Search for Activated Carbon Powder and you’ll find a good thread on here.
Agree with above that BassBoys is the resident expert - trust what he says in these threads.
You also mentioned zeolite which is not the same as activated charcoal - according to a forum conversation I had with BassBoys it works but not as well as activated charcoal. I have used both and unscientifically agree with BB, but zeolite is a LOT less messy so I tend to use that more often these days.