A question about masks. The impression I've had is that they are disposable, that they can't be dis-infected. I sort of understand why immersion in dis-infecting liquids could affect the integrity of the fabric, but is there a reason why UV dis-infection wouldn't work?
It depends.
The cotton and similar could easily be washed, but those masks they are not that effective.
Allegedly some surgical masks can be disinfected by boiling for 3 min without significant damage but I have yet to see this confirmed. Probably you could leave them for days without touching them and the virus will die, even sooner if they get some sun.
For N95 they are coming with several options because of the current shortage. CDC said that 30 min at 70 degrees C will be good enough. Some use hydrogen peroxide vapors. Others (and my hospital I think it’s going with this) will use ethylene oxide gas, commonly used for medical devices.