Selective Chemical Filters for VOF3: Tailoring MgF2 Filter Selectivity through Surface Chemistry
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Filtering Capacities
2.3. Fluorination
2.4. Characterization
2.4.1. X-ray Powder Diffraction
2.4.2. Adsorption/Desorption Isotherms
2.4.3. Raman Spectroscopy
2.4.4. NMR Spectroscopy
3. Results and Discussion
3.1. Fluorination to Tailor OH/F Ratio in MgF2−x(OH)x
3.1.1. Conversion of MgB2 into Oxygen-Free MgF2
- The expected pore size, in accordance with the size of the released molecules (0.243, 0.320, 0.377 and 0.377 nm) for MgB2 (BF3), Mg3N2 (NF3), Mg2Si (SiF4) and Mg3P2 (PF5), respectively.
- The toxicity of the gases released at the completion of the first reaction item.
- The presence of solid products other than MgF2.
3.1.2. Tailoring of OH/F Ratio in Conventional MgF2
3.2. Sorption of VOF3 in MgF2−x(OH)x
3.3. Regeneration of the Chemical Filter
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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MgF2 Treatment | Bulk Weight Uptake (%) | Vanadium Weight Uptake (%) | Vanadium ICP Analysis (%) |
---|---|---|---|
Raw | 8.7 | 3.6 | 3.4 |
Post-fluorinated at 240 °C | 5.1 | 2.1 | 2.0 |
Synthesized from MgB2 | 3.1 | 1.3 | 1.2 |
Process Step | Starting Material | After Filtering | After NaOH Regeneration | |
---|---|---|---|---|
SSABET (m²·g−1) | First run | 72 | 37 | 64 |
Second run | 64 | 38 | 51 |
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Jouffret, L.; Hiltbrunner, J.-M.; Petit, E.; Selmi, A.; Morel, B.; Dubois, M. Selective Chemical Filters for VOF3: Tailoring MgF2 Filter Selectivity through Surface Chemistry. Surfaces 2023, 6, 480-492. https://doi.org/10.3390/surfaces6040032
Jouffret L, Hiltbrunner J-M, Petit E, Selmi A, Morel B, Dubois M. Selective Chemical Filters for VOF3: Tailoring MgF2 Filter Selectivity through Surface Chemistry. Surfaces. 2023; 6(4):480-492. https://doi.org/10.3390/surfaces6040032
Chicago/Turabian StyleJouffret, Laurent, Jean-Michel Hiltbrunner, Elodie Petit, Ania Selmi, Bertrand Morel, and Marc Dubois. 2023. "Selective Chemical Filters for VOF3: Tailoring MgF2 Filter Selectivity through Surface Chemistry" Surfaces 6, no. 4: 480-492. https://doi.org/10.3390/surfaces6040032