Preparation method of porous iron oxide for heavy metal ion adsorption
A technology of heavy metal ions and iron oxides, applied in the direction of alkali metal oxides/hydroxides, alkali metal compounds, chemical instruments and methods, etc., can solve the problem of unstable iron oxyhydroxide, easy transformation into other phases, and reduced adsorption capacity and other problems, to achieve the effect of convenient operation, good adsorption capacity of heavy metal ions, and improved stability
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Embodiment 1
[0024] Step 1: Disperse ferric oxyhydroxide into 50 mL of 80% ethanol aqueous solution by volume, stir to obtain a uniform suspension, then add ammonia and ethyl orthosilicate, and finally form a mixed solution with a concentration of ferric oxyhydroxide of 0.4 g / L, the concentration of ammonia water was 0.1 mol / L, the concentration of tetraethyl orthosilicate was 0.05 mol / L, stirred at 25°C for 10 hours; centrifuged and washed 3 times with deionized water and absolute ethanol respectively, and the obtained solid Vacuum drying at 50° C. to obtain composite particles with a silicon oxide layer thickness of 50 nm.
[0025] Step 2: Calcining the composite particles obtained in step 1 at 500°C for 4 hours in an air atmosphere to obtain α-Fe with a silicon oxide layer thickness of 50nm 2 o 3 porous structure.
[0026] The α-Fe prepared in this embodiment 2 o 3 The X-ray diffraction spectrum and transmission electron microscope pictures of the porous structure are shown in figu...
Embodiment 2
[0029] Step 1: Disperse ferric oxyhydroxide into 50 mL of 80% ethanol aqueous solution by volume, stir to obtain a uniform suspension, then add ammonia and ethyl orthosilicate, and finally form a mixed solution with a concentration of ferric oxyhydroxide of 0.4 g / L, the concentration of ammonia water was 0.12 mol / L, the concentration of tetraethyl orthosilicate was 0.012 mol / L, stirred at 25°C for 10 hours; centrifuged and washed 3 times with deionized water and absolute ethanol respectively, and the obtained solid Vacuum-dry at 50° C. to obtain composite particles with a silicon oxide layer thickness of 10 nm.
[0030] Step 2: Calcining the composite particles obtained in step 1 at 500°C for 4 hours in an air atmosphere to obtain α-Fe with a silicon oxide layer thickness of about 10 nm 2 o 3 porous structure.
[0031] The α-Fe prepared in this embodiment 2 o 3 The transmission electron microscope pictures of the porous structure are shown in figure 2 (b), in which the t...
Embodiment 3
[0033] Step 1: Disperse ferric oxyhydroxide into 50mL of 60% ethanol aqueous solution by volume, stir to obtain a uniform suspension, then add ammonia water and ethyl orthosilicate, and finally form a mixed solution with a concentration of 0.8% ferric oxyhydroxide g / L, the concentration of ammonia water was 0.1 mol / L, the concentration of tetraethyl orthosilicate was 0.05 mol / L, stirred at 30°C for 20 hours; centrifuged and washed 3 times with deionized water and absolute ethanol respectively, and the obtained solid Vacuum-dried at 50° C. to obtain composite particles with a silicon oxide layer thickness of 30 nm.
[0034] Step 2: Calcining the composite particles obtained in step 1 at 450°C for 8 hours in an air atmosphere to obtain α-Fe with a silicon oxide layer thickness of 30nm 2 o 3 porous structure.
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Abstract
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