Structural and chemical properties of thermally treated geopolymer samples
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2017
Authors
Kljajević, Ljiljana M.
Nenadović, Snežana S.

Nenadović, Miloš T.
Bundaleski, Nenad K.

Todorović, Bratislav Ž.
Pavlović, Vladimir B.

Rakočević, Zlatko

Article (Published version)

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This article presents the results of the compositional, structural and morphological study of geopolymers synthesized from metakaolin and an alkali activator. The study involved the investigation of the structural and chemical properties of the geopolymer, in addition to thermally treated geopolymers up to 600 and 900 °C. The precursor of the geopolymer, and the geopolymer samples before and after the thermal treatment, were investigated by Fourier transformation infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and SEM analysis. The corrected average value of the ratio of silicon and aluminum in the geopolymer samples (SiGP:Al) is about 1.46, which suggests that the obtained geopolymer samples represent a mixture of roughly equal amounts of sialate and sialate-siloxo units. Annealing the geopolymer samples at 600 °C decreases the amount of Si-ONa bonds and induces the cross-linking of polymer changes. At the same time, other sodium containin...g alumino-silicate phases are created. The thermal treatment at 900 °C leads to a considerable reduction of oxygen and particularly sodium, followed by significant morphological changes i.e. formation of a complex porous structure. Additionally, a new semicrystaline phase appears. Both XRD and XPS results imply that this new phase may be nepheline and it is plausible that this phase begins to nucleate at temperatures below 900 °C.
Keywords:
Mixing / Surfaces / Chemical properties / Clay / Structural applicationsSource:
Ceramics International, 2017, 43, 9, 6700-6708Publisher:
- Elsevier
Funding / projects:
- Synthesis, processing and characterization of nanostructured materials for application in the field of energy, mechanical engineering, environmental protection and biomedicine (RS-45012)
- Functional, Functionalized and Advanced Nanomaterials (RS-45005)
- COST Action CM1302 - European Network on Smart Inorganic Polymers (SIPs)
DOI: 10.1016/j.ceramint.2017.02.066
ISSN: 0272-8842
WoS: 000401401800009
Scopus: 2-s2.0-85013638085
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - JOUR AU - Kljajević, Ljiljana M. AU - Nenadović, Snežana S. AU - Nenadović, Miloš T. AU - Bundaleski, Nenad K. AU - Todorović, Bratislav Ž. AU - Pavlović, Vladimir B. AU - Rakočević, Zlatko PY - 2017 UR - https://dais.sanu.ac.rs/123456789/2374 AB - This article presents the results of the compositional, structural and morphological study of geopolymers synthesized from metakaolin and an alkali activator. The study involved the investigation of the structural and chemical properties of the geopolymer, in addition to thermally treated geopolymers up to 600 and 900 °C. The precursor of the geopolymer, and the geopolymer samples before and after the thermal treatment, were investigated by Fourier transformation infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and SEM analysis. The corrected average value of the ratio of silicon and aluminum in the geopolymer samples (SiGP:Al) is about 1.46, which suggests that the obtained geopolymer samples represent a mixture of roughly equal amounts of sialate and sialate-siloxo units. Annealing the geopolymer samples at 600 °C decreases the amount of Si-ONa bonds and induces the cross-linking of polymer changes. At the same time, other sodium containing alumino-silicate phases are created. The thermal treatment at 900 °C leads to a considerable reduction of oxygen and particularly sodium, followed by significant morphological changes i.e. formation of a complex porous structure. Additionally, a new semicrystaline phase appears. Both XRD and XPS results imply that this new phase may be nepheline and it is plausible that this phase begins to nucleate at temperatures below 900 °C. PB - Elsevier T2 - Ceramics International T1 - Structural and chemical properties of thermally treated geopolymer samples SP - 6700 SP - 6700 EP - 6708 EP - 6708 VL - 43 VL - 43 IS - 9 IS - 9 DO - 10.1016/j.ceramint.2017.02.066 UR - https://hdl.handle.net/21.15107/rcub_dais_2374 ER -
@article{ author = "Kljajević, Ljiljana M. and Nenadović, Snežana S. and Nenadović, Miloš T. and Bundaleski, Nenad K. and Todorović, Bratislav Ž. and Pavlović, Vladimir B. and Rakočević, Zlatko", year = "2017", abstract = "This article presents the results of the compositional, structural and morphological study of geopolymers synthesized from metakaolin and an alkali activator. The study involved the investigation of the structural and chemical properties of the geopolymer, in addition to thermally treated geopolymers up to 600 and 900 °C. The precursor of the geopolymer, and the geopolymer samples before and after the thermal treatment, were investigated by Fourier transformation infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and SEM analysis. The corrected average value of the ratio of silicon and aluminum in the geopolymer samples (SiGP:Al) is about 1.46, which suggests that the obtained geopolymer samples represent a mixture of roughly equal amounts of sialate and sialate-siloxo units. Annealing the geopolymer samples at 600 °C decreases the amount of Si-ONa bonds and induces the cross-linking of polymer changes. At the same time, other sodium containing alumino-silicate phases are created. The thermal treatment at 900 °C leads to a considerable reduction of oxygen and particularly sodium, followed by significant morphological changes i.e. formation of a complex porous structure. Additionally, a new semicrystaline phase appears. Both XRD and XPS results imply that this new phase may be nepheline and it is plausible that this phase begins to nucleate at temperatures below 900 °C.", publisher = "Elsevier", journal = "Ceramics International", title = "Structural and chemical properties of thermally treated geopolymer samples", pages = "6700-6700-6708-6708", volume = "43, 43", number = "9, 9", doi = "10.1016/j.ceramint.2017.02.066", url = "https://hdl.handle.net/21.15107/rcub_dais_2374" }
Kljajević, L. M., Nenadović, S. S., Nenadović, M. T., Bundaleski, N. K., Todorović, B. Ž., Pavlović, V. B.,& Rakočević, Z.. (2017). Structural and chemical properties of thermally treated geopolymer samples. in Ceramics International Elsevier., 43(9), 6700-6708. https://doi.org/10.1016/j.ceramint.2017.02.066 https://hdl.handle.net/21.15107/rcub_dais_2374
Kljajević LM, Nenadović SS, Nenadović MT, Bundaleski NK, Todorović BŽ, Pavlović VB, Rakočević Z. Structural and chemical properties of thermally treated geopolymer samples. in Ceramics International. 2017;43(9):6700-6708. doi:10.1016/j.ceramint.2017.02.066 https://hdl.handle.net/21.15107/rcub_dais_2374 .
Kljajević, Ljiljana M., Nenadović, Snežana S., Nenadović, Miloš T., Bundaleski, Nenad K., Todorović, Bratislav Ž., Pavlović, Vladimir B., Rakočević, Zlatko, "Structural and chemical properties of thermally treated geopolymer samples" in Ceramics International, 43, no. 9 (2017):6700-6708, https://doi.org/10.1016/j.ceramint.2017.02.066 ., https://hdl.handle.net/21.15107/rcub_dais_2374 .