Table 5 Preparation of different MMF samples.
From: Investigation on the adsorption of phosphorus in all fractions from sediment by modified maifanite
Modification methods | Preparation of MMF samples |
|---|---|
Acidification | Firstly, the RMF granules were mixed at 90 °C for 2 h with 0.5, 1.0, 1.25, 1.5, 2.0, and 2.5 mol/L H2SO4 solution, respectively, at liquid/solid of 3 mL/g in the thermostatic water bath. The samples were then washed by deionized water until the pH value reached 7.0. After that, the obtained granules were dried at 105 °C for 24 h. Finally, the acidification MMF samples were cooled to room temperature for further studies. The acidification MMF samples were named as MMF-H0.5, MMF-H1.0, MMF-H1.25, MMF-H2.0, and MMF-H2.5, respectively. |
Alkalization | Firstly, the RMF granules were mixed at 90 °C for 2 h with 0.5, 1.0, 2.0, 3.0, 4.0, and 5.0 mol/L NaOH solution, respectively, at liquid/solid of 3 mL/g in the thermostatic water bath. The samples were then washed by deionized water until the pH value reached 7.0. After that, the obtained granules were dried at 105 °C for 24 h. Finally, the alkalization MMF samples were cooled to room temperature for further studies. The alkalization MMF samples were named as MMF-OH0.5, MMF-OH1.0, MMF-OH2.0, MMF-OH3.0, MMF-OH4.0, and MMF-OH5.0, respectively. |
Salinization | Firstly, the RMF granules were mixed at 90 °C for 2 h with masses fraction of 0.5%, 1.0%, 2.0%, 3.0%, 4.0%, and 5.0% LaCl3 solution, respectively, at liquid/solid of 3 mL/g in the thermostatic water bath. The samples were then washed by deionized water until the pH value reached 7.0. After that, the obtained granules were dried at 105 °C for 24 h. Finally, the salinization MMF samples were cooled to room temperature for further studies. The salinization MMF samples were named as MMF-La0.5, MMF-La1.0, MMF-La2.0, MMF-La3.0, MMF-La4.0, and MMF-La5.0, respectively. |
Calcination | The RMF granules were calcined at 100, 200, 300, 600, 800, and 1000 °C, respectively, for 2 h. After that, the calcination MMF samples were cooled to room temperature for further studies. The calcination MMF were named as CMMF-100, CMMF-200, CMMF-300, CMMF-600, CMMF-800, and CMMF-1000, respectively. |
Combined modifications | The optimal acidification modification, alkalization modification, salinization modification, and calcination modification methods were calcined at the optimal temperature, respectively. After that, the combined MMF samples were cooled to room temperature for further studies. |
