Method for preparing graphene oxide based on high-concentration inorganic saline solution stripping
An inorganic salt solution and high-concentration technology, applied in the direction of inorganic chemistry, chemical instruments and methods, carbon compounds, etc., can solve the problems that hinder the mass production of graphene oxide, waste of water resources and energy, and non-recyclable utilization, etc., to achieve the realization of intercalation Effects of layers and puffing, change destruction, short preparation cycle
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Embodiment 1
[0041]Using sodium perchlorate as the electrolyte, weigh 17.2g of sodium perchlorate and add 5g of water and place it in an oven at 50°C for 30min. After the solution is clear and transparent, use it as electrolyte (concentration: 24.5mol / L) for electrochemical exfoliation of graphite . Add the prepared electrolyte in the electrolytic cell, choose graphite paper as the anode and connect it to the DC power supply, and use the platinum sheet as the cathode to connect it to the DC power supply. The distance between the two electrodes is 5 cm, and a DC voltage of 5 V is applied. Chemical peel reaction. After continuing for 30 hours, the electrode did not peel off, and graphene oxide aggregates were obtained. The actual figure is as follows figure 1 shown. After suction filtration and washing, disperse in an 80W ultrasonic cleaning machine for 30 minutes to obtain a two-dimensional sheet graphene oxide dispersion, and dry the dispersion at -20°C at 20 Pa for 72 hours to prepare g...
Embodiment 2
[0044] Using sodium perchlorate as the electrolyte, weigh 15g of sodium perchlorate and add 5g of water and place it in a 50°C oven for 30min. After the solution is clear and transparent, use it as the electrolyte (concentration: 21.4mol / L) for electrochemical exfoliation of graphite. Add the prepared electrolyte in the electrolytic cell, choose graphite paper as the anode and connect it to the DC power supply, and use platinum wire as the cathode to connect it to the DC power supply. The distance between the two electrodes is 6cm, and a 10V DC voltage is applied to conduct electrolysis at 15°C. Chemical peel reaction. After 10 hours, the electrodes did not peel off, and graphene oxide aggregates were obtained. After vacuum filtration and washing, they were dispersed in a 100W ultrasonic cleaner for 1 hour to obtain a two-dimensional sheet of graphene oxide dispersion. The dispersion was stored at -30°C Graphene oxide powder was prepared by drying under vacuum at 20 Pa for 24 ...
Embodiment 3
[0047] Using sodium perchlorate as the electrolyte, weigh 5g of sodium perchlorate and add 5g of water and place it in an oven at 50°C for 30min. After the solution is clear and transparent, use it as electrolyte (concentration: 7.1mol / L) for electrochemical exfoliation of graphite. Add the prepared electrolyte solution into the electrolytic cell, choose graphite paper as the anode and connect it to the DC power supply, and use platinum wire as the cathode to connect it to the DC power supply. The distance between the two electrodes is 10cm, and a voltage of 15V is applied, and the electrochemistry is carried out at 35°C. Stripping reaction. The electrode did not peel off for 1 hour, and graphene oxide aggregates were obtained. After vacuum filtration and cleaning, they were dispersed in a 150W ultrasonic cleaner for 2 hours to obtain a two-dimensional sheet of graphene oxide dispersion. The dispersion was vacuumed at -40°C Dry at 20Pa for 36h to prepare graphene oxide powder....
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