Geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric CO2 of anthropogenic origin

Geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric CO2 of anthropogenic origin

An experimental analysis was made of the glauconite dissolution rate as a function of pH. The results were used to model the geochemical evolution of glauconitic shelf sediments injected with CO2 and estimate the possibilities and limitations for sequestering CO2 in the form of minerals through carb...

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Prif Awduron: Fernández-Bastero, S, García, T, Santos, A, Gago-Dupont, Luis
Fformat: Online
Iaith:eng
Cyhoeddwyd: Iniversidad Autónoma de Baja California 2005
Mynediad Ar-lein:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/24
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id oai:cienciasmarinas.com.mx:article-24
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Fernández-Bastero, S
García, T
Santos, A
Gago-Dupont, Luis
spellingShingle Fernández-Bastero, S
García, T
Santos, A
Gago-Dupont, Luis
Geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric CO2 of anthropogenic origin
author_facet Fernández-Bastero, S
García, T
Santos, A
Gago-Dupont, Luis
author_sort Fernández-Bastero, S
title Geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric CO2 of anthropogenic origin
title_short Geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric CO2 of anthropogenic origin
title_full Geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric CO2 of anthropogenic origin
title_fullStr Geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric CO2 of anthropogenic origin
title_full_unstemmed Geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric CO2 of anthropogenic origin
title_sort geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric co2 of anthropogenic origin
description An experimental analysis was made of the glauconite dissolution rate as a function of pH. The results were used to model the geochemical evolution of glauconitic shelf sediments injected with CO2 and estimate the possibilities and limitations for sequestering CO2 in the form of minerals through carbonation reactions. The experimental results show how, under acidic conditions, glauconite is slightly more soluble than other silicates, producing more insoluble carbonated products. The dissolution mechanism is incongruent at very acidic pH values and tends to be congruent at intermediate and neutral values. The reactive surface decreases during the process as a result of the formation of an amorphous residue. Kinetic data were used to model the reactions of carbonation in marine sediments using reaction/speciation calculations. This study shows that, in the case of glauconite, the efficiency of CO2 sequestration depends primarily on two factors: the dissolution/speciation kinetics of CO2 in sediments and the kinetics of Fe2+ release. The greatest limitation for the implementation of this process is that pH evolves to more acidic values. The results suggest that, in the medium term, this process could be technically optimized by modifying the neutralization response of sediments through the injection of alkalinizing agents and by appropriately selecting the mode of injection as well as the composition of the sediments and of the most favourable diagenetic zones.
publisher Iniversidad Autónoma de Baja California
publishDate 2005
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/24
_version_ 1715723925789343744
spelling oai:cienciasmarinas.com.mx:article-242019-04-04T17:56:37Z Geochemical potentiality of glauconitic shelf sediments for sequestering atmospheric CO2 of anthropogenic origin Potencialidad geoquímica de sedimentos glauconíticos de plataforma para la fijación de CO2 atmosférico de origen antropogénico Fernández-Bastero, S García, T Santos, A Gago-Dupont, Luis glauconite dissolution continuous-flow solution CO2 sequestration carbonation reactions reaction/speciation models disolución de glauconita baño de flujo continuo fijación de CO2 reacciones de carbonatación modelos especiación-reacción An experimental analysis was made of the glauconite dissolution rate as a function of pH. The results were used to model the geochemical evolution of glauconitic shelf sediments injected with CO2 and estimate the possibilities and limitations for sequestering CO2 in the form of minerals through carbonation reactions. The experimental results show how, under acidic conditions, glauconite is slightly more soluble than other silicates, producing more insoluble carbonated products. The dissolution mechanism is incongruent at very acidic pH values and tends to be congruent at intermediate and neutral values. The reactive surface decreases during the process as a result of the formation of an amorphous residue. Kinetic data were used to model the reactions of carbonation in marine sediments using reaction/speciation calculations. This study shows that, in the case of glauconite, the efficiency of CO2 sequestration depends primarily on two factors: the dissolution/speciation kinetics of CO2 in sediments and the kinetics of Fe2+ release. The greatest limitation for the implementation of this process is that pH evolves to more acidic values. The results suggest that, in the medium term, this process could be technically optimized by modifying the neutralization response of sediments through the injection of alkalinizing agents and by appropriately selecting the mode of injection as well as the composition of the sediments and of the most favourable diagenetic zones. En este estudio se analizó experimentalmente la velocidad de disolución de la glauconita en función del pH. Los resultados se utilizaron para modelar la evolución geoquímica de sedimentos marinos glauconíticos de la plataforma continental, ante una inyección de CO2, y estimar las posibilidades y limitaciones para su fijación en forma de minerales a través de reacciones de carbonatación. Los resultados experimentales muestraron como, en condiciones ácidas, la glauconita es ligeramente más soluble que otros silicatos, dando lugar a productos carbonatados más insolubles. El mecanismo de disolución es incongruente a valores de pH muy ácidos y tiende a ser congruente para valores intermedios y neutros. La superficie reactiva disminuye en el curso del proceso como resultado de la formación de un residuo amorfo. Los datos cinéticos se han empleado para modelar las reacciones de carbonatación en sedimentos marinos mediante cálculos especiación-reacción. En el estudio se evidencia que, para el caso de la glauconita, la eficacia en la fijación de CO2 depende principalmente de dos factores: la propia cinética de disoluciónespeciación del CO2 en los sedimentos y la cinética de liberación del Fe2+. La mayor limitación del proceso de cara a su implementación, es la evolución del pH hacia valores ácidos. Los resultados sugieren que, a mediano plazo, este proceso podría ser optimizado de forma técnica modificando la respuesta de neutralización de los sedimentos mediante la inyección de agentes alcalinizantes y con una selección adecuada, tanto del modo de inyección como de la composición de los sedimentos y de las zonas diagenéticas más favorables. Iniversidad Autónoma de Baja California 2005-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/24 10.7773/cm.v31i4.24 Ciencias Marinas; Vol. 31 No. 4 (2005); 593-615 Ciencias Marinas; Vol. 31 Núm. 4 (2005); 593-615 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/24/9

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