Graphene Oxide Freeze-drying Machine

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Graphene Oxide Freeze-drying Machine

The graphene oxide prepared by the freeze-drying machine has a loose and porous morphology and uniform pore distribution, which is convenient for its use as a precursor to prepare graphene and its application in the fields of adsorbents and nanocomposites.

The graphene oxide freeze-drying machine freeze-drying method comprises the following steps:

a. The improved Hummers method is used to prepare graphite oxide, flake graphite or artificial graphite is used as raw material, and graphite oxide is obtained by oxidation intercalation reaction;

b, configure graphite oxide solution with water or ethanol as solvent, add a certain amount of graphite oxide, 40 ± 10 ° C water bath, stir, and make a solution; wherein the mixing ratio of graphite oxide and the solvent is 100ml solvent corresponding graphite oxide The mass range is 0.1-1Og;

C, quick freezing use freeze dryer or liquid nitrogen to be rapidly cooled to -150-20 ℃, and keep low temperature, then put the solution in step b into the freezing cavity, make the solution solidify rapidly and become solid, utilize solvents such as water, ethanol During rapid crystallization and solidification, hydrogen bonds lead to a cold expansion treatment that increases the volume, thereby exfoliating to obtain graphene oxide;

d. Evacuate to make the solvent sublime to ensure that the temperature of the freezing chamber is below 0°C so that the solution is kept in a solidified state; use a vacuum pump to reduce the air pressure in the freezing chamber to 200Pa or lower, so that the solvent is sublimated;

e. The obtained product maintains the low temperature and low-pressure state in step d until the solvent is completely sublimated, the sponge-like graphene oxide can be obtained, and the product is loose and porous. Using different concentrations of graphite oxide solutions, graphene oxide with different porosity can be obtained, the porosity is 20-90%, and the morphological structure of the product is uniformly distributed.

Parameter:

Model	KFD -1	KFD -2	KFD -5	KFD -10	KFD -20
Type	(Conductive Type)
Ice capacity (Kg/batch)	15KG	30KG	75KG	150KG	300KG
Condenser temperature (°C )	< -45 C
Shelf temperature (°C)	-30 ~60 °C
Pre -freezing	(in Original Place)
Shelf area (m2)	1 m2	2 m2	5 m2	10 m2	20 m2
No. of shelves	5+1	6+1	5+1	11+1	14+1
Shelf dimensions (m)	0.5*0.4	1.0*0.4	1.25*0.8	1.2*0.8	1.45*1.0
Shelf spacing (mm)	60	60	70	70	70
Medium	(Silicon Oil)
No. of trays	5pcs	12pcs	30pcs	66pcs	126pcs
Tray dimensions (mm)	400*500	345*495	395*415	395*395	470*325
Refrigerant	R404A
Cooling Method	(Air-cooled) / (Water-cooled)
Final vacuum (Pa)	10Pa
Deforesting method	(Hot water) / (Steam)
Total power (kW)	9kw	13kw	20kw	40kw	50kw
Installation area (m2)	3	6	9	11	15
Chamber dimension(m)	1.2*0.6*1.8	1.5*1.0*1.8	2.5*1.3*2	3.0*1.3*2.5	3.7*2*2.5
Weight (kg)	1500	2000	2500	3800	8500

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