Preparation of phosphate-based geopolymer from calcined bentonite

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F25%3A00390097" target="_blank" >RIV/68407700:21110/25:00390097 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1088/1742-6596/3146/1/012028" target="_blank" >http://dx.doi.org/10.1088/1742-6596/3146/1/012028</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1742-6596/3146/1/012028" target="_blank" >10.1088/1742-6596/3146/1/012028</a>

Result language
angličtina
Original language name
Preparation of phosphate-based geopolymer from calcined bentonite
Original language description
Acid based geopolymers (ABG) are less known counterpart to alkali-activated materials. Usually, metakaolin is activated by phosphoric acid to “acid geopolymer” or “phosphate geopolymer”. These materials are studied since their potential high thermal and chemical stability. Unfortunately, ABG prepared from metakaolin requires thermal treatment at 60 °C to become solid since the activation reaction kinetics is highly dependent on the temperature. Moreover, the sources of kaolin are rather limited. For that reasons, alternative aluminosilicate precursors deserve the attention. Bentonite is quite common rock composed mostly from montmorillonite. In this study, thermally (650 °C) activated bentonite was used as precursor for acid activation. The precursor was activated by phosphoric acid in amount adjusted to prepare samples with Al/P molar ratio between 1 and 2. The relatively best compressive strength reached sample with Al/P 1.5. However, the achieved strength was low compared to acid activated metakaolin.
Czech name
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Czech description
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Project
<a href="/en/project/GA24-11171S" target="_blank" >GA24-11171S: Acid-activated geopolymers based on clay precursors: preparation, structure, environmental assessment</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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