Method for preparing nano-sheet manganese silicate composite selective adsorbent from iron tailings
A nano-flaky, composite adsorption technology, applied in the direction of silicon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of no industrial application precedent, no research report on manganese silicate materials, complex mechanism of action, etc., to achieve good results Selective adsorption performance of cationic dyes, abundant reserves and uniform pore size distribution
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Embodiment 1
[0026] Example 1: Disperse 2.0 g of iron tailings powder milled to 200 mesh sieve in 30 mL containing 2.8 g of sodium silicate (0.01 mol), 0.2 g of sodium hydroxide (0.005 mol), 1 mL of ammonia water (concentration of 28 wt. %, 0.015mol) in the mixed alkali solution (total alkali concentration: 1mol / L)), fully stirred (3000r / min, 2h) and ultrasonic (250W, 1h) to form a uniform suspension. Then gradually add 30 mL of an aqueous solution containing 3.7 g of manganese acetate (0.5 mol / L), continue stirring (2500 r / min, 1 h) and ultrasonic (250 W, 30 min) to fully react to form a uniform suspension. Then transfer the suspension into a 100mL polytetrafluoroethylene hydrothermal reaction tank, seal it, and react at 180°C for 12h. After the reaction tank is naturally cooled to room temperature, the product is centrifuged and fully washed, dried, ground, and sieved to obtain a brown amorphous nano-sheet manganese silicate composite adsorbent.
[0027] From Figure 1-6 It can be obta...
Embodiment 2
[0028] Example 2: 2.0g ball milled to the iron tailings powder of 200 mesh sieves and dispersed in 30mL containing 2.8g sodium silicate (0.01mol), 0.4g sodium acetate (0.05mol) mixed alkali solution (total alkali concentration: 0.5mol / L), fully stirred (3500r / min, 2h) and ultrasonic (250W, 45min) to form a uniform suspension. Then gradually add 30 mL of an aqueous solution containing 5.4 g of manganese nitrate (1.0 mol / L), continue to stir (2500 r / min, 1 h) and ultrasonic (250 W, 1 h) to fully react to form a uniform suspension. Then transfer the suspension into a 100mL polytetrafluoroethylene hydrothermal reaction tank, seal it, and react at 200°C for 10h. After the reaction tank is naturally cooled to room temperature, the product is centrifuged and fully washed, dried, ground, and sieved to obtain a brown amorphous nano-sheet manganese silicate composite adsorbent.
[0029] The adsorbent is an amorphous nanosheet structure, the main elements are Mn, Si, O, Na, the main phase...
Embodiment 3
[0030] Example 3: Disperse 3.0 g of iron tailings powder milled to 200 mesh sieve in 30 mL of alkali solution containing 4.3 g of sodium silicate (alkali concentration: 0.5 mol / L), fully stirred (3000 r / min, 2h) and sonication (250W, 1h) to form a homogeneous suspension. Then gradually add 30mL of a mixed solution containing 1.8g of manganese acetate and 1.1g of manganese sulfate (Mn 2+ Concentration is 0.5mol / L), continue to stir (2500r / min, 2h) and ultrasonic (250W, 1.5h) to make it fully react to form a uniform suspension. Then the suspension was transferred into a 100mL polytetrafluoroethylene hydrothermal reaction tank, sealed, and reacted at 160°C for 72h. After the reaction tank is naturally cooled to room temperature, the product is centrifuged and fully washed, dried, ground, and sieved to obtain a brown amorphous nano-sheet manganese silicate composite adsorbent.
[0031] The adsorbent is an amorphous nanosheet structure, the main elements are Mn, Si, O, Mg, the ma...
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