Effect of K₂O Contents on the Releasing of Nutrient Ions from Phosphate Glass System

Abstract:

Currently, the solubility of phosphate glasses has been extensively studied for potential glass fertilizer. This work presents the study of 45P₂O₅-20CaO-xK₂O-(29-x)Na₂O-6Al₂O₃ glass_, where x equals to 5, 10, 15 and 20 wt. % of K₂O. Free bubble glasses were obtained at melting temperature of 1300 °C. Solubility study of phosphate glass indicates that the glass containing 15 wt. % of K₂O released the highest amounts of PO₄^3- ion and K⁺ ion and it exhibits the lowest pH value compare to other glasses. Spectroscopy analysis revealed the addition of K₂O to the glass system contributed to the formation of metaphosphate and phyrophosphate units around 919 cm^-1 and 1119 cm^-1. The morphology analysis indicates the formation of pores on the glass surface was associated with the corrosion of the glass samples due to the immersion. The addition of K₂O to the glass system has increased the glass solubility due to the breakup of the glass structure.

• Periodical: Key Engineering Materials (Volume 723)
• Pages: 545-550
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.723.545
• Online since: December 2016
• Authors: Siti Hafizah Mohamad, Mohd Al Amin Muhamad Nor*
• Keywords: Ion Released, Phosphate Glass, Potassium Oxide

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