Metakaolin-based geopolymers filled with volcanic fly ashes: FT-IR, thermal characterization, and antibacterial property
In countries where volcanic activity is widespread, fly ash (FA) formation can represent both a waste to be disposed of and a resource of inorganic substances that can be utilized. Among the technologies able to incorporate FA, geopolymers (GP) or inorganic aluminosilicate amorphous materials are ve...
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| Format: | Article |
| Language: | English |
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De Gruyter
2023-03-01
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| Series: | Science and Engineering of Composite Materials |
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| Online Access: | https://doi.org/10.1515/secm-2022-0192 |
| _version_ | 1797848670660460544 |
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| author | Blanco Ignazio D’Angelo Antonio Viola Veronica Vertuccio Luigi Catauro Michelina |
| author_facet | Blanco Ignazio D’Angelo Antonio Viola Veronica Vertuccio Luigi Catauro Michelina |
| author_sort | Blanco Ignazio |
| collection | DOAJ |
| description | In countries where volcanic activity is widespread, fly ash (FA) formation can represent both a waste to be disposed of and a resource of inorganic substances that can be utilized. Among the technologies able to incorporate FA, geopolymers (GP) or inorganic aluminosilicate amorphous materials are very suitable for this purpose. In this study, GP are realized using metakaolin (MK), sodium hydroxide solution (NaOH 8 M), sodium silicate solution (Na2SiO3), and FA as filler (20 wt% with respect to MK content). The samples were cured at 25 or 40°C for 24 h and the physicochemical, thermal, and antibacterial properties of this material through the integrity test, weight loss test, Fourier-transform infra-red spectroscopy (FT-IR), thermogravimetric analysis (TGA), and Kirby-Bauer assay were assessed. Integrity and weight loss tests indirectly revealed the stability of the macroscopic 3D networks and that the curing at 40°C led to more stable GP. The shift of the Si–O–T absorption band (from 1,090 cm−1 of the MK to 1,017–1,012 cm−1 of the specimens with and without FA) in FT-IR spectra suggested the occurrence of the geopolymerizazion reactions, while TGA study confirmed the higher stability of samples cured at 40°C (with a mass loss equal to 7–13% at 800°C under nitrogen atmosphere). Finally, the antimicrobial activity shed light on the ability of the synthesized GP with the filler and treated at 40°C to have a great effect against Escherichia coli and Pseudomonas aeruginosa. |
| first_indexed | 2024-04-09T18:31:18Z |
| format | Article |
| id | doaj.art-cdf392eb98fc483fb750a268592d2e3c |
| institution | Directory Open Access Journal |
| issn | 2191-0359 |
| language | English |
| last_indexed | 2024-04-09T18:31:18Z |
| publishDate | 2023-03-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Science and Engineering of Composite Materials |
| spelling | doaj.art-cdf392eb98fc483fb750a268592d2e3c2023-04-11T17:07:19ZengDe GruyterScience and Engineering of Composite Materials2191-03592023-03-01301512810.1515/secm-2022-0192Metakaolin-based geopolymers filled with volcanic fly ashes: FT-IR, thermal characterization, and antibacterial propertyBlanco Ignazio0D’Angelo Antonio1Viola Veronica2Vertuccio Luigi3Catauro Michelina4Department of Civil Engineering and Architecture and INSTM UdR, University of Catania, Viale A. Doria 6, 95125 Catania, ItalyDepartment of Engineering, University of Campania “Luigi Vanvitelli”, Via Roma n. 29, 81031 Aversa, ItalyDepartment of Engineering, University of Campania “Luigi Vanvitelli”, Via Roma n. 29, 81031 Aversa, ItalyDepartment of Engineering, University of Campania “Luigi Vanvitelli”, Via Roma n. 29, 81031 Aversa, ItalyDepartment of Engineering, University of Campania “Luigi Vanvitelli”, Via Roma n. 29, 81031 Aversa, ItalyIn countries where volcanic activity is widespread, fly ash (FA) formation can represent both a waste to be disposed of and a resource of inorganic substances that can be utilized. Among the technologies able to incorporate FA, geopolymers (GP) or inorganic aluminosilicate amorphous materials are very suitable for this purpose. In this study, GP are realized using metakaolin (MK), sodium hydroxide solution (NaOH 8 M), sodium silicate solution (Na2SiO3), and FA as filler (20 wt% with respect to MK content). The samples were cured at 25 or 40°C for 24 h and the physicochemical, thermal, and antibacterial properties of this material through the integrity test, weight loss test, Fourier-transform infra-red spectroscopy (FT-IR), thermogravimetric analysis (TGA), and Kirby-Bauer assay were assessed. Integrity and weight loss tests indirectly revealed the stability of the macroscopic 3D networks and that the curing at 40°C led to more stable GP. The shift of the Si–O–T absorption band (from 1,090 cm−1 of the MK to 1,017–1,012 cm−1 of the specimens with and without FA) in FT-IR spectra suggested the occurrence of the geopolymerizazion reactions, while TGA study confirmed the higher stability of samples cured at 40°C (with a mass loss equal to 7–13% at 800°C under nitrogen atmosphere). Finally, the antimicrobial activity shed light on the ability of the synthesized GP with the filler and treated at 40°C to have a great effect against Escherichia coli and Pseudomonas aeruginosa.https://doi.org/10.1515/secm-2022-0192geopolymervolcanic ashantibacterial propertiesthermal analysisft-ir |
| spellingShingle | Blanco Ignazio D’Angelo Antonio Viola Veronica Vertuccio Luigi Catauro Michelina Metakaolin-based geopolymers filled with volcanic fly ashes: FT-IR, thermal characterization, and antibacterial property Science and Engineering of Composite Materials geopolymer volcanic ash antibacterial properties thermal analysis ft-ir |
| title | Metakaolin-based geopolymers filled with volcanic fly ashes: FT-IR, thermal characterization, and antibacterial property |
| title_full | Metakaolin-based geopolymers filled with volcanic fly ashes: FT-IR, thermal characterization, and antibacterial property |
| title_fullStr | Metakaolin-based geopolymers filled with volcanic fly ashes: FT-IR, thermal characterization, and antibacterial property |
| title_full_unstemmed | Metakaolin-based geopolymers filled with volcanic fly ashes: FT-IR, thermal characterization, and antibacterial property |
| title_short | Metakaolin-based geopolymers filled with volcanic fly ashes: FT-IR, thermal characterization, and antibacterial property |
| title_sort | metakaolin based geopolymers filled with volcanic fly ashes ft ir thermal characterization and antibacterial property |
| topic | geopolymer volcanic ash antibacterial properties thermal analysis ft-ir |
| url | https://doi.org/10.1515/secm-2022-0192 |
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