Spherical SiO2-based adsorbent adopting core-shell structure as well as preparation method and application of adsorbent
A technology of spherical silica and shell structure, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve problems such as dye pollution, achieve low cost, and solve treatment problems , The effect of simple process
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Embodiment 1
[0024] Weigh 82g MgCl 2 ·6H 2 O was dissolved in 100mL deionized water, and after adding 3g of cetyltrimethylammonium bromide (CTAB), mechanically stirred for ten minutes to obtain the modified MgCl 2 Aqueous solution; at the same time, disperse 5g of silica microspheres in 100mL aqueous solution and add 20g of triethanolamine to obtain modified SiO 2 Dispersions. Under stirring, the modified SiO 2 The dispersion was added to the modified MgCl 2 In aqueous solution, SiO 2 / MgCl 2 Mixture. Subsequently, 50 mL of ammonia water with a concentration of 25 wt% was added dropwise to the SiO 2 / MgCl 2 In the mixed solution, the reaction was stopped after stirring in a water bath at 45° C. for 2 h. Suction filtration and washing, drying at 120°C, and calcining the dried powder in a muffle furnace at 500°C for 3 hours to obtain a spherical silica-based core-shell structure adsorbent in the form of black solid powder.
Embodiment 2
[0026] Weigh 82g MgCl 2 ·6H 2 O was dissolved in 100mL deionized water, and after adding 3g of cetyltrimethylammonium bromide (CTAB), mechanically stirred for ten minutes to obtain the modified MgCl 2 Aqueous solution; at the same time, disperse 10g of silica microspheres in 100mL aqueous solution and add 20g of triethanolamine to obtain modified SiO 2 Dispersions. Under stirring, the modified SiO 2 The dispersion was added to the modified MgCl 2 In aqueous solution, SiO 2 / MgCl 2 Mixture. Subsequently, 50 mL of ammonia water with a concentration of 26 wt% was added dropwise to the SiO 2 / MgCl 2 In the mixed solution, the reaction was stopped after stirring in a water bath at 45° C. for 2 h. Suction filtration and washing, drying at 120°C, and calcining the dried powder in a muffle furnace at 550°C for 3 hours to obtain a spherical silica-based core-shell structure adsorbent in the form of black solid powder.
Embodiment 3
[0028] Weigh 82g MgCl 2 ·6H 2 O was dissolved in 100mL deionized water, and after adding 3g of cetyltrimethylammonium bromide (CTAB), mechanically stirred for ten minutes to obtain the modified MgCl 2 aqueous solution; at the same time, 5 g of silica microspheres were dispersed in 100 mL of aqueous solution and 20 g of triethanolamine was added to obtain modified SiO 2 Dispersions. Under stirring, the modified SiO 2 The dispersion was added to the modified MgCl 2 In aqueous solution, SiO 2 / MgCl 2 Mixture. Subsequently, 50 mL of ammonia water with a concentration of 28 wt% was added dropwise to the SiO 2 / MgCl 2 In the mixed solution, the reaction was stopped after stirring in a water bath at 45° C. for 2 h. Suction filtration and washing, drying at 120°C, and calcining the dried powder in a muffle furnace at 600°C for 3 hours to obtain a spherical silica-based core-shell structure adsorbent in the form of black solid powder.
[0029] After multiple analyzes, the pre...
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