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dc.contributor.authorAnizelli, Pedro R.
dc.contributor.authorBaú, João Paulo T.
dc.contributor.authorValezi, Daniel Farinha
dc.contributor.authorCanton, Leila C.
dc.contributor.authorCarneiro, Cristine E. A.
dc.contributor.authorDi Mauro, Eduardo
dc.contributor.authorDa Costa, Antônio Carlos Saraiva
dc.contributor.authorGalante, Douglas
dc.contributor.authorBraga, Adriano H.
dc.contributor.authorRodrigues, Fábio
dc.contributor.authorCoronas Ceresuela, Joaquín
dc.contributor.authorCasado Coterillo, Clara 
dc.contributor.authorZaia, Cássia Thaïs Bussamra Vieira
dc.contributor.authorZaia, Dimas A. M.
dc.contributor.otherUniversidad de Cantabriaes_ES
dc.description.abstractMost adsorption experiments are performed under conditions that did not exist on Earth before the life arose on it. Because adsorption is the first step for all other processes (protection against degradation and polymerization), it is important that it is performed under conditions that existed on prebiotic Earth. In this paper, we use an artificial seawater (seawater 4.0 Ga), which contains major cations and anions that could present on the oceans of the prebiotic Earth. In addition, zeolites, with substituted Fe in the framework, and adenine were probably common substances on the prebiotic Earth. Thus, study the interaction between them is an important issue in prebiotic chemistry. There are two main findings described in this paper. Firstly, zeolites with different Si/Fe ratios adsorbed adenine differently. Secondly, XAFS showed that, after treatments with seawater 4.0 Ga and adenine, an increase in the complexity of the system occurred. In general, salts of seawater 4.0 Ga did not affect the adsorption of adenine onto zeolites and adenine adsorbed less onto zeolites with iron isomorphically substituted. The C=C and NH2 groups of adenine interacted with the zeolites. Gypsum, formed from aqueous species dissolved in seawater 4.0 Ga, precipitated onto zeolites. EPR spectra of zeolites showed lines caused by Fe framework and Fe3+ species. TG curves of zeolites showed events caused by loss of water weakly bound to zeolite (in the 30-140 °C range), water bounded to iron species or cations from seawater 4.0 Ga or located in the cavities of zeolites (157-268 °C) and degradation of adenine adsorbed onto zeolites (360-600 °C). Mass loss follows almost the same order as the amount of adenine adsorbed onto zeolites. The XAFS spectrum showed that Fe3+ could be substituted into the framework of the Fe7-ZSM-5 zeolite.es_ES
dc.format.extent44 p.es_ES
dc.rights© 2016, Elsevier. Licensed under the Creative Commons Reconocimiento-NoComercial-SinObraDerivadaes_ES
dc.sourceMicroporous and Mesoporous Materials, 2016, 226, 493-504es_ES
dc.subject.otherPrebiotic chemistryes_ES
dc.subject.otherNucleic acid basees_ES
dc.subject.otherIron zeoliteses_ES
dc.titleAdenine interaction with and adsorption on Fe-ZSM-5 zeolites: A prebiotic chemistry study using different techniqueses_ES

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© 2016, Elsevier. Licensed under the Creative Commons Reconocimiento-NoComercial-SinObraDerivadaExcept where otherwise noted, this item's license is described as © 2016, Elsevier. Licensed under the Creative Commons Reconocimiento-NoComercial-SinObraDerivada