Synthesis of short-range ordered aluminosilicates at ambient conditions
| Autor: | Thilo Rennert, Hergen Breitzke, Erik Reimhult, Max Willinger, Gerd Buntkowsky, Katharina R. Lenhardt |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Aluminium chloride
Science Infrared spectroscopy 020101 civil engineering 02 engineering and technology Article 0201 civil engineering Crystallinity chemistry.chemical_compound Aluminosilicate Specific surface area medicine Multidisciplinary Aqueous solution Chemistry Sorption 04 agricultural and veterinary sciences Mineralogy Chemical engineering Environmental chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Medicine Orthosilicate medicine.drug |
| Zdroj: | Scientific Reports Scientific Reports, Vol 11, Iss 1, Pp 1-13 (2021) |
| ISSN: | 2045-2322 |
| Popis: | We report here on structure-related aggregation effects of short-range ordered aluminosilicates (SROAS) that have to be considered in the development of synthesis protocols and may be relevant for the properties of SROAS in the environment. We synthesized SROAS of variable composition by neutralizing aqueous aluminium chloride with sodium orthosilicate at ambient temperature and pressure. We determined elemental composition, visualized morphology by microscopic techniques, and resolved mineral structure by solid-state 29Si and 27Al nuclear magnetic resonance and Fourier-transform infrared spectroscopy. Nitrogen sorption revealed substantial surface loss of Al-rich SROAS that resembled proto-imogolite formed in soils and sediments due to aggregation upon freezing. The effect was less pronounced in Si-rich SROAS, indicating a structure-dependent effect on spatial arrangement of mass at the submicron scale. Cryomilling efficiently fractured aggregates but did not change the magnitude of specific surface area. Since accessibility of surface functional groups is a prerequisite for sequestration of substances, elucidating physical and chemical processes of aggregation as a function of composition and crystallinity may improve our understanding of the reactivity of SROAS in the environment. |
| Databáze: | OpenAIRE |
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