Samulewski Rafael Block, Graff Ismael Leandro, Nemšák Slavomír, Zaia Dimas Augusto Morozin
Programa de Pós-Graduação em Ciência e Engenharia de Materiais (PPGCEM), Universidade Tecnológica Federal do Paraná UTFPR, Apucarana, Paraná CEP 86812-460, Brazil.
Departamento de Física, Universidade Federal do Paraná UFPR, Curitiba, Paraná CEP 81531-980, Brazil.
ACS Omega. 2025 Mar 25;10(13):13377-13387. doi: 10.1021/acsomega.4c11450. eCollection 2025 Apr 8.
Understanding the chemical and geological conditions of early Earth is crucial to unraveling the processes that led to the evolution of life. Iron, abundant in the early oceans, likely played a significant role in the evolution of life, particularly in the form of minerals that supported the emergence of the first life forms. This article investigates the catalytic effects of cyanide and thiocyanate ions on magnetite samples synthesized under conditions that simulate the early Earth. Magnetite samples were characterized using X-ray photoelectron spectroscopy (XPS), Fe L near-edge X-ray absorption fine structure (NEXAFS), transmission electron microscopy (TEM), and magnetization measurements. The results reveal variations in elemental composition influenced by synthesis conditions, with cyanide ions promoting the formation of magnetite and seawater and thiocyanate inducing the formation of ferrihydrite and goethite, respectively, along with magnetite. These discoveries enrich our understanding of Earth's earliest geochemical processes, contribute to new material synthesis routes, and help environmental science.
了解早期地球的化学和地质条件对于揭示导致生命演化的过程至关重要。早期海洋中富含铁，铁可能在生命演化中发挥了重要作用，特别是以支持第一批生命形式出现的矿物质形式。本文研究了氰化物和硫氰酸根离子对在模拟早期地球条件下合成的磁铁矿样品的催化作用。使用X射线光电子能谱（XPS）、Fe L近边X射线吸收精细结构（NEXAFS）、透射电子显微镜（TEM）和磁化测量对磁铁矿样品进行了表征。结果表明，合成条件影响元素组成的变化，氰离子促进磁铁矿和海水的形成，硫氰酸根离子分别诱导形成纤铁矿和针铁矿以及磁铁矿。这些发现丰富了我们对地球最早地球化学过程的理解，为新材料合成路线做出了贡献，并有助于环境科学。
