Sunlight-activated material turns PFAS in water into harmless fluoride

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")

Ignoring the cadmium problem, is fluoride really harmless? I don't know what concentration of fluoride you'd end up with from converting typical PFAS pollution, but if you get enough fluoride it is acutely poisonous, which might be worse than the carcinogenic PFAS. (Likewise, it might be worse for the environment)

Fluoride?!!

Isn't that supposed to be some kind of demonic juice?

Why else is the government so intent on making sure that there's none in our water? I'm sure that they would much rather have the PFAS, produced by their nice, generous, industrialist bros.

I'm a bit confused, are they suggesting that a cadnium coumpound to treat PFAS is a done deal?

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