
"Copper (Cu) foil (25 µm thick, 99.98% metals basis) was purchased from Sigma-Aldrich Co., LLC, Darmstadt, Germany. The graphene was grown on the Cu foil by CVD method using CO2 gas (99.999% purity) as a carbon source, as shown in Figure 1. The growth process was conducted using a customized thermal CVD system integrated with an inductively coupled plasma system (planarGROW-4S, planarTECH LLC, The Woodlands, TX, USA). The distance from the plasma coil to the sample was ~75 cm. Before the Cu foil was loaded into a 4″ horizontal quartz tube of the CVD system, it was washed in ethanol solution for 10 min under ultrasonication and dried in air at room temperature. After the loading of samples, 150 sccm of H2 flowed into the CVD quartz tube while the reactor was heated to 1000 °C at a pressure of 1 Torr. At 1000 °C, the Cu foil surface was treated using H2 plasma generated by rf power for 30 min. The rf power was adjusted from 100 to 400 W in order to investigate the effects of H2 plasma pre-treatment. Next, a mixture of CO2 (50 sccm) and H2 (200 sccm) was applied at a working pressure of 2 Torr for 30 min for graphene growth on Cu foils. After the graphene growth stage, the CVD quartz tube reactor was cooled down to room temperature under an H2 flow of 150 sccm at 1 Torr."
https://pmc.ncbi.nlm.nih.gov/articles/PMC9412882/
I think this could be scaled up and perhaps utilize waste heat to do this process at scale. The copper is reusable in this, and what your left with is pure carbon in a very useful form. It could be a potential hazard if mishandled, but in the worst case scenario you could just dump the graphene out via the airlock.
Could you scrub co2 by making graphene?
byu/Memetic1 inspace

4 Comments
CO2 in air is 0.04%, not 99.999%. Chemical carbon capture is a good idea, but this one makes graphene from CO2, not from air where CO2 is an impurity
The tricky part is extracting enough CO2 from the atmosphere economically. There are plenty of things to do with it once that step is done, so this would just be one more.
I’m pretty sure that’s a MK04 recipe in this game: r/pyanodons
If the concentration of co2 in the atmosphere reaches 99% I guess maybe the robots could consider doing this?
Humans would all be dead before it ever reaches double digits.