I’m aware of such proposals. You’d have to leave the fibers out for a really long time without pumped flow. They’d accumulate stuff on them. The concentration achievable is fairly low. The special fibers are expensive. Putting them out and collecting them is expensive. This would all end up being even more expensive than pumping seawater.
Also, amidoximes are susceptible to hydrolysis; many of them would convert to ketones in seawater eventually.
I’m aware of such proposals. You’d have to leave the fibers out for a really long time without pumped flow. They’d accumulate stuff on them. The concentration achievable is fairly low. The special fibers are expensive. Putting them out and collecting them is expensive. This would all end up being even more expensive than pumping seawater.
Also, amidoximes are susceptible to hydrolysis; many of them would convert to ketones in seawater eventually.