods to obtain such resources. Electrodeposition resulting from local pH changes near an oxygen or water reduction electrode can be used to grow valuable minerals in seawater for use in the cement and concrete industries, with the potential to use clean electricity without relying on the mining of resources. Limited knowledge is available about the electrochemical reaction networks that yield mineral precipitates via electrodeposition in seawater, hindering a complete assessment of the promise of such an approach to serving the construction industry. This work presents an investigation of the electrodeposition in seawater as a function of the applied potential. The work identifies multiple electrochemical potential regimes that yield distinct polymorphs, quantities, and production rates of calcium and magnesium‐based minerals due to the varying rates of oxygen reduction and water‐splitting reactions. The quality of the produced minerals is comparable to that of traditionally mined aggregates in terms of morphology and composition, supporting that seawater represents a vast source of raw materials for use in the construction industry upon an enhancement in the efficiency of hydroxide‐producing reactions and the reactor design.

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Electrochemical limestone synthesis in seawater binds metal grids and sediments for coastal protection

Cited by 8 publications

References 27 publications

New Biocalcifying Marine Bacterial Strains Isolated from Calcareous Deposits and Immediate Surroundings

New Biocalcifying Marine Bacterial Strains Isolated from Calcareous Deposits and Immediate Surroundings

La biocalcification bactérienne en milieu marin et ses applications

Mechanistic Insights into Electrodeposition in Seawater at Variable Electrochemical Potentials

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