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Roy S, Dürholt JP, Asche TS, Zipoli F, Gómez-Bombarelli R. Learning a reactive potential for silica-water through uncertainty attribution. Nat Commun 2024; 15:6030. [PMID: 39019930 PMCID: PMC11254924 DOI: 10.1038/s41467-024-50407-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 07/03/2024] [Indexed: 07/19/2024] Open
Abstract
The reactivity of silicates in aqueous solution is relevant to various chemistries ranging from silicate minerals in geology, to the C-S-H phase in cement, nanoporous zeolite catalysts, or highly porous precipitated silica. While simulations of chemical reactions can provide insight at the molecular level, balancing accuracy and scale in reactive simulations in the condensed phase is a challenge. Here, we demonstrate how a machine-learning reactive interatomic potential trained on PaiNN architecture can accurately capture silicate-water reactivity. The model was trained on a dataset comprising 400,000 energies and forces of molecular clusters at the ωB97X-D3/def2-TZVP level. To ensure the robustness of the model, we introduce a general active learning strategy based on the attribution of the model uncertainty, that automatically isolates uncertain regions of bulk simulations to be calculated as small-sized clusters. The potential reproduces static and dynamic properties of liquid water and solid crystalline silicates, despite having been trained exclusively on cluster data. Furthermore, we utilize enhanced sampling simulations to recover the self-ionization reactivity of water accurately, and the acidity of silicate oligomers, and lastly study the silicate dimerization reaction in a water solution at neutral conditions and find that the reaction occurs through a flanking mechanism.
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Affiliation(s)
- Swagata Roy
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | - Thomas S Asche
- Evonik Operations GmbH, Essen, North Rhine-Westphalia, Germany
| | - Federico Zipoli
- IBM Research Europe, Saümerstrasse 4, 8803, Rüschlikon, Switzerland
| | - Rafael Gómez-Bombarelli
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
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Auyeshov A, Arynov K, Yeskibayeva C, Dikanbayeva A, Auyeshov D, Raiymbekov Y. Transformation of Silicate Ions into Silica under the Influence of Acid on the Structure of Serpentinite. Molecules 2024; 29:2502. [PMID: 38893379 PMCID: PMC11173597 DOI: 10.3390/molecules29112502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 05/14/2024] [Accepted: 05/15/2024] [Indexed: 06/21/2024] Open
Abstract
The process of transformation of the silicate components of the crystal lattice structure of chrysotile during its quantitative interaction with aqueous solutions containing various stoichiometrically required amounts of sulfuric acid (SRA H2SO4) calculated with respect to the magnesium content in the composition of chrysotile is investigated. It has been shown by IR spectroscopic, X-ray phase, thermal and chemical methods of investigation and analysis that, with quantitative interactions of chrysotile and sulfuric acid, first of all, the "brucite layer" of the molecular structural structure of chrysotile is exposed to acid at SRA H2SO4 = 0.1-0.3. As a result of ion exchange processes, acidic silanol (≡Si-O-H) or disilanol (=Si=(O-H)2) bonds are formed. These acid groups form one-dimensional silicate chains with transverse bridges (≡Si-O-Si≡), where the angles (Si-O-Si = 180 °C) straighten, which are recorded in the IR spectra in the region of characteristic absorption of 1220-1250 cm-1 silica. The association of the resulting acid groups into silicate chains, dimers, and trimers with transverse bridges, leads to the appearance of colloidal silica particles in the system, which cause some inhibition of the dissolution of layered magnesium hydrosilicate in sulfuric acid solutions containing H2SO4 ˃ 0.3 SRA.
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Affiliation(s)
- Abdrazak Auyeshov
- High School of Chemical Engineering and Biotechnology, M. Auezov South Kazakhstan University, Shymkent 160000, Kazakhstan; (C.Y.); (A.D.); (D.A.); (Y.R.)
| | | | - Chaizada Yeskibayeva
- High School of Chemical Engineering and Biotechnology, M. Auezov South Kazakhstan University, Shymkent 160000, Kazakhstan; (C.Y.); (A.D.); (D.A.); (Y.R.)
| | - Aizhan Dikanbayeva
- High School of Chemical Engineering and Biotechnology, M. Auezov South Kazakhstan University, Shymkent 160000, Kazakhstan; (C.Y.); (A.D.); (D.A.); (Y.R.)
| | - Darkhan Auyeshov
- High School of Chemical Engineering and Biotechnology, M. Auezov South Kazakhstan University, Shymkent 160000, Kazakhstan; (C.Y.); (A.D.); (D.A.); (Y.R.)
| | - Yerkebulan Raiymbekov
- High School of Chemical Engineering and Biotechnology, M. Auezov South Kazakhstan University, Shymkent 160000, Kazakhstan; (C.Y.); (A.D.); (D.A.); (Y.R.)
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Awad MA, Hendi AA, Ortashi KMO, Alnamlah RA, Alangery A, Ali Alshaya E, Alshammari SG. Utilizing Cymbopogon Proximus Grass Extract for Green Synthesis of Zinc Oxide Nanorod Needles in Dye Degradation Studies. Molecules 2024; 29:355. [PMID: 38257268 PMCID: PMC10820172 DOI: 10.3390/molecules29020355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 12/31/2023] [Accepted: 01/03/2024] [Indexed: 01/24/2024] Open
Abstract
This study successfully synthesized zinc oxide nanorod needles (ZnO-NRNs) using an environmentally friendly method employing Cymbopogon Proximus extract. The resulting ZnO-NRNs exhibited exceptional physicochemical and structural properties, confirmed through various characterization techniques, including UV-Vis spectrophotometry, dynamic light scattering (DLS), transmission electron microscopy (TEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDX). The analysis revealed a hexagonal wurtzite structure with high crystallinity, a 3.6 eV band gap, and a notably blue-shifted absorption band. ZnO-NRNs showed impressive photocatalytic activity, degrading Rhodamine B dye by 97% under UV and visible sunlight, highlighting their photostability and reusability. This green synthesis process offers cost effectiveness and environmental sustainability for practical applications.
