What would be a hardy houseplant that gives the most oxygen possible for a small apartment?

I know nothing about plants, except that I tend to kill them, although ivy seems hardy enough to last a while. I’m in a very cramped apartment, and since there is no space for a big plant, I could hang up a plant in a basket. Extra points if you know of such a plant that also produces flowers, not just greenery. I live near Raleigh, NC if that matters. Thanks!