Pure silica zeolite-based nano-silver composite material, preparation method and catalytic application thereof
A composite material and nano-silver technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as low catalytic efficiency of catalytic materials, difficult wastewater treatment requirements, complex production processes, etc. Achieve high-efficiency catalytic reduction effect, stable structure and properties, and good dispersion
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Embodiment 1
[0026] Preparation of pure silicalite substrate: Accurately weigh 14.0820g of tetrabutylammonium hydroxide (TEOS) into a 100mL polypropylene plastic bottle, then weigh 8.4227g of deionized water and add to 20.7640g of tetrabutylammonium hydroxide (TBAOH) A mixed solution was obtained in the mixed solution, and the concentration of TBAOH in the mixed solution was 71.14wt%. The above mixed solution was added dropwise into TEOS with a dropping funnel, the magnetic stirring speed was maintained at 750r / min, the dropping rate was per drop / 3s, and the ambient temperature was 25°C. After the mixed solution was dropped, keep the room temperature and rotational speed unchanged, stir for 24 hours, then transfer all the above solution into a 100mL polytetrafluoroethylene hydrothermal reactor, and heat it statically at 115°C for 24 hours. Finally, after centrifugation at 12000rmp and washing with water three times, vacuum drying at 45°C for 12h, and then burning in a muffle furnace at 460...
Embodiment 2
[0029] Composite of pure silicalite and nano-silver: Weigh 0.2g of PSZN powder, 1g of PVP powder and 35mL of deionized powder into a 100mL three-necked flask for ultrasonic dispersion and place at room temperature. Then take 0.001mol of silver nitrate powder and add them to 10mL of deionized water, then add about 6 drops of ammonia water until the formed gray precipitate just disappears. Pour the newly prepared silver ammonium solution into the above-mentioned three-neck flask completely, and after removing the nitrogen for 1 hour, raise the temperature to 70°C and heat and stir at 200r / min for 7 hours under the protection of a nitrogen atmosphere. After centrifugation at 10,000rmp, washing and dispersion three times, and vacuum drying at 50°C for 24 hours, the silver-based functional composite material with uniform small particle size distribution can be collected, named PSZN-0.1Ag.
Embodiment 3
[0031] Composite of pure silicalite and nano-silver: Weigh 0.2g of PSZN powder, 1g of PVP powder and 35mL of deionized powder into a 100mL three-necked flask for ultrasonic dispersion and place at room temperature. Then take 0.003mol of silver nitrate powder and add them into 10mL of deionized water, then add about 6 drops of ammonia water until the formed gray precipitate just disappears. Pour the newly prepared silver ammonium solution into the above-mentioned three-neck flask completely, and after removing the nitrogen for 1 hour, raise the temperature to 70°C and heat and stir at 200r / min for 7 hours under the protection of a nitrogen atmosphere. After centrifugation at 10,000rmp, washing with water and dispersion three times, and vacuum drying at 50°C for 24 hours, the silver-based functional composite material with uniform small particle size distribution can be collected, named PSZN-0.3Ag.
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