| Title |
Adsorption of phosphate ions by CSH (CaO/SiO2=1.5) adsorbent / |
| Authors |
Švedaitė, E ; Baltakys, K ; Dambrauskas, T |
| DOI |
10.15388/CCT.2023 |
| ISBN |
9786090708330 |
| Full Text |
|
| Is Part of |
Chemistry and chemical technology: international conference CCT-2023, March 10, 2023, Vilnius: conference book.. Vilnius : Vilnius university press, 2023. P 077, p. 114.. ISBN 9786090708330 |
| Abstract [eng] |
An excessive amount of phosphorus in surface water is one of the leading causes of eutrophication in many lakes and rivers in the world. Therefore, phosphate recovery is necessary to reduce environmental pollution and promote the sustainable use of phosphorus resources. Various methods have been developed to reduce phosphate ions concentration in water [1]. One of the promising technologies for phosphorus removal and recovery is adsorption because it offers high flexibility. Calcium-rich materials are found to be the most promising and widely accepted sorbents for phosphorus removal [2]. This study aims to investigate the adsorption process of phosphate ions in KH2PO4 solution by using a hydrothermally synthesized CSH (CaO/SiO2=1.5). In this work, the adsorbent was synthesized in a mixture of CaO and polonite (CaO/SiO2 molar ratio 1.5) under hydrothermal conditions (16 h, 200 °C). Adsorption experiments were carried out at 25 °C temperature in a thermostatic absorber by stirring 10 g of synthetic adsorbent in 1000 mL of KH2PO4 solution containing 7.8 g/dm3 of phosphate ions. pH value of primary solution is equal to 4.5. The results of the adsorption experiments revealed that more than 10% PO4 2– ions (7.1 mg PO4 2-/g) were adsorbed within first seconds (30 s). It should be noted that the adsorption proceeded intensively until 30 min because the amount of adsorbed PO4 2– ions significantly increased (44.4 mg PO4 2-/g) (Figure 1, b). Later, the concentration of the PO4 2– ions decreases steadily in the solution (Figure 1, a). It was determined, that at the end of experiment (7 days) the amount of adsorbed phosphate ions was equal to 75.5 mg PO4 2-/g, i.e. the removal efficiency of phosphates achieved 94.9%. [...]. |
| Published |
Vilnius : Vilnius university press, 2023 |
| Type |
Conference paper |
| Language |
English |
| Publication date |
2023 |
| CC license |
|
