Preparation method of graphene-modified composite mesoporous carbon microsphere air purifier
An air purifier and mesoporous carbon technology, which is used in the field of air purification to achieve the effect of reducing dispersion
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Embodiment 1
[0046] The invention provides a method for preparing a composite mesoporous carbon microsphere air purifier, comprising the following steps:
[0047] Step 1) Synthesis of graphene oxide (GO): Graphene oxide was prepared by the modified Hummers method. Using graphite flakes as raw materials and concentrated H2SO4 and KMnO4 as oxidants, graphite oxide is prepared first by a two-step method, and then graphene oxide is prepared by ultrasonic dispersion. Characterized by means of XRD, TEM, SEM, etc., to obtain graphene oxide with a single-layer or few-layer structure, and ensure that its surface contains a large number of oxygen-containing groups such as -OH, -COOH, C-O-C, and C=O. The dispersion of graphene oxide in aqueous solution provides a large number of active sites for the preparation of graphene-based titania nanocomposites in the later stage.
[0048] Assemble a 250mL three-necked flask in an ice-water bath, add 23mL of concentrated sulfuric acid, add a solid mixture of ...
Embodiment 2
[0066] On the basis of the foregoing embodiments, this embodiment provides a method for preparing a composite mesoporous carbon microsphere air purifier, comprising the following steps:
[0067] Step 1) Synthesis of Graphene Oxide (GO)
[0068] Assemble a 250mL three-neck flask in an ice-water bath, add 40mL of concentrated sulfuric acid, add a solid mixture of 1 g of graphite powder and 1 g of sodium nitrate under stirring, then slowly add 5 g of potassium permanganate, and control the reaction temperature not to exceed 10 °C. After stirring and reacting for 40 min, raise the temperature to about 50°C, continue stirring for 3 h, then slowly add 60 mL of deionized water, continue stirring for 30 min, then raise the temperature to 90°C, and add 5 mL (mass fraction 30%) of hydrogen peroxide to reduce the residual After the reaction solution turns bright yellow, filter it while it is hot, and wash it with 5% HCl solution and deionized water until the pH of the filtrate is 6.7, wh...
Embodiment 3
[0081] On the basis of the foregoing embodiments, this embodiment provides a method for preparing a composite mesoporous carbon microsphere air purifier, comprising the following steps:
[0082] Step 1) Synthesis of Graphene Oxide (GO)
[0083] Assemble a 250mL three-necked flask in an ice-water bath, add 50mL of concentrated sulfuric acid, add a solid mixture of 1.5g of graphite powder and 1.5g of sodium nitrate under stirring, then slowly add 7g of potassium permanganate, and control the reaction temperature not to exceed 10°C. After stirring and reacting for 60 minutes, raise the temperature to about 50°C, continue stirring for 4 hours, then slowly add 80 mL of deionized water, continue stirring for 40 minutes, then raise the temperature to 90°C, and add 5 mL (mass fraction 30%) of hydrogen peroxide to reduce the remaining Oxidant, after the reaction solution turns bright yellow, filter it while it is hot, and wash it with 5% HCl solution and deionized water until the pH of...
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