Fig. 1. Schematic diagram of the silicate adsorption reaction by hydrotalcite.
Fig. 2. Effect of calcination of HTC on the loading of Si(IV) in several NaOH concentrations. ([NaOH] = 2-6 M; [Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; [calcined HTC] = [uncalcined HTC] = 0.35 g/L)
Fig. 3. Effect of calcined HTC concentration on the loading percentage of Al(III) and Si(IV).([NaOH] = 1.67 M; [Aqueous] = Al(III) 4.3 g/L, Si(II) 0.05 g/L; [calcined HTC] = 0.05-6 g/L)
Fig. 4. Effect of calcined HTC concentration on the loading percentage of Al(III) and Si(IV). ([NaOH] = 0.83 M; [Aqueous] = Al(III) 2.2 g/L, Si(II) 0.025 g/L; [calcined HTC] = 0.05-6 g/L)
Fig. 5. Effect of calcined HTC and NaOH concentration on the loading percentage of Al(III) and Si(IV). ([NaOH] = 5 M; [Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; ■ : diluted 3T, □ : diluted 6T, ● : diluted 12T, ○ : diluted 24T, ◆ : diluted 48T; [calcined HTC] = 0.05-6 g/L)
Fig. 6. Adsorption amounts of Si(IV) on calcined hydrotalcite according to calcined HTC concentration and dilution. ([Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; ■ : diluted 3T, □ : diluted 6T, ● : diluted 12T, ○ : diluted 24T, ◆ : diluted 48T; [calcined HTC] = 0.05- 6 g/L)
Fig. 7. Effect of calcined HTC concentration on solution pH. ([NaOH] = 1.67 M; [Aqueous] = Al(III) 4.3 g/L, Si(II) 0.05 g/L; [calcined HTC] = 0.05-6 g/L)
Fig. 8. Effect of calcined HTC concentration on solution pH. ([NaOH] = 5 M; [Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; ■ : diluted 3T, □ : diluted 6T, ● : diluted 12T, ○ : diluted 24T, ◆ : diluted 48T; [calcined HTC] = 0.05-6 g/L)
Fig. 9. Plots of linearized Freundlich adsorption isotherm for the loading of Si(IV) onto calcined HTC. ([NaOH] = 5 M; [Aqueous] = Al(III) 13 g/L, Si(II) 0.15 g/L; ■ : diluted 3T, □ : diluted 6T, ● : diluted 12T, ○ : diluted 24T, ◆ : diluted 48T; [calcined HTC] = 0.05- 6 g/L)
Table 1. Variation of chemical composition of the solution with dilution
Table 2. Freundlich isotherm data for the adsorption of silica(IV) using calcined HTC
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