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Article

Alkali-Activated Zeolite 4A Granules—Characterization and Suitability Assessment for the Application of Adsorption

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Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, P. Valdena Street 3/7, LV-1048 Riga, Latvia
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Institute of Materials and Structures, Faculty of Civil Engineering, Riga Technical University, Kipsalas Street 6B, LV-1048 Riga, Latvia
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Water Research Laboratory, Faculty of Civil Engineering, Riga Technical University, P. Valdena Street 1, LV-1048 Riga, Latvia
*
Author to whom correspondence should be addressed.
Academic Editor: Leonid Kustov
Received: 9 February 2021 / Revised: 24 March 2021 / Accepted: 25 March 2021 / Published: 30 March 2021
(This article belongs to the Special Issue Crystalline Adsorbents—in Theory and Practice)
A major problem in the field of adsorbents is that binders (kaolin clay, bentonite) introduced to bind zeolites and ensure the needed mechanical strength, are not able to sorb gases like CO2 and N2, and decrease the overall adsorption capacity. To solve this problem, one of the pathways is to introduce a binder able to sorb such gases. Thus, in this study, the physical and mechanical properties of a novel binder based on metakaolin and its composite with zeolite 4A in the granular form were studied. Metakaolin was used as a precursor for alkali-activated binder, which was synthesized using an 8M NaOH activation solution. Raw materials were characterized using granulometry, X-ray diffraction (XRD), and differential thermal analysis (DTA); and final products were characterized using density measurements, a compressive strength test, XRD, Brunauer–Emmett–Teller (BET) analysis, and scanning electron microscopy (SEM). Alkali-activated metakaolin was found to be efficient as a binding material when data for morphological properties were analyzed. A relationship was observed—by increasing the liquid-to-solid ratio (L/S), compressive strength decreased. Zeolite granule attrition was higher than expected: 2.42% and 4.55% for ZG-0.8, 3.64% and 5.76% for ZG-1.0, and 2.73% and 4.85% for ZG-1.2, measured at 4 and 5 atmospheres, respectively. View Full-Text
Keywords: alkali-activated binder; metakaolin; zeolite 4A; zeolite granules alkali-activated binder; metakaolin; zeolite 4A; zeolite granules
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MDPI and ACS Style

Argalis, P.P.; Vitola, L.; Bajare, D.; Vegere, K. Alkali-Activated Zeolite 4A Granules—Characterization and Suitability Assessment for the Application of Adsorption. Crystals 2021, 11, 360. https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11040360

AMA Style

Argalis PP, Vitola L, Bajare D, Vegere K. Alkali-Activated Zeolite 4A Granules—Characterization and Suitability Assessment for the Application of Adsorption. Crystals. 2021; 11(4):360. https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11040360

Chicago/Turabian Style

Argalis, Pauls P., Laura Vitola, Diana Bajare, and Kristine Vegere. 2021. "Alkali-Activated Zeolite 4A Granules—Characterization and Suitability Assessment for the Application of Adsorption" Crystals 11, no. 4: 360. https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11040360

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