*Member, The American Ceramic Society.
Removal of Calcium Ions from Aqueous Solution by Phosphosilicate Glass
Article first published online: 1 SEP 2010
© 2010 The American Ceramic Society
Journal of the American Ceramic Society
Volume 94, Issue 1, pages 124–129, January 2011
How to Cite
Nam, J.-S., Baek, I.-H. and Kim, C. Y. (2011), Removal of Calcium Ions from Aqueous Solution by Phosphosilicate Glass. Journal of the American Ceramic Society, 94: 124–129. doi: 10.1111/j.1551-2916.2010.04018.x
P. Brown—contributing editor
This work was supported by the Korea Ministry of Environment as “The Eco-technopia 21 project” (Grant No. 2008-02002-0032-0).
- Issue published online: 5 JAN 2011
- Article first published online: 1 SEP 2010
- Manuscript No. 27469. Received February 9, 2010; approved June 30, 2010.
Water containing calcium ions often leads to scaling problems in hot-water pipes, heaters, and boilers. The building up of this scale deposit is a common and costly problem in many industrial processes. Recently, glasses with a special composition have shown the ability to remove some hazardous ions from waste solutions. In the present study, a 45SiO2–4P2O5–16B2O3–20Na2O–15K2O glass system was used to remove calcium ions from an aqueous solution. When this phosphosilicate glass was reacted in a solution containing calcium ions, the calcium ions were eliminated by forming calcium phosphate crystals on the glass surface. For this calcium removal process to occur, phosphorus ions must be supplied from the glass through ion leaching. Reaction under a dynamic condition and an increased surface area of the glass enhanced the removal rate of calcium ions from the solution. The calcium ion removal efficiency was also increased by the crystallization of the glass.