Preparation method and application of sulfonated porous nano silicon dioxide adsorbent
A nano-silica and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of low adsorption performance, achieve rich pore structure, high specific surface area, and wide application foreground effect
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Embodiment 1
[0029] (1) Add 2g of nano-silica to 150mL of deionized water, add 24g of polyvinylpyrrolidone, heat to 80°C for pretreatment for 2h, add 4g of sodium hydroxide after cooling, perform etching for 1.5h, and centrifuge , washed with deionized water and ethanol, and then placed in a resistance furnace and calcined at 400°C for 2h to obtain porous nano-silica.
[0030] (2) Add 1 g of porous nano-silica and 0.2 g of toluene diisocyanate in parts by weight to 30 mL of toluene solvent, heat to 75 ° C, react for 6 h, centrifuge after the reaction, wash the product with acetone and dry to obtain isocyanate porous nano-silica.
[0031] (3) in the xylene solvent of 40mL, add the isocyanated porous nano silicon dioxide of 1g and the benzhydrin alcohol of 0.5g in the xylene solvent of 40mL, after stirring evenly, add dropwise the catalyst dibutyltin dilaurate of 0.012g, be warming up to 60 °C, reacted for 10 h, centrifuged after the reaction, washed the product with acetone and dried to ob...
Embodiment 2
[0034] (1) Add 2g of nano-silica to 200mL of deionized water, add 27g of polyvinylpyrrolidone, heat to 100°C for pretreatment for 2h, add 4.5g of sodium hydroxide after cooling, etch for 1.5h, centrifuge Separation, washing the product with deionized water and ethanol, and then placing it in a resistance furnace and calcining at 400° C. for 2.5 hours to obtain porous nano silicon dioxide.
[0035] (2) Add 1 g of porous nano-silica and 0.3 g of toluene diisocyanate in parts by weight to 50 mL of toluene solvent, heat to 90 ° C, react for 8 h, centrifuge after the reaction, wash the product with acetone and dry to obtain isocyanate porous nano-silica.
[0036] (3) In the xylene solvent of 60mL, add the isocyanated porous nano silicon dioxide of 1g and the benzhydrin alcohol of 0.8g in the xylene solvent of 60mL, after stirring evenly, add dropwise the catalyst dibutyltin dilaurate of 0.02g, be warming up to 80 °C, reacted for 12 hours, centrifuged after the reaction, washed the...
Embodiment 3
[0039] (1) Add 2g of nano-silica to 250mL of deionized water, add 30g of polyvinylpyrrolidone, heat to 90°C for pretreatment for 4 hours, add 5g of sodium hydroxide after cooling, perform etching for 2 hours, and centrifuge. The product was washed with deionized water and ethanol, then placed in a resistance furnace, and calcined at 450° C. for 2.5 hours to obtain porous nano-silica.
[0040] (2) Add 1 g of porous nano-silica and 0.4 g of toluene diisocyanate in parts by weight to 60 mL of toluene solvent, heat to 80 ° C, react for 8 h, centrifuge after the reaction, wash the product with acetone and dry to obtain isocyanate porous nano-silica.
[0041](3) In the xylene solvent of 100mL, add the isocyanated porous nano silicon dioxide of 1g and the benzhydrin alcohol of 1.2g in the xylene solvent of 100mL, after stirring evenly, add dropwise the catalyst dibutyltin dilaurate of 0.03g, be warming up to 80 °C, reacted for 18 hours, centrifuged after the reaction, washed the pro...
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