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Did Salts in Seawater Play an Important Role in the Adsorption of Molecules on Minerals in the Prebiotic Earth? The Case of the Adsorption of Thiocyanate onto Forsterite-91.
Ferreira, Giulio Wilgner; Samulewski, Rafael Block; Ivashita, Flávio Francisco; Paesano, Andrea; Urbano, Alexandre; Zaia, Dimas Augusto Morozin.
Afiliación
  • Ferreira GW; Laboratório de Química Prebiótica-LQP, Departamento de Química, Universidade Estadual de Londrina, CEP 86057-970, Londrina, PR, Brazil.
  • Samulewski RB; COLIQ - Coordenação de Licenciatura em Química, Universidade Tecnológica Federal do Paraná UTFPR Campus Apucarana, CEP 86812-460, Apucarana, PR, Brazil. blockeness@gmail.com.
  • Ivashita FF; Departamento de Física-CCE, Universidade Estadual de Maringá, 87020-900, Maringá, PR, Brazil.
  • Paesano A; Departamento de Física-CCE, Universidade Estadual de Maringá, 87020-900, Maringá, PR, Brazil.
  • Urbano A; Departamento de Física Teórica e Experimental, UFRN, Av. Sen. Salgado Filho, 3000, Lagoa Nova, 59078-970, Natal, RN, Brazil.
  • Zaia DAM; Departamento de Física-CCE, Universidade Estadual de Londrina, CEP 86057-970, Londrina, PR, Brazil.
Orig Life Evol Biosph ; 53(3-4): 127-156, 2023 Dec.
Article en En | MEDLINE | ID: mdl-37676558
Thiocyanate may have played as important a role as cyanide in the synthesis of several molecules. However, its concentration in the seas of the prebiotic Earth could have been very low. Thiocyanate was dissolved in two different seawaters: a) a composition that comes close to the seawater of the prebiotic Earth (seawater-B, Ca2+ and Cl-) and b) a seawater (seawater-A, Mg2+ and SO42-) that could be related to the seas of Mars and other moons in the solar system. In addition, forsterite-91 was a very common mineral on the prebiotic Earth and Mars. Two important results are reported in this work: 1) thiocyanate adsorbed onto forsterite-91 and 2) the amount of thiocyanate adsorbed, adsorption thermodynamic, and adsorption kinetic depend on the composition of the artificial seawater. For all experiments, the adsorption was thermodynamically favorable (ΔG < 0). The adsorption data fitted well in the Freundlich and Langmuir-Freundlich models. When dissolving thiocyanate in seawater 4.0-A-Gy and seawater 4.0-B-Gy, the adsorption of thiocyanate onto forsterite-91 was ruled by enthalpy and entropy, respectively. As shown by n values, the thiocyanate/foraterite-91 system is heterogeneous. For all kinetic data, the pseudo-first-order model presented the best fit. The constant rate for thiocyanate dissolved in seawater 4.0-A-Gy was twice that compared to thiocyanate dissolved in seawater 4.0-B-Gy or ultrapure-water. The interaction between thiocyanate and Fe2+ of forsterite-91 was with the nitrogen atom of thiocyanate. In the presence of thiocyanate, sulfate interacts with forsterite-91 as an inner-sphere surface complex, and without thiocyanate as an outer-sphere surface complex.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Sales (Química) / Tiocianatos Idioma: En Revista: Orig Life Evol Biosph Asunto de la revista: BIOLOGIA / BIOLOGIA MOLECULAR Año: 2023 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Países Bajos
Texto completo
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Sales (Química) / Tiocianatos Idioma: En Revista: Orig Life Evol Biosph Asunto de la revista: BIOLOGIA / BIOLOGIA MOLECULAR Año: 2023 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Países Bajos