Effect on Si/Al ratio of Zeolite for the Removal of Calcium Ion in Aqueous Phase

May 31, 2023  |  Vol.9, No.5  |  PP. 579-588  | PDF

AUTHORS:

Hyeonsu Jeong, Department of Environmental Energy Engineering, Graduate School of Kyonggi University, Korea

Ye Hwan Lee, Department of Environmental Energy Engineering, Graduate School of Kyonggi University, Korea

Sung Su Kim, Department of Environmental Energy Engineering, Kyonggi University, Korea

KEYWORDS:

Zeolite, Si/Al ratio, Alumination, Calcium ion, Ion change

Abstract

Cement kiln dust (CKD) is a byproduct of cement production, which accounts for about 15-20% of cement production. Currently, CKD is being disposed of by incineration, but research on using CKD for carbon dioxide reduction is increasing. However, the major problem with this process is the presence of calcium ions in CKD. Trace amounts of calcium ions in a high concentration potassium chloride solution during the process can cause problems. In this study, we aimed to remove calcium ions in the solution using zeolite, an effective method for calcium ion removal. To enhance its performance, we modified 13X zeolite through alumination and dealumination methods to control the Si/Al ratio, and compared their calcium ion removal efficiency. Alumination (conditions: 70 ℃, 0.1 M NaAlO2) showed the best performance, with a calcium ion removal efficiency of 95.77%, which was about 6% higher than that of unmodified zeolite. On the other hand, the dealumination-modified zeolite showed a performance decrease of about 73% compared to unmodified zeolite. The structure, specific surface area, acidity, and Si/Al ratio of the modified zeolites were characterized by XRD, BET, FT-IR, and ICP analyses, and the Si/Al ratio was identified as the main factor affecting the calcium ion removal efficiency.

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Citations:

APA:
Jeong, H. S., Lee, Y. H., Kim, S. S. (2023). Effect on Si/Al ratio of Zeolite for the Removal of Calcium Ion in Aqueous Phase. Asia-pacific Journal of Convergent Research Interchange (APJCRI), ISSN: 2508-9080 (Print); 2671-5325 (Online), KCTRS, 9(5), 579-588. doi: 10.47116/apjcri.2023.05.48.

MLA:
Jeong, Hyeonsu, et al. “Effect on Si/Al ratio of Zeolite for the Removal of Calcium Ion in Aqueous Phase.” Asia-pacific Journal of Convergent Research Interchange, ISSN: 2508-9080 (Print); 2671-5325 (Online), KCTRS, vol. 9, no. 5, 2023, pp. 579-588. APJCRI, http://apjcriweb.org/content/vol9no5/48.html.

IEEE:
[1] H. S. Jeong, Y. H. Lee, S. S. Kim, “Effect on Si/Al ratio of Zeolite for the Removal of Calcium Ion in Aqueous Phase.” Asia-pacific Journal of Convergent Research Interchange (APJCRI), ISSN: 2508-9080 (Print); 2671-5325 (Online), KCTRS, vol. 9, no. 5, pp. 579-588, May 2023.