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Affiliation(s)
- Manal A. Awad
- King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia;
| | - Awatif A. Hendi
- Department of Physics and Astronomy, College of Sciences, King Saud University, P.O. Box 22452, Riyadh 11459, Saudi Arabia; (A.A.H.); (R.A.A.)
| | - Khalid M. O. Ortashi
- Department of Chemical Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;
| | - Reema A. Alnamlah
- Department of Physics and Astronomy, College of Sciences, King Saud University, P.O. Box 22452, Riyadh 11459, Saudi Arabia; (A.A.H.); (R.A.A.)
| | - Asma Alangery
- Department of Chemistry, College of Sciences, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; (A.A.); (S.G.A.)
| | - Eman Ali Alshaya
- King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia;
| | - Saad G. Alshammari
- Department of Chemistry, College of Sciences, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; (A.A.); (S.G.A.)
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Hani A, Meftah N, Zeghoud L, Sdiri A, Jawad AH. Statistical Optimization and Desirability Function for Producing Nano Silica from Dune Sand by Sol–gel Method Towards Methylene Blue Dye Removal. J Inorg Organomet Polym Mater 2023. [DOI: 10.1007/s10904-023-02612-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
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Kremer D, Strunge T, Skocek J, Schabel S, Kostka M, Hopmann C, Wotruba H. Separation of reaction products from ex-situ mineral carbonation and utilization as a substitute in cement, paper, and rubber applications. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ex-situ mineral carbonation – A parameter study on carbon mineralisation in an autoclave as part of a large-scale utilisation process. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.101928] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Muhammud AM, Gupta NK. Nanostructured SiO 2 material: synthesis advances and applications in rubber reinforcement. RSC Adv 2022; 12:18524-18546. [PMID: 35799930 PMCID: PMC9218877 DOI: 10.1039/d2ra02747j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 05/31/2022] [Indexed: 11/21/2022] Open
Abstract
Silica is a commercially significant material due to its extensive use in widespread applications and products. Synthetic amorphous silica (SAS) is a form of SiO2 that is intentionally manufactured and has been produced and marketed for decades without significant changes in its physico-chemical properties. The industrial production of nanostructured SiO2 is nowadays challenged by the expensive raw material use and high energy consumption. The search for non-petroleum-based fillers such as nanostructured SiO2, which are environmentally friendly, cheap, abundant, renewable, and efficient, has been initiated nowadays. Therefore, a large number of research activities have been carried out so far for the preparation of SAS from potential alternate precursors, i.e., synthetic chemicals, biogenic, and mineral ore resources. Reinforcement of rubbers with nanostructured SiO2 fillers is a process of great practical and technological importance for improving their mechanical, dynamic, and thermal properties. The efficiencies of SiO2 reinforcement correlate with different factors such as filler structure, surface area, rubber–filler interactions, and filler–filler interactions with their effects. This review paper discusses the recent synthesis advances of nanostructured SiO2 from synthetic chemicals, biogenic and mineral ore resources, their physical characteristics, and applications in rubber reinforcement, overcoming challenges. Finally, summary and future work recommendations have been mentioned well for future researchers. This review discusses recent advances in the synthesis of nanostructured SiO2 from synthetic chemicals, and biogenic and mineral ore resources, its physical characteristics, and its applications in rubber reinforcement.![]()
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Affiliation(s)
- Agraw Mulat Muhammud
- Department of Applied Chemistry, Adama Science and Technology University, Ethiopia
| | - Neeraj Kumar Gupta
- Department of Applied Chemistry, Adama Science and Technology University, Ethiopia
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Separation of Products from Mineral Sequestration of CO2 with Primary and Secondary Raw Materials. MINERALS 2020. [DOI: 10.3390/min10121098] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Rising levels of greenhouse gases (GHG) in our atmosphere make it necessary to find pathways to reduce the amount of GHG, especially emissions of CO2. One approach is carbon capture and utilization by mineralization (CCUM). With this technology, it is possible to bind CO2 chemically from exhaust gas streams in magnesium or calcium silicates. Stable products of this exothermic reaction are carbonates and amorphous silica. Being amongst the biggest emitters of CO2, the cement industry has to find ways to reduce emissions. Geological mapping in Europe has been carried out to find suitable feedstock material, mainly olivines but also slags, to perform lab‑scale carbonation tests. These tests, conducted in a 1.5 L autoclave with increased pressure and temperature, have been scaled up to a 10 L and a 1000 L autoclave. The outcomes of the carbonation are unreacted feed material, carbonate, and amorphous silica, which have to be separated to produce substitutes for the cement industry as pozzolanic material (amorphous silica) or a value‑added product for other applications like paper or plastics (magnesite/calcite with bound anthropogenic CO2). Therefore, a process for the separation of ultrafine carbonation product was developed, consisting mainly of classification and flotation.
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