Sunlight-activated material turns PFAS in water into harmless fluoride

18 bookofjoe 7 8/10/2025, 4:31:27 PM phys.org ↗

Comments (7)

nraynaud · 1m ago
[delayed]
nick238 · 1h ago
The Materials Science Gameplay Loop:

1. Invent fantastic new material that does a heretofore novel reaction or one with improved performance (chemical, photovoltaic, etc.)

2. Do #1 without lead, cadmium, mercury, or arsenic.

SociallyAwesomeAwkwardPenguinMeme("Turns PFAS to fluoride", "Contains Cadmium")

momoschili · 1h ago
3. Do #2 without platinum, palladium, rhodium, ruthenium to make it economically viable
3eb7988a1663 · 52m ago
Is that much of a problem for a catalyst? Presumably you do not need many of these: at water treatment plants and at the waste-stream for manufacturing processes which emit PFAS. You might not be able to justify the expense inside your home water purification system, but it could still be cost effective for large scale installations.
SoftTalker · 36m ago
Activated carbon filtering removes up to about 75% of PFAS. Reverse-osmosis removes almost all.

Doesn't get rid of them, to be clear. It would still be better if a way could be found to chemically (and cheaply) convert them to something less harmful.

N2yhWNXQN3k9 · 5m ago
> Activated carbon filtering removes up to about 75%

Seems like the limitation must be more than reducing concentrations in fluid? Otherwise you'd just do multiple passes?

tstrimple · 36m ago
Turns it to harmless fluoride? Maybe this is what is needed for the GOP to tackle PFAS. They hate fluoride more than unknown chemicals being dumped into the water supply.
baby_souffle · 34m ago
They won't ban pfas, they'll just ban this particular technique.

Expect RFK Jr to announce an investigation into criminals introducing more brain rotting fluoride to our water supply any day now. (Kidding, but it feels like this could happen and that makes me _sad_)