| Title |
Effect of temperature and P5+ ions concentration on the phosphorus adsorption mechanism by synthetic calcium silicate hydrates |
| Authors |
Svedaite, Evelina ; Baltakys, Kestutis ; Levisauskas, Donatas ; Galvanauskas, Vytautas ; Dambrauskas, Tadas |
| DOI |
10.1016/j.hazadv.2026.101159 |
| Full Text |
|
| Is Part of |
Journal of hazardous materials advances.. Amsterdam : Elsevier. 2026, vol. 22, art. no. 101159, p. 1-15.. ISSN 2772-4166 |
| Keywords [eng] |
Adsorption ; Calcium silicate hydrate ; Hydrothermal synthesis ; Kinetics ; Phosphorus |
| Abstract [eng] |
Efficient treatment of phosphorus-rich wastewater is crucial for protecting the ecosystem. Several methods have been developed for removing phosphates from aqueous solutions, with adsorption technology among the most effective. The main objective of this work was to synthesize an adsorbent based on calcium silicate hydrates and apply it for the adsorption of phosphate ions. The adsorbent was synthesized from a mixture of CaO and natural opoka under hydrothermal synthesis conditions (16 h, 200 °C). Batch adsorption experiments were carried out at 25, 35, and 45 °C in a thermostatic absorber by stirring 10 g of synthesized adsorbent in 1 L of KH2PO4 solution containing 0.2–5 g P5+/L. The adsorption lasted up to 168 h. It was determined that during adsorption, calcium and phosphorus ions interact strongly, leading to the formation of hydroxyapatite and brushite. The adsorbent can adsorb up to 210 mg P5+/g, depending on the adsorption conditions, including adsorption temperature and initial phosphorus content. Adsorption mechanisms were characterized using an adsorption kinetic model and isotherms. The optimal phosphorus uptake rate was calculated using the response surface model. |
| Published |
Amsterdam : Elsevier |
| Type |
Journal article |
| Language |
English |
| Publication date |
2026 |
| CC license |
|
