Porous graphene-based magnetic carbon block and preparation method and application thereof
A porous graphene and magnetic technology, applied in applications, can solve the problems of small specific surface area of materials, unsatisfactory adsorption performance, unsuitable for sewage treatment, etc., and achieve the effect of excellent adsorption performance, outstanding adsorption effect, and beneficial to recycling.
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[0029] Example 1
[0030] The main steps of the preparation method of porous graphene-based magnetic carbon block are as follows:
[0031] (1) Dissolve 50mg of graphite oxide in 25g of ethanol (the mass ratio of graphite oxide to ethanol solvent is 1:500), disperse uniformly by ultrasonic, then add 15mg of polyvinylpyrrolidone and mix well to obtain a mixture of graphite oxide and surfactant mixture;
[0032] (2) Add 0.5g of cobalt chloride (the mass ratio of cobalt chloride to ethanol solvent is 1:50) and 0.8g of fructose to the mixed solution obtained in step (1), and stir for 1h at 45℃ and 120r / min. Evenly, get the precursor solution;
[0033] (3) Pour the precursor solution obtained in step (2) into the reaction kettle, and hydrothermally react at 175°C for 7 hours. The resulting product is washed with water and lyophilized (freeze-dried under the condition of a vacuum of 5Pa, and the lyophilization temperature is -65 ℃, freeze-drying time is 30h), and then heat treatment in arg...
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[0035] Example 2
[0036] This embodiment is different from embodiment 1 in that: the solvent in step (1) is water, and other conditions are the same as in embodiment 1.
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[0037] Example 3
[0038] This embodiment is different from Embodiment 2 in that: the surfactant in step (1) is cetyltrimethylammonium bromide, and other conditions are the same as in Embodiment 2.
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