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Transformation of boehmite into 2:1 type layered aluminosilicates with different layer charges under hydrothermal conditions
https://orcid.org/0000-0002-7057-7687
https://orcid.org/0000-0003-3041-7299
https://orcid.org/0000-0003-2924-9494
https://orcid.org/0000-0002-9002-4457
Abstract In this study, beidellite, paragonite and other 2:1 type layered aluminosilicates with high layer charges (2:1 type LA-HLC) were synthesized under hydrothermal conditions by using boehmite as a precursor. The concentrations of dissolved Al from boehmite precursor had important effects on the mineral components of the hydrothermal products and the layer charge density of the resultant minerals. A combination of 2:1 type LA-HLC, paragonite, and minor beidellite formed at a relatively high concentration of dissolved Al, while beidellite with a small amount of 2:1 type LA-HLC was produced at a low concentration of dissolved Al. The resultant 2:1 type LA-HLC exhibited poor swelling ability when treated with ethylene glycol. A solid-state transformation mechanism was proposed for the transformation based on the HRTEM images and EDS analyses, which showed that lattice fringes representing (001) faces of 2:1 type layered aluminosilicates (2:1 type LA) were parallel to the (020) direction of boehmite. The successful transformation of boehmite into 2:1 type LA provides insights to well understand the formation of 2:1 type LA in geological processes and offer a facile preparation approach for the synthesis of 2:1 type LA with different layer charges.
Highlights Boehmite could be transformed into 2:1 type layered aluminosilicates under hydrothermal conditions. 2:1 type layered aluminosilicates with high layer charges exhibited poorly swelling ability after ethylene glycol treatment. Layer charges of 2:1 type layered aluminosilicates were estimated based upon the 29Si NMR spectra results. Dissolved Al from boehmite had effects on the layer charge density of 2:1 type layered aluminosilicates.
Transformation of boehmite into 2:1 type layered aluminosilicates with different layer charges under hydrothermal conditions
https://orcid.org/0000-0002-7057-7687
https://orcid.org/0000-0003-3041-7299
https://orcid.org/0000-0003-2924-9494
https://orcid.org/0000-0002-9002-4457
Abstract In this study, beidellite, paragonite and other 2:1 type layered aluminosilicates with high layer charges (2:1 type LA-HLC) were synthesized under hydrothermal conditions by using boehmite as a precursor. The concentrations of dissolved Al from boehmite precursor had important effects on the mineral components of the hydrothermal products and the layer charge density of the resultant minerals. A combination of 2:1 type LA-HLC, paragonite, and minor beidellite formed at a relatively high concentration of dissolved Al, while beidellite with a small amount of 2:1 type LA-HLC was produced at a low concentration of dissolved Al. The resultant 2:1 type LA-HLC exhibited poor swelling ability when treated with ethylene glycol. A solid-state transformation mechanism was proposed for the transformation based on the HRTEM images and EDS analyses, which showed that lattice fringes representing (001) faces of 2:1 type layered aluminosilicates (2:1 type LA) were parallel to the (020) direction of boehmite. The successful transformation of boehmite into 2:1 type LA provides insights to well understand the formation of 2:1 type LA in geological processes and offer a facile preparation approach for the synthesis of 2:1 type LA with different layer charges.
Highlights Boehmite could be transformed into 2:1 type layered aluminosilicates under hydrothermal conditions. 2:1 type layered aluminosilicates with high layer charges exhibited poorly swelling ability after ethylene glycol treatment. Layer charges of 2:1 type layered aluminosilicates were estimated based upon the 29Si NMR spectra results. Dissolved Al from boehmite had effects on the layer charge density of 2:1 type layered aluminosilicates.
Transformation of boehmite into 2:1 type layered aluminosilicates with different layer charges under hydrothermal conditions
https://orcid.org/0000-0002-7057-7687
https://orcid.org/0000-0003-3041-7299
https://orcid.org/0000-0003-2924-9494
https://orcid.org/0000-0002-9002-4457
Abstract In this study, beidellite, paragonite and other 2:1 type layered aluminosilicates with high layer charges (2:1 type LA-HLC) were synthesized under hydrothermal conditions by using boehmite as a precursor. The concentrations of dissolved Al from boehmite precursor had important effects on the mineral components of the hydrothermal products and the layer charge density of the resultant minerals. A combination of 2:1 type LA-HLC, paragonite, and minor beidellite formed at a relatively high concentration of dissolved Al, while beidellite with a small amount of 2:1 type LA-HLC was produced at a low concentration of dissolved Al. The resultant 2:1 type LA-HLC exhibited poor swelling ability when treated with ethylene glycol. A solid-state transformation mechanism was proposed for the transformation based on the HRTEM images and EDS analyses, which showed that lattice fringes representing (001) faces of 2:1 type layered aluminosilicates (2:1 type LA) were parallel to the (020) direction of boehmite. The successful transformation of boehmite into 2:1 type LA provides insights to well understand the formation of 2:1 type LA in geological processes and offer a facile preparation approach for the synthesis of 2:1 type LA with different layer charges.
Highlights Boehmite could be transformed into 2:1 type layered aluminosilicates under hydrothermal conditions. 2:1 type layered aluminosilicates with high layer charges exhibited poorly swelling ability after ethylene glycol treatment. Layer charges of 2:1 type layered aluminosilicates were estimated based upon the 29Si NMR spectra results. Dissolved Al from boehmite had effects on the layer charge density of 2:1 type layered aluminosilicates.
Transformation of boehmite into 2:1 type layered aluminosilicates with different layer charges under hydrothermal conditions
Li, Shangying (author) / He, Hongping (author) / Tao, Qi (author) / Xi, Yunfei (author) / Chen, Aiqing (author) / Ji, Shichao (author) / Zhang, Chaoqun (author) / Yang, Yiping (author) / Zhu, Jianxi (author)
Applied Clay Science ; 181
2019-07-05
Article (Journal)
Electronic Resource
English
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