Graphene oxide surface molecularly imprinted composite material for tracking polycarboxylate water reducer and its preparation method
A technology of graphene surface and polycarboxylate system, which is applied in the field of molecularly imprinted composite materials on the surface of graphene oxide and its preparation, can solve problems such as hindering the application of graphene oxide and low dispersion of graphene oxide, and achieve crack resistance and Effects of durability, improvement of low dispersion, improvement of compressive strength and flexural strength
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Embodiment 1
[0024] Step 1: Preparation of graphene oxide lamellar dispersion
[0025] Add 2 parts of graphite powder and 50 parts of concentrated sulfuric acid into the three-necked flask in sequence. Control the temperature of the system at 3°C, slowly add 2 parts of sodium nitrate and 8 parts of potassium permanganate within 1 hour, and continue the reaction for 2 hours. Raise the temperature to 35°C and react at medium temperature for 6 hours, slowly add 100 parts of deionized water dropwise for 30 minutes. Then raise the temperature to 85°C, after 40 minutes of high-temperature reaction, slowly add 150 parts of deionized water dropwise for 30 minutes, when the temperature of the system drops to 50°C, add 1.8 parts of hydrogen peroxide with a mass fraction of 30% to make the solution turn yellow, and use Wash with ionized water until the solution is neutral, and ultrasonically disperse the mixed solution for 40 minutes to obtain a graphene oxide sheet dispersion.
[0026] Step 2: Pre...
Embodiment 2
[0029] Step 1: Preparation of graphene oxide lamellar dispersion
[0030] Add 4 parts of graphite powder and 100 parts of concentrated sulfuric acid into the three-necked flask successively. Control the temperature of the system at 4°C, slowly add 4 parts of sodium nitrate and 16 parts of potassium permanganate within 1 hour, and continue the reaction for 3 hours. Raise the temperature to 35°C and react at medium temperature for 7 hours, slowly add 180 parts of deionized water dropwise for 50 minutes. Then raise the temperature to 85°C, after high temperature reaction for 40 minutes, slowly add 180 parts of deionized water dropwise for 50 minutes, when the system temperature drops to 60°C, add 4 parts of hydrogen peroxide with a mass fraction of 30% to make the solution turn yellow, use Wash with ionized water until the solution is neutral, and ultrasonically disperse the mixed solution for 80 minutes to obtain a graphene oxide sheet dispersion.
[0031] Step 2: Preparation ...
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