Silver-activated carbon composite material and preparation method thereof
A composite material and activated carbon technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problem of unsatisfactory formaldehyde removal effect, save filter material preparation costs, simplify filter material preparation steps, and reduce operational hazards low effect
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[0022] In a typical implementation of the present application, a method for preparing a silver-activated carbon composite material is provided, the preparation method comprising: step S1, mixing the silver salt solution and activated carbon for impregnation and reduction treatment to obtain a suspension; step S2 , carry out gradient drying on the suspension to obtain silver-activated carbon composite materials, the temperature of gradient drying is between 40-120°C, the total time is 1-24h, gradient drying includes multiple drying sections, and the drying temperature of each drying section gradually increases high.
[0023] In the process of preparing the silver-activated carbon composite material, the present invention adopts a gradient drying method, keeps a certain time at a lower temperature for the first gradient drying treatment, and then gradually raises the temperature for drying. The problem of unstable load caused by long-term low-temperature drying and negative impa...
Embodiment 1
[0037] 1) Weigh 0.02g of silver nitrate, dissolve it in 50mL of deionized water, shading and stirring to dissolve, after the dissolution is completed, add 1g of activated carbon and continue to stir, stir at a stirring rate of 500r / min for 30min, stop stirring and let stand for 60min.
[0038] 2) Suction filter and wash the suspension obtained above to obtain a solid precipitate, and then dry the obtained solid precipitate, which is the activated carbon filter material, using a gradient drying method. The specific process is: 60 ° C for 2 hours →Dry at 80°C for 2h→Dry at 100°C for 2h. After drying, cool to room temperature and seal and store to obtain a silver-activated carbon composite catalyst.
Embodiment 2
[0040] The difference from Example 1 is that the specific drying process is: drying at 80°C for 0.5h→drying at 120°C for 0.5h.
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