A method for preparing functionalized graphene based on ion exchange
An ion exchange and fossil technology, which is applied in the chemical characteristics of fibers, chemical post-processing of rayon, textiles and papermaking, etc., can solve the problem of limiting the synergistic interaction between graphene nanosheets and electrochemically active materials, and improve the uneven adsorption. phenomenon, realize functionalization, avoid the effect of agglomeration
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Embodiment 1
[0026] Preparation of graphene oxide: under an ice bath, disperse 2 g of graphite powder into 100 mL of concentrated sulfuric acid with a mass fraction of 98%, slowly add 10-12 g of potassium permanganate under stirring, and stir for ~1 hour at 30 °C. Then slowly add 160 mL of deionized water dropwise, heat and stir in an oil bath at 90°C for 30 minutes to 1 hour, add 400 mL of deionized water, and finally add 12-15 mL of H with a mass concentration of 30%. 2 O 2 , stirred for 30 minutes, and repeatedly washed with a mass concentration of ~5% HCl solution and deionized water to obtain colloidal graphene oxide.
[0027] serial number Graphite powder (g) 98% concentrated sulfuric acid ml Potassium permanganate (g) First add deionized water ml The second addition of deionized water ml H 2 O 2 ml
Embodiment 2
[0029] Preparation of graphene fibers: First, through the wet spinning method, 16-30 mg / mL GO aqueous solution was injected into the coagulation bath by a syringe pump (the injection rate of the syringe pump was 10-30 μL / min), and the coagulation bath was made of potassium hydroxide. of saturated ethanol solution to prepare graphene oxide fibers. In a muffle furnace, in the mixed gas environment of argon and hydrogen, the temperature is increased at a rate of 2-10°C / min, and the graphene oxide fibers are reduced at 400°C-800°C for 2-4 hours to obtain graphite with better conductivity. olefin fibers;
[0030] Scanning electron microscope is used to observe the microscopic morphology of the product of this embodiment, and the results are as follows image 3 Shown is a partial enlarged view of graphene fibers reduced at 800 °C for 2 hours;
Embodiment 3
[0032] Preparation of Cu / rGO fibers: As shown in Example 2, graphene oxide fibers were first prepared, and then immersed in 1-5wt% Cu(NO 3 ) 2 In an ethanol aqueous solution for 30 minutes to 3 hours, the volume ratio of ethanol to water is 2:1, and the soaked fibers are naturally dried, and finally heated at a rate of 2-10°C / min under the condition of a mixed gas of argon and hydrogen. Cu / rGO fibers were obtained by reduction at 800-1000 °C for 2-4 hours.
[0033] serial number Cu(NO 3 ) 2 Quality Score (%)
[0034] Scanning electron microscope is used to observe the microscopic morphology of the product of this embodiment, and the results are as follows Figure 4 , 5, Cu nanoparticles were successfully distributed on the graphene fibers, and the XPS test was performed on them, and the results were as follows Image 6 It is further proved that the product is Cu / rGO fiber;
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