Compound grapheme absorption agent, method for preparing compound grapheme absorption agent and application of compound grapheme absorption agent
A technology of graphene and adsorbent, which is applied in the field of composite graphene adsorbent and its preparation, can solve the problems of restricting the application of pollutant removal, reducing the specific surface area of graphene, and less application of graphene materials, so as to improve the dispersion and The effect of hydrophilicity, low cost of treatment process, and easy control of conditions
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[0041] Example 1
[0042] The preparation method of the composite graphene adsorbent of this embodiment includes the following steps:
[0043] (1) Disperse graphene oxide in water, and obtain a graphene oxide suspension with a concentration of 4mg / mL after 30 minutes of ultrasonic dispersion;
[0044] The graphene oxide in this example was synthesized by the modified Hummers method. The specific steps are as follows: slowly add 10g graphite and 5g sodium nitrate into a flask containing 230ml concentrated sulfuric acid, and stir in a mixture of ice and water. After 30 minutes, slowly add 30g Potassium permanganate, during the stirring process, control the reaction temperature to always be less than 15°C and keep it for 90min; transfer the reaction system to a constant temperature water bath at 35°C, keep the reaction temperature at 35°C, and stir for 30min; add 460mL to the reaction system Deionized water, the reaction temperature is controlled at 80℃~95℃, the stirring time is 30min;...
Example Embodiment
[0053] Example 2
[0054] The preparation method of the composite graphene adsorbent of this embodiment includes the following steps:
[0055] (1) Disperse graphene oxide in water, and obtain a graphene oxide suspension with a concentration of 6 mg / mL after 60 minutes of ultrasonic dispersion;
[0056] (2) Add nano zero-valent iron and cetyl trimethyl ammonium bromide to the graphene oxide suspension obtained in step (1); among them, nano zero-valent iron, graphene oxide and cetyl trimethyl ammonium bromide The mass ratio of base ammonium bromide is 1:2:9, fully stirred, react at 50°C for 5 hours, and obtain a reaction solution after complete reaction;
[0057] (3) Heat the reaction solution obtained in step (2) to 85°C, add the reducing agent potassium borohydride, and obtain a black flocculent precipitate after full reaction; the quality of the reducing agent is 9 times that of the graphene oxide;
[0058] (4) The black flocculent precipitate obtained after step (3) is suction filter...
Example Embodiment
[0060] Example 3
[0061] The preparation method of the composite graphene adsorbent of this embodiment includes the following steps:
[0062] (1) Disperse graphene oxide in water, and obtain a graphene oxide suspension with a concentration of 5 mg / mL after 40 minutes of ultrasonic dispersion;
[0063] (2) Add nano zero-valent iron and cetyl trimethyl ammonium bromide to the graphene oxide suspension obtained in step (1); among them, nano zero-valent iron, graphene oxide and cetyl trimethyl ammonium bromide The mass ratio of ammonium bromide is 1:2:8, fully stirred, and reacted at 52°C for 4 hours, and the reaction solution is obtained after complete reaction;
[0064] (3) Heat the reaction solution obtained in step (2) to 82°C, add the reducing agent sodium borohydride, and obtain a black flocculent precipitate after full reaction; the total mass of the reducing agent is 11 times the mass of graphene oxide;
[0065] (4) The black flocculent precipitate obtained after step (3) is sucti...
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