Efficiency evaluation of thermally and chemically regenerated activated carbons used in a water cleaning system by acoustic emission analysis
Autor: | Harold Crespo Sariol, Willem Vercruysse, Liset Salomón García, Kenny Vanreppelen, Guy Reggers, Thayset Mariño Peacok, Robert Carleer, Angel Sánchez Roca, Dries Vandamme, Greet Cuyvers, Jan Yperman, Jeamichel Puente Torres, Grażyna Gryglewicz |
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Rok vydání: | 2020 |
Předmět: |
Fixed carbon
Materials science Mechanical Engineering Metal ions in aqueous solution 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Adsorption Acoustic emission Chemical engineering Mechanics of Materials Elemental analysis Thermal General Materials Science 0210 nano-technology Porosity |
Zdroj: | Journal of Porous Materials. 28:451-469 |
ISSN: | 1573-4854 1380-2224 |
Popis: | Acoustic emission analysis (AEA) results for textural characterization of granular activated carbons (GAC) can be related with its porosity. GACs were evaluated using this AEA technique by band-pass filtering from 3.5 to 50 kHz of the sound produced by flooding GAC with water. Used acoustic parameters for evaluation were: area under the signal envelope curve, acoustic energy and power. An exhausted GAC used in a water filter system of engine-based power plant was subjected to thermal and chemical regeneration under different conditions. Acoustic measurement results have been correlated with TGA, XRF, gas adsorption (N2 at 77 K), GAC stability and elemental analysis for assessing the AEA. Based on all these techniques, it was found that mainly metal ions were adsorbed on the GAC. It was found that chemical regeneration using a 2.4 N HCl solution was the most successful approach in removing the adsorbed metal ions: Ca, Mn and Ba. Using this HCl solution did have the additional benefit in keeping the amount of elemental and fixed carbon almost intact compared to the more diluted HCl solution of 0.6 N and 1.2 N. |
Databáze: | OpenAIRE |
